AudioTX STL-IP
Contents
1. There are currently two applications that form part of the Toolbox AudioTX STL IP LevelView This application allows you to remotely monitor the input and output audio levels on an STL IP device It also shows the current status of the front panel LED indicators Power TX and RX OK AudioTlX STL IP PDetect This application scans your entire network and shows a list of all connected STL IP devices It also shows network information for each device and the current status Note that this utility shows ALL STL IP devices even if they are not correctly configured within your subnet so it can be used to discover the network settings of an STL IP unit if necessary Double clicking on any STL IP in the list automatically opens up the LevelView application for live audio status information from that device Additional information on the Toolbox for network administrators e The LevelView application makes a TCP IP connection on port 8999 to receive live audio level and status information from the connected STL IP unit e The IPDetect application uses multicast networking so that it can communicate with any STL IP device regardless of the structure of your network It uses the multicast group IP Address 239 255 255 255 and ports 8997 to 8998 If multicast networking is not available on your network a cross over type network cable can be used between an STL IP unit and a PC to use PDetect to discover network settings ee Product2. BROADCAST Audios X STL IP IP Network Audio Device for Live audio over IP Networks and the Internet User Manual amp Reference Guide Firmware revision 1 2b September 2005 WARNING This device MUST be earthed A standard 3 pin IEC power connector should be used for mains connection including an earth connection This earth is connected to the chassis metalwork A 3amp fuse should be fitted in the mains plug or alternatively suitable protection should be installed in the mains circuit supplying the unit The unit should not be opened or serviced except by appropriately qualified personnel To reduce the risk of electric shock Do not Insert objects into the chassis ventilation holes or any other device apertures Do not expose the unit to rain or moisture The ventilation holes on the sides of the chassis and the two fan outlets on the rear must allow for free air flow and must not be obscured Product Manual amp Reference Guide v1 2b Page 2 of 37 CONTENTS Page Introduction 5 Description of controls indicators and connectors 6 Front Panel 5 Rear Panel 5 How to use the Web Browser based user interface 7 Menus amp Settings 8 Built in Help amp Manual 8 Quick Start Guide 9 setup the STL IP system on your network 9 Make a test connection with a single STL IP unit 11 Connections Main Menu setting up audio connections 13 Guide to Connection and Audio types 13 Status view and conf
3. Shows the speed of the Ethernet link interface The status of the RX channel For an explanation of these Mbps 100Mbps Fast Ethernet recommended values see the TX channel status section above When no network has been detected or the network is down the value will be zero OID 1 9 6 1 4 1 22861 1 1 2 6 1 Trap event Yes OID 1 3 6 1 4 1 22861 1 1 2 1 Access read only Trap event Yes Values idle O connecting 15 listening 16 Access read only connected 20 active 30 Value Interface speed in Mbps RX status OK Network interface type The status of the receiver also shown by the RX led Shows the type of Ethernet link full half duplex on the front panel detected by the network interface Full Duplex links should always be used where possible OID 1 9 6 1 4 1 22861 1 1 2 7 Trap event Yes OID 1 3 6 1 4 1 22861 1 1 2 2 Access read only Trap event Yes Values ok 0 problem 1 Access read only Values half duplex 0 full duplex 1 TX status OK The status of the transmitters also shown by the TX Network collisions led on the front panel The number of Ethernet packet collisions detected by the network interface since the OID l 1 3 6 1 4 1 22861 1 1 2 8 device was switched on On a full duplex network p ai a d only link this value should be zero ice ok 0 problem 1 OID 1 3 6 1 4 1 22861 1 1 2 3 Trap event No Ancillary data RX status Access read only The status of the ancillary data receiver problem
4. TTL and Error oo ee Correction settings unchanged Address 10001 Samplerate 40000m V Port number 6800 Samplesize 16 bits TIL 4o Device mode Stereo w In the right column you Error Correction Notused v Block Size j 1ms v should see the settings in the picture If not choose PCM 48000 Hz 16 bits Stereo Total bandwidth 1856 0 kbps Ims Click on the Back button to return to the Status Sub Menu option Pe Product Manual amp Reference Guide v1 2b Page 11 of 37 Click on the red button On the RX screen that appears select UDP The settings expand to show LS se Etta all configuration options for a TCP outgoing UDP connection as in the TCF fincorine next step UDP Multicast You should see the settings in the picture If not choose Port number 8800 Jitter buffer 0 Click on the Back button to return to the Status Sub Menu option Click on the Start Sub Menu option to start the connection The status for both TX 0 and RX changes to ACTIVE The TX and RX indicators on the front of the unit become green Audio is now being looped by the device and you should be able to hear the audio connected to the device s analogue inputs on both the analogue and digital outputs When you have finished testing click the Stop Sub Menu button to stop the connection Tip We recommend that you now install the Audio TX STL IP Toolbox softwa
5. wordclock input If possible use the same audio clock frequency here as you are using for your transmit receive connections for best performance and quality You also select here whether to use the analogue or digital audio input the output of the device will always be sent to both analogue and digital outputs and you can apply gain attenuation to the analogue input and or attenuation to the analogue output To view input and output audio levels a Windows The default analogue audio setup with no input or output gain software application can be attenuation applied uses a nominal of 18dB i e a OdB downloaded and installed analogue signal connected to the analogue inputs 6002 on your PC from the impedance corresponds to 18dbFS digital full scale and so Toolbox menu allows for up to 18dB of signal headroom over OdB analogue Note The Input Output Silence Detectors are also configured on the Audio Seitings page This is discussed later on in the manual in the Advanced Operation section ee Product Manual amp Reference Guide _v1 2b Page 19 of 37 Ancillary Data Settings In this Sub Menu you can enable disable the transmission reception of ancillary RS 232 data Port speed alongside audio and set Max data speed interface parameters Ancillary Data Interface Setup Ancillary data is explained Ga F low contol in more detail in the Eits per byte Advanced Operation ar i chapter which f
6. Menu Selections Status Txo Connection TCP out 223 0 0 225 Port 8800 SEDATI Audio info PCM 24 96000 Hz Stereo 1 ms 5024 kbps Status IDLE O wi At the very bottom of the page the rectangular box shows quick help messages Positioning your mouse pointer over one of the quick help buttons shows information on that settings configuration item for example positioning your mouse over the a button by the TX 0 selection shows Seeman Source Audio received on TX 0 me RX Status IDLE Copyright MMIY MDOUK Each row shows the settings of one of the TX channels To change the settings for a channel please click the name of the channel in the green box Tip Note that the STL IP user manual is also stored electronically in the device you can get this manual simply by clicking on the Manual Main Menu item shown only when the device is Idle The manual sections that follow describe in more detail how to configure and use your STL IP device explaining each Main and Sub Menu item in detail ee Product Manual amp Reference Guide v1 2b Page 8 of 37 QUICK START GUIDE Although you will probably want to read this manual in full the following few steps will get your STL IP device up and running and will allow you to make a test connection To test and familiarise yourself with AudioTX STL IP we recommend that you connect two STL IP devices to your local network LAN or to a single net
7. browser based control interface using the new IP address you have chosen for example enter http 1 2 3 4 into the address bar of your web browser if you have set your STL IP set to use 1 2 3 4 as its IP address Note Only when you reconnect to the Web Control Interface from your browser are the changes to your network settings permanently committed So if for some reason you have entered incorrect network settings and so cannot reconnect power cycling the unit will restore the previous settings Tip If you now need to setup another new STL IP device first start an MS DOS window Command Prompt and type arp d 10 0 0 10 Make atest connection with a single STL IP unit This section will show you how to make a simple test connection using a single STL IP system which will loop back the audio so audio connected to the analogue audio inputs of your device will appear on both the analogue and digital outputs of your device when you make the connection as described Click on the Connections Main Menu Item and then click on the oe green button On the TX 0 screen that appears E select UDP TxD The settings expand to show Disabled all configuration options fora TCP outgoing UDP connection as in the SEIS TCE fincomin next step Multicast In the left column enter the IP i Connections Setu Maintenance Logou a E testing in the Address box Leave the Port number
8. delay but also generates the highest network overhead each block of audio is sent as an individual network packet Increasing the blocksize to say 4ms adds approximately this time to the delay So for example PCM audio has a 5ms delay as standard using a 4ms blocksize makes the total delay about 9ms Not shown for MPEG audio types where the block size is fixed to the MPEG frame size 24ms for 48kHz audio For LB 1 audio types delay shown includes the minimum blocksize of 20ms 16kHz sample rate and 13ms 24kHz sample rate Network Bitrates The Network bitrate required for audio transmission is a cee gata 1936 0 kbps combination of several factors Each of the factors is Ancillary data 0 0 kbps shown in the table at the bottom of the TX 0 to TX 5 Error correction U0 kbps settings and the summary is shown on the status page Network overhead 80 0 kbps under each of the TX 0 to TX 5 buttons Total bandwidth 1616 0 kbps Audio data The network bandwidth selected for your audio data Ancillary data The extra bandwidth reserved for transmission of ancillary data from the RS 232 serial interface port see manual section on Ancillary Data Settings later Error correction Bandwidth used by your selected FEC 50 or FEC 100 error correction Network overhead Network overhead for audio data packets TCP IP and UDP packets when sent over a network require a packet header This additional bandwidth requirement for these headers on y
9. grade distribution of live audio signals one or two way via TCP IP or UDP including multicast over IP networks Communications security and surveillance applications remote site monitoring Connection relay of intercom facilities between sites In store music distribution background music systems Distribution of PA public address and alarm announcements in Railway Stations Airports Shopping Centres and other public places e Delivery of live audio at conferences exhibitions concerts events etc without the need for additional cabling ee Product Manual amp Reference Guide _v1 2b Page 5 of 37 DESCRIPTION OF CONTROLS INDICATORS AND CONNECTORS Front Panel LIVE BROADCAST QUALITY AUDIO OVER IP NETWORKS AND THE INTERNET amp AuDIO 7X STL IP CEUK The front panel shows status indicators for Power TX transmit and RX Receive These indicators function as follows Power Red System initialising Green System ready and status OK TX Red Device not transmitting no connection or error Green Device transmitting OK RX Red Device not receiving no connection not framed or error Green Device receiving OK framed on incoming audio Rear Panel The rear panel has the following switches and connectors Power Push switch for On Off operation Mains Accepts standard IEC Connector 95 264 VAC 50 60 Hz auto sensing for connection worldwide operation Network Network connection for audio data
10. is automatically rotated older entries are discarded when the log becomes full It can also be cleared manually Status System Status at a glance The Status screen shows information Audiol X STL IP System Status Main Processor Temperature Ok taken from STL IP s internal system diagnostics Audio tw _ STL iF Internal Fan Ok Case Fan Ok amp Supply voltage 3 3 Ok G Supply voltage S Ok supply voltage 12 Ok Network Link Speed 100 Mbps Q Network Link Type Full Duplex G Network Collisions T TCP Retransmits T F Ancillary Data Inactive G T Ancillary Data Inactive Product Manual amp Reference Guide v1 2b Page 27 of 37 Email Receiving monitoring information via Email alerts AudiolTX STL IP can be setup to send alerts and information via email using a standard email server SMTP AudioTX STL IP EMail Notifications Email Notifications Enabled E Email the log Email address sales sttio com send an email notification immediately for the following events move mouse pointer over the SMTP server address questionmark icon to see an explanation of each G SMTP server part Device powerup Enabled Secure SMTP Disabled System status Enabled G FOP before SMTP Disabled E Network status Enabled Q Audio status Enabled Save and send test email e You can enable the sending of Email alerts upon certain categories of conditions Devi
11. network Stop Selection The Stop Selection stops transmission and reception A pop up window appears for confirmation before the audio is actually stopped Audio TN STL ie Product Manual amp Reference Guide v1 2b Page 18 of 37 SETUP MAIN MENU CONFIGURING YOUR STL IP UNIT In this section you ll find more details on various setup and configuration options for your STL IP units General Settings Identification allows General Setup you to label your device This label is shown in the title bar of Identification your web browser when using the web based control Access interface and is shown on the Remote terminal Status screen of other connected STL IP units which are receiving audio from this ACCeSS youcan setup a password for your STL IP system unit This password needs to be entered when starting the web based control interface If you use a password click Note The Remote Terminal is the Logout Sub Menu option top right when you have ei later inthe maintenance finished using the control interface Audio Settings In the Setup Audio Sub Audio Setup Menu you can set the STL IP unit s audio clock frequency for internally Clock frequency generated clock or set the g Clock source unit to use the clock from Audio capture source Analog inputs an external digital source connected to the Analog Input Gain AES EBU digital input or Analog Output Gain
12. see the unit s reconnect to the unit power cycling the device will return you MAC address to your old IP address settings See Product Manual amp Reference Guide v1 2b Page 20 of 37 ADVANCED OPERATION Forward Error Correction FEC Forward Error Correction is used where you have a network connection that is prone to errors Note that you should try the Jitter Buffer at the Receiving end before you attempt to solve a problem using FEC Network Jitter is more likely to be the cause of audio problems than network errors in most cases Jitter is explained in the next section TCP IP connections have error correction built in so FEC is not needed on or available for these FEC is only needed for UDP and Multicast connections which do not have any error correction and only where you experience network problems FEC 50 or FEC 100 can be selected individually in the Transmitter configurations TX 0 to TX 5 Audio is sent in network packets by STL IP When FEC is enabled error correction information is sent alongside the audio packets Errors in transmission can be detected and repaired using this method Additionally where packets arrive in the wrong order using FEC allows STL IP to re order network packets correctly The type of FEC selected will determine the severity and number of errors that can be corrected However the higher level of resilience also requires uses more additional network bandwidth alongside your audio F
13. talkback systems monitoring status information from or controlling remote devices etc When enabled RS 232 data going into an STL IP unit is transmitted to the remote STL IP unit or all remote STL IP units in the case of a Multicast connection or when using more than one transmitter Ancillary data received by the Receiver in an STL IP unit is output to the RS 232 ancillary data port Audio TN STL iP Product Manual amp Reference Guide v1 2b Page 22 of 37 In the Setup Ancillary Data Sub Menu you set the port hardware settings for the local STL IP device including port speed start stop parity bits and flow control Additionally and on the transmitting STL IP unit you also set the Max Data Speed This is the amount of network bandwidth reserved for your ancillary data i e the amount that can actually be sent Let s look at a real example Say you have a hardware port speed of 9600bps you have chosen this because the RS 232 device you are connecting to STL IP works at this speed Let s also assume that you have a Max Data Speed of 300bps because this is all the network bandwidth you want to use for ancillary data In this scenario it would be possible for you to feed more serial data into the RS 232 interface of the unit than it can send on your connection In this case the additional data is buffered for a short time If the overload continues then data will be lost The 9 pin D type RS 232 ancillary data connec
14. 0 GET ALL The Get command returns connection and audio settings for the channel with the specified ID or all channels Typical output from the GET command looks like this STL IP gt GET TX 0 TX 0 TCP IN 8800 PCM 48000 16 ST 1 This response shows that TX 0 is setup for an incoming TCP connection on port 8800 and will transmit PCM audio with a 48kHz sample rate and a 16 bit sample size The audio is stereo and uses a 1ms blocksize The response format of the get command is exactly the same as the argument format of the SET command and this format is explained below Command Set Syntax SET lt ChannellD gt lt connection setup gt lt audio setup gt Arguments See section below Examples SET TX 0 TCP OUT 10 0 0 22 8800 MP2 64000 48000 ML SET TX 4 UDP 10 0 0 11 8800 4 FEC50 LB 1 24000 18 ML 66 SET RX MULTI 225 0 0 36 8800 0 SET TX 3 DISABLED The Set command is used to define connection and audio settings for a particular channel Note that the Set command is only available when the STL IP is idle If the STL IP is active the Stop command should be issued before attempting to set a channel The format of the arguments is identical to the responses returned by the get command Tip To familiarise yourself with the argument format use the web based interface to create a setup for a channel and then use the get command to see corresponding Get Set parameters Arguments for the Set command are constructed as follows The first
15. 61 1 1 2 5 6 Trap event Yes OID 1 3 6 1 4 1 22861 1 1 2 11 Access read only Trap event No Values idle 0 connecting 15 Access read only listening 16 connected 20 Values of jitter buffer full with audio active 30 ee Product Manual amp Reference Guide v1 2b Page 31 of 37 IP based Remote Terminal Control Interface telnet style The STL IP remote terminal control interface is a simple system that allows the STL IP to be monitored and controlled via TCP IP Communication with the STL IP is achieved using simple text commands and responses This allows you to integrate management and control of your STL IP units into existing or custom software and hardware solutions and to automate functionality setups and control The interface can also be used and commands sent using Standard telnet terminal software The remote terminal control interface uses network port number 8996 Enabling the interface General Setup To enable the remote control port open the Setup gt General Q Identification Studio at MOOQUK menu on your STL IP Select Access Goer Tona i z Enabled for the Remote terminal item to activate the Remote terminal Enabled remote control terminal Starting the interface The simplest way to test the remote terminal control interface is by using a standard telnet program Set up the telnet program to make a connection on port 8996 on your STL IP The STL IP will respo
16. DO NOT connect a device that causes a current flow of greater than 1mA as doing so will cause damage to the STL IP unit ee Product Manual amp Reference Guide _v1 2b Page 24 of 37 Pin Input Output Function 2 Out Power Status ok Equivalent to green power light on front panel 3 Out Error When this signal is high the other status outputs are invalid For critical applications for example if you plan to use the RX status ouput below to switch to from backup feeds audio you should use appropriate logic including this output 4 Out TX ok Equivalent to green TX light on front panel 5 Out RX ok Equivalent to green RX light on front panel 16 Out Audio input level overload detector 17 Out Silence detector triggered input output or both Proxies Firewalls and Routers Where an AudioTX STL IP unit is used on a network containing routers and your audio will have to travel across one or more routers you may need to set a gateway address in the Setup Network Settings Sub Menu You should also pay particular attention to the TTL setting in the transmitter setups TX 0 to TX 5 if using UDP Multicast Where your STL IP device is behind a proxy or firewall and you are planning to send receive your audio a network beyond the proxy firewall most commonly the Internet please read the guidelines below Making an outgoing connection through the proxy firewall This section applies if One or more of the transmitters i
17. EC 50 This adds a good level of protection for most situations It requires additional network bandwidth of 50 of the audio bandwidth to function FEC 100 This is the maximum level of protection It requires additional network bandwidth of 100 of the audio bandwidth to function Note that in each case and in addition to the direct network bandwidth requirements for FEC there is also a network overhead associated with the additional packets used for the FEC This will be equal to the network overhead for the audio bandwidth for FEC 100 and equal to 50 of the network overhead for the audio for FEC 50 Using FEC also adds a small additional delay to your audio as a receiving STL IP system has to receive the FEC packets as well as the audio packets before being able to play the audio Jitter Buffer Network Safety Buffering Jitter explained With a good quality network connection say a LAN with network switches there is a smooth flow of network packets Each packet is sent by the transmitting STL IP device and takes more or less exactly the same time to be received at the receiving STL IP device This is analogous to a free flowing stream ee Product Manual amp Reference Guide v1 2b Page 21 of 37 On a poorer quality network say a WAN that is very busy or the Internet this may not be the case Packets may wait in short queues and be held up for tiny fractions of a second and so may arrive in bursts This is network jitter Thi
18. Manual amp Reference Guide _v1 2b Page 36 of 37 AUDIOTX STL IP LIMITED WARRANTY This Warranty covers the AudioTX STL IP Product the Product Period The Product is warranted to be free from defects in materials and workmanship for a period of one year from the date of purchase Acts of God This warranty is void if the Product is subject to Acts of God including without limitation lightning improper installation or mis use including without limitation the failure to use network telephone and power line surge protection devices accident neglect or damage Limitation of Warranty EXCEPT FOR THE ABOVE STATED WARRANTY MDOUK BROADCAST MAKES NO WARRANTIES EXPRESS OR IMPLIED INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE In no event will MDOUK Broadcast its employees agents authorised dealers or authorised distributors be liable for incidental or consequential damages or for loss damage or expense directly or indirectly arising from the use of any Product or the inability to use any Product either separately or in combination with other equipment or materials or from any other cause Claims under Warranty In order to invoke this Warranty notice of a warranty claim must be received by MDOUK Broadcast within the above stated warranty period and warranty coverage must be authorised by MDOUK Broadcast If MDOUK Broadcast authorises the performance of warranty service the de
19. P Multicast packets can cross before being dropped by the router Not shown for TCP IP connections For UDP and Multicast connections only TCP IP has error correction built into the protocol as standard Forward error correction FEC can be used in situations where you experience network packet loss FEC 50 adds 50 to the audio bandwidth plus additional network overhead and provides a good level of protection against network errors FEC 100 adds 100 to the audio bandwidth plus additional network overhead and provides a very high level of protection against network errors Select PCM Linear uncompressed MPEG J 41 or ADPCM See Table of Audio Types above Select sample rate required For PCM Linear and ADPCM 32 or 48 kHz choice of sample rate affects bitrate required for the connection For MPEG a 48kHz sample rate offers the lowest delay and best quality For J 41 sample rate is fixed at 32kKHZz Choose 16 or 24 bit audio here for PCM audio type Select Mono or Stereo audio For Mono audio can be taken from Left input Right input or a mix generated from both For MPEG audio types Joint Stereo and Dual Mono modes are also available Joint Stereo is a high efficiency method of coding MPEG stereo signals a little like M amp S coding see note in Table of Audio Types above Dual mono indicates to the MPEG encoder that the two Left Right channels should be encoded independenily The standard blocksize of 1ms offers the lowest
20. and web based control interface 10 100 10 100 Mbps Ethernet Professional RJ45 type connector Accepts standard RJ45 plug or Neutrik Ethercon professional RJ45 connectors GPIO TTL For connection of external devices Allows for the transmission and reception of TTL level signals to from a remote STL IP device This port also carries local device status information Ancillary Data Allows for the transmission and reception of ancillary RS 232 data RS 232 alongside the audio to from a remote STL IP device Wordclock Wordclock input for synchronisation to external digital devices BNC input connector Digital audio Digital AES EBU digital audio input output XLR connectors in out Analogue audio Analogue audio connection balanced line level XLR connectors in out Nominal level of 18db l e Odb analog at these connectors corresponds to 18dbFS digital full scale Audio T a STL i Product Manual amp Reference Guide v1 2b Page 6 of 37 THE WEB BROWSER BASED CONTROL INTERFACE AudiolTX STL IP is configured using a web browser based control interface Any standard web browser such as Internet Explorer or Netscape can be used Access to the control interface can be password protected if required The control interface is simple to use and with a little exploration and this manual you should be up and running within a few minutes To start the control interface type the IP address of your STL IP unit into th
21. argument is the ID of the relevant channel one of the TX channels TX 0 to TX 5 or the RX channel This is followed by the Connection Setup Arguments then finally the Audio Setup Arguments To disable a channel the set command only needs the channel ID and the DISABLED argument as shown in the TX 3 example above ee Product Manual amp Reference Guide _v1 2b Page 34 of 37 Below the Connection Setup Arguments are shown for each different type of connection TCP Outgoing TCP OUT lt Address gt lt Port gt TCP Incoming TCP IN lt Port gt UDP for TX UDP for RX UDP lt Address gt lt Port gt lt I TL gt lt FEC Type gt UDP lt Port gt Multicast for TX MULTI lt Address gt lt Port gt lt TTL gt lt FEC Type gt Multicast for RX UDP lt Port gt Valid FEC types are as follows for UDP amp Multicast only as shown above FEC50 FEC100 and FECOFF And here are the Audio Setup Arguments As with the connection settings not all Audio Setup Arguments are needed for all types of audio The table below lists the audio types and their arguments as used by the TX channels PCM MPEG Layer 2 MPEG Layer 3 J 41 ADPCM G 722 LB 1 lt Samplerate gt lt Samplesize gt lt Codingrate gt lt Devicemode gt lt Blocksize gt PCM lt Samplerate gt lt Samplesize gt lt Devicemode gt lt Blocksize gt MP2 lt Samplerate gt lt Codingrate gt lt Devicemode gt MP3 lt Samplera
22. ce Powerup useful to monitor for power failures System Status conditions detected during internal hardware diagnostics Network Status connection status changes connection loss congestion problems data or ancillary data loss and Audio Status overload silence detectors if enabled or digital clock issues e There s a more detailed explanation of the specific triggers covered by these categories in the SNMP section below the individual triggers that will result in an Email alert for each category are the same as the SNMP trap triggers e You can also setup your STL IP so that the System Log is emailed to you regularly If your mail server or one your ISP provides for you requires authentication via Secure SMTP or POP before relay these options can also be configured on this screen ee Product Manual amp Reference Guide v1 2b Page 28 of 37 SNMP Using SNMP Traps and Queries for device monitoring The Audiol X STL IP can answer status and monitoring queries and also send SNMP traps using a built in SNMP v1 agent This means that in larger installations standard network management software which supports SNMP can be used to monitor the status and condition of all of your STL IP units The following section describes in more detail both the traps and queries available each of the traps are shown Save Download MIB file SNMP configuration AudioTX STL IP SNMP and enabling of the traps is done on this SNMP Ag
23. e address bar of a web browser as follows http 10 0 0 10 Note You will need to correctly set the unit s Network Settings before accessing the control interface as described in the Quick Start Guide section later lf you have password protected your STL IP system you will be asked to enter the password The main Connections page is then displayed as shown below Prototype STLIP AudioTX STL IP Netscape a File Edit wiew Go Bookmarks Tools Window Help 9Q 90909 Ga X amp a amp Home G Radio My Netscape Ck Search Bookmarks STL IP UK Connections Setup Maintenance Logout Status Txo Connection TCP out 223 0 0 225 Port 8800 Audio info PCM 24 96000 Hz Stereo 1 ms 5024 kbps Status IDLE Ix 1 Disabled IxX2 Disabled TX3 Disabled X4 Disabled IX5 Disabled Source Audio received on TX 0 RX Status IDLE Copyright MMI MDOUK See Product Manual amp Reference Guide _v1 2b Page 7 of 37 Menus amp Settings The Control Interface has three Main Menu selections Connections Setup and Maintenance Clicking on any of these three options brings up the appropriate Sub Menu in the darker blue bar immediately below In the main section of the page below Main and Sub Menus are the various settings and configuration items for that Main or Sub Menu section STL IP UK Connections Setup Maintenance Logout e Main Menu Selections Sub
24. e used to determine the Cause Command Start Syntax START Arguments None The start command makes the STL IP active This is equivalent to clicking the Start button on the STL IP connections page Command System Syntax SYSTEM Arguments None The system command gives an overview of the system status This is similar to the information shown on the Maintenance system page of the STL IP web based user interface Commands Log Syntax LOG Arguments None Returns the contents of the maintenance log Audiol _ STL IF Product Manual amp Reference Guide Commands Command Channels Syntax CHANNELS Arguments None The channels command returns the status of the individual TX and RX channels e g Connected Idle This is similar to the information shown on the Connection Status page of the STL IP web interface Command Stop Syntax STOP Arguments None The stop command makes the STL IP idle This is equivalent to clicking the Stop item on the STL IP connections page Command Quit Syntax QUIT Arguments None With the quit command the connection to the remote control interface is closed The remote terminal interface will still be active to start again just make a new connection v1 2b Page 33 of 37 Command Get Syntax GET lt ChannellD ALL gt Arguments The ID of a channel e g TX 0 to TX 5 or RX or all Examples GET RX GET TX
25. eference Guide v1 2b Page 9 of 37 Now start a web browser such as Internet Explorer or Netscape on the PC and type the following in the address bar and press the Return Enter key http 10 0 0 10 You should see the web browser based control interface appear in the browser window Click the Setup Main Menu item and then select the Network Sub Menu STL IP MibteiUK Connections Setup Maintenance Manual Toolbox General Audio Ancillary Data Clock Network Device Idle Network Setup G eb port number ol Host name oT LIF Domain name domain com IP address 10 0 0 10 Subnet mask 255 255 255 0 amp Gateway K Primary DNS Secondary DNS MAC Address OU40bS0068455 Update network Copyright MMM MDOUK Enter the IP address and Subnet Mask and Hostname you want your STL IP unit to use on your network and click the Update Network button lf you are unsure as to what to enter here consult your network administrator You may also need want to enter Gateway and DNS Server information and these settings are described in detail later in this manual in the Setup Main Menu configuring your STL IP unit section Audio STL i Product Manual amp Reference Guide v1 2b Page 10 of 37 Your STL IP device is now setup to use your new network settings Don t forget to change the network settings back on the PC you used for configuration You will now need to reconnect to the web
26. ent Enabled screen You can also download the device SNMP port number MIB file from here E Read Community a wrie Communi which each cover a SNMP Traps Enabled category oi Trap adress O status monitoring information The first is Trap port number Device Powerup used send a trap Immediately for the following events move mouse for monitoring power pointer over the questianmark icon to see an explanation of each failures The other Q Device powerup Disabled oe each coer the P system status Disabled ree malin branches detailed below Ga Network status Disabled and the triggers for Audio status Disabled SNMP Branches for STL IP and Trap information The Device Powerup trap is of the SNMP generic type and has the value warmStart 1 This in accordance with the SNMP specification indicates that the device has just been re started has come back to it s original status and does not require re configuration The other three traps are of the device specific type and can have the value system 1 network 2 or audio 3 Each trap contains the OID and current value of the event that caused the trap For example when the RX status becomes active a device specific trap with value network 2 will be sent and the trap will contain the OID 1 3 6 1 4 1 22861 1 1 2 7 and the value active 1 Not all information in the STL IP MIB tree is considered to be a trap event All values that will
27. fective Product must be delivered shipping prepaid to MDOUK Broadcast MDOUK Broadcast will at its option either repair or replace the Product and such action shall be the full extent of MDOUK Broadcast s obligation under this Warranty After the Product is repaired or replaced MDOUK Broadcast will at its own cost return it to the party that sent the Product ee Product Manual amp Reference Guide v1 2b Page 37 of 37
28. generate a trap when they change are marked with trap event yes in the section that follows ee Product Manual amp Reference Guide _v1 2b Page 29 of 37 System branch Internal fan status Shows the current status of the internal fan OID 1 3 6 1 4 1 22861 1 1 1 1 Trap event Yes Access read only Values ok 0 low 2 stopped 3 Case fan status Shows the current status of the case fan OID 1 3 6 1 4 1 22861 1 1 1 2 Trap event Yes Access read only Values ok 0 low 2 stopped 3 Main processor temperature Shows the current status of the temperature of the main processor OID 1 3 6 1 4 1 22861 1 1 1 3 Trap event Yes Access read only Values ok 0 high 1 3 3V supply voltage Shows the current status of the 3 3V power supply OID 1 3 6 1 4 1 22861 1 1 1 4 Trap event Yes Access read only Values ok 0 high 1 low 2 5V supply voltage Shows the current status of the 5V power supply OID 1 3 6 1 4 1 22861 1 1 1 5 Trap event Yes Access read only Values ok 0 high 1 low 2 12V supply voltage Shows the current status of the 12V power supply OID 1 3 6 1 4 1 22861 1 1 1 6 Trap event Yes Access read only Values ok 0 high 1 low 2 Audiol _ STL IP Product Manual amp Reference Guide Audio Branch Input overload The overload indicator is sticky an overload value shows that there has been an overload since the last reset To reset t
29. he indicator back to ok write a value to the indicator The actual value written to the indicator will be discarded the indicator will always reset to ok OID 1 3 6 1 4 1 22861 1 1 3 1 Trap event Yes Access read write Values ok 0 overload 1 Input silence detector The input and output silence indicators are sticky a value of silence indicates that the silence detector has been triggered since the last reset To reset the indicator back to ok write a value to the indicator OID 1 3 6 1 4 1 22861 1 1 3 2 Trap event Yes Access read write Values ok 0 silence 1 inactive 2 Output silence detector OID 1 3 6 1 4 1 22861 1 1 3 3 Trap event Yes Access read write Values ok 0 silence 1 inactive 2 Audio clock status The STL IP can be setup to use the clock from the digital input or the external word clock input If this clock signal is not within the range supported by the STL IP then the clock status will show invalid OID 1 3 6 1 4 1 22861 1 1 3 4 Trap event Yes Access read only Values ok 0 invalid 1 Audio clock frequency The STL IP constantly measures the audio clock The actual measurement is shown in this field The measurement resolution is in 16Hz steps OID 1 3 6 1 4 1 22861 1 1 3 5 Trap event Yes Access read only Values Frequency of the clock in Hz v1 2b Page 30 of 37 Network Branch Network interface speed RX channel status
30. igure audio connections 16 Transmit Settings TX 0 to TX 5 16 Network bitrates 18 Receive Seitings RX 18 Start 18 Stop 18 Setup Main Menu configuring your STL IP unit 19 General Settings 19 Audio Settings 19 Ancillary Data Settings 20 Clock Settings 20 Network Settings 20 Advanced operation 21 Forward Error Correction FEC 21 Jitter Buffer Network Safety Buffering 21 Silence detectors input output 22 Transmitting and Receiving ancillary RS 232 data alongside audio 22 GPIO end to end TTL signals alongside your audio 23 Status outputs available on the GPIO connector 24 Proxies Firewalls and Routers 25 Pe Product Manual amp Reference Guide v1 2b Page 3 of 37 Maintenance Main Menu Monitoring Control of your STL IP unit 27 The System Log 27 System Status at a glance 27 Receiving monitoring information via Email alerts 28 Using SNMP Traps and Queries for device monitoring 29 IP based Remote Terminal Control Interface telnet style 32 AudioTX STL IP Toolbox software for Windows PCs 36 Limited Warranty 37 Ce Product Manual amp Reference Guide v1 2b Page 4 of 37 INTRODUCTION AudiolX STL IP can send and receive live audio over IP Networks and the Internet Designed for broadcast and professional audio use STL IP combines extremely robust high quality audio with a low delay AudiolTX STL IP can send and receive Linear uncompressed audio or bitrate reduced audio us
31. ing Professional MPEG Layer 2 and Layer 3 near transparent J 41 ADPCM G 722 and LB 1 very low bitrate coding for speech audio coding algorithms Audio can be Mono or Stereo and can use a wide range of sample rates and bitrates to suit most requirements One single STL IP unit can send your audio to up to 6 separate destinations if required Each destination can use TCP IP UDP or UDP Multicast networking allowing you to send audio to an infinite number of remote locations and can source the audio from the built in MPEG or ADPCM encoders or use Linear or J 41 audio modes STL IP can receive audio from one remote location STL IP is suitable for a wide range of audio applications Broadcast applications include STL Studio to Transmitter Links Programme Distribution and Sharing Outside Broadcasts Remotes Intercom talkback and contribution circuits for TV and Radio Live audio from IP Satellite trucks Live audio over broadband internet An instant audio tieline over your existing network infrastructure Multicast audio distribution over Telco networks Satellite LAN WAN and all multicast capable networks for efficient live audio distribution Delivery of live audio to Satellite uplink points e Permanent and ad hoc broadcast quality audio connectivity between sites and studios e General Studio connectivity and a wide range of other broadcast audio applications Non Broadcast applications include e Telco carrier
32. lection G 722 available via ADPCM selection LB 1 available via ADPCM selection x1 2 x3 x4 Bitrate 256kbps to 4608kbps 32kbps to 384kbps Layer 2 32kbps to 320kbps Layer 3 384kbps Mono or 768kbps Stereo 128 192 kbps Mono or 256 384 kbps Stereo 64kbps 12kbps to 40kbps 16kHz sample rate 18kbps to 60kbps 24kHz sample rate Modes Mono Stereo 16 or 24 bit 16 to 96kHz sample rate Mono Stereo Joint Stereo Dual Mono 16 bit 16 to 48kHz sample rate Mono Stereo 16 bit 32kHz sample rate Mono Stereo 16 bit 32 or 48kHz sample rate Mono 16 bit 16KHz sample rate Mono 16 bit 16 to 24kHz sample rate Delay Sms 50ms Layer 2 140ms Layer 3 5ms 5ms 5ms 40ms 16khz 50ms 24kHz Description Delivers Linear audio with no compression Excellent quality Mono audio at 64kbps and above amp Stereo at 128kbps and above Layer 2 Transparent audio quality at 128kbps Mono and 256kbps Stereo Layer 3 Near transparent audio quality at 64kbps Mono and 128kbps Stereo Professional grade near transparent audio offering a bitrate reduction of 25 High quality Low delay alternative to MPEG Layer II compression Delivers 7 5KHz mono audio ideal for speech Allows for good quality mono speech audio at lower bitrates The 16kHz sample rate setting gives 7 5kHz audio bandwid
33. n your STL IP unit will make an outgoing TCP IP connection and or send audio via UDP The Receiver in your STL IP unit will make an outgoing TCP IP connection to receive audio You will need to check the following The proxy firewall must be set up to allow outgoing network connections TCP IP or UDP depending on your selection in STL IP on the port number s you have setup STL IP to use 8800 by default The proxy firewall must be capable of acting as a gateway or your network router may act as the gateway and communicate via the proxy firewall automatically and you will need to set the appropriate gateway in the STL IP Setup Network Settings Sub Menu ee Product Manual amp Reference Guide _v1 2b Page 25 of 37 Accepting incoming connections through the proxy firewall This section applies if One or more of the transmitters in your STL IP unit will be set up to wait for an incoming TCP IP connection The Receiver in your STL IP unit will be setup to wait for an incoming TCP IP connection to receive audio The Receiver in your STL IP unit will be setup to receive audio via UDP You should check the following Audio TN STL IP The proxy firewall should be set up to accept connections from the outside network on the port s you are using for your relevant connections in STL IP The proxy firewall should forward the connection data to the STL IP unit using its address on your internal network and on the
34. nd on your telnet screen with the STL IP gt prompt The prompt will show Login gt if your STL IP is setup to require a password The login will be valid until the TCP IP connection with the remote interface is broken If you do not immediately see a prompt in your telnet screen then you may need to press the lt enter gt key on your keyboard to activate the interface The remote control terminal commands The following sections describe the commands and arguments used by the remote control interface e Commands and arguments are not case sensitive and are separated by white space characters e A new line character after the last argument signals the end of the command string e Note that it is not possible to make modifications to the channel setup whilst the STL IP unit is active you would need to issue the Stop command first make your changes using the Set command then issue the Start command Audio TN STL ie Product Manual amp Reference Guide v1 2b Page 32 of 37 STL IP Remote Terminal Interface Command Status Syntax STATUS Arguments None The status command returns an overview of current connections This is similar to the functionality provided by the front panel lights of the STL IP Device status is shown as Active or Idle and T X RX is shown as Problem or Active corresponding to Red Green lights on the front panel If the response shows a problem then the Channels Log and Get commands can b
35. ollows this Paty one Stopbits Clock Settings Setting the time date of your STL IP device is worth doing it means that you can see what s been going Time lo iy 4 on with your system in the Date Maintenance Log Time and date Setup J wt Network Settings In the Setup Network Sub Network Setup Menu you can set the STL IP units network settings Web port b Each device on your ena network should have a Host name IP unique Hostname and IP Q Domain name domain com address with matching Subnet Mask A gateway P address may be required on WANs K Subnet mask or where the STL IP will CI fis i need to access the Internet Gateway via a router or firewall Primary DNS setup of DNS servers is Secondary ONS optional and allows you to use a FQDN Fully G MAC Address 004030 LSAS Qualified Domain Name instead of an IP address If you are unsure of what to enter here please contact your when making connections network administrator for help Note as a precaution changes to your IP address are made temporarily when you You can also change the click Save You then need to enter the new IP address into default port 80 on which your browser When you connect successfully for the first the built in web browser time the change is stored permanently If for some reason control interface answers you have saved the wrong IP address and so cannot queries and
36. one of the TX transmitters click on the appropriate en button TX 0 to TX 5 Disabled ee g TxX 2 Of course if you want your STL IP Disabled device to simply send and receive i aa audio in a pairing with just one other 1X3 STL IP device you only need to setup the TX 0 and RX you can ignore TX i e a 1 to TX 5 g TXA Disabled i a TXS Receive Status onn To change the settings for how the RX SONN yi status eae STL IP receives audio click on the RX button ee Product Manual amp Reference Guide _v1 2b Page 13 of 37 Table of Connection types Connection Suitable for Type LAN WAN and Non Internet networks TCP IP Yes Outgoing TCP IP Yes incoming UDP Yes Multicast Yes Audiol _ STL IP Suitable for Internet use Yes Yes Yes No Product Manual amp Reference Guide v1 2b Page 14 of 37 Description Makes a TCP IP connection to the remote IP address supplied and on the port number specified TCP IP connections have built in error correction Waits for an incoming TCP IP connection on the port number specified TCP IP connections have built in error correction Makes a UDP connection to the IP address supplied on the port number specified Allows Multicasting one to many of audio Table of Audio types Audio Type PCM Uncompressed MPEG Layer 2 MPEG Layer 3 available via MPEG selection J 41 ADPCM available via ADPCM se
37. our audio data packets is shown in this field If you are using Error correction Ancillary data then these additional packets will also have a similar overhead and this is also included in the figure here Receive Settings RX RX AudioTX STL IP can receive audio from a remote STL Source IP independently of audio transmission The RX Address settings allow you set up the unit to receive audio Port number Jitter buffer oo Source Select the network type that will be used to receive audio Address Shown for TCP IP outgoing only When you select TCP IP outgoing STL IP makes a connection to another STL IP unit on this IP address and on the port number specified on the next line Port Number For TCP IP incoming UDP and Multicast the port number to listen on for an incoming TCP IP connection or UDP data For TCP IP outgoing the port number on the remote unit to connect to Jitter Buffer The Jitter Buffer allows for a network safety buffer to be set up This should be used where the network provides bursty data instead of a smooth flow Without a jitter buffer this would result in choppy audio The jitter buffer is set in milliseconds Start Selection The Start Selection starts the transmission and reception of audio Note Once the device is started your connection s will be maintained If the device is powered off or a mains or network failure occurs STL IP automatically reconnects on power on or return of mains
38. ransmitter and RX the receiver You can leave TX 1 to TX 5 set as Disabled Where you do plan to use one STL IP to send audio to multiple other units you can make settings on each of the transmitters TX 0 to TX 5 independently The options displayed change according to the Connection Type and Coding Type selected Connections Setup Maintenance Logout TX0 Connection ype UDP Coding ipe PCM uncompresed Address Samplerate Port number Samplesize TIL 4 Device mode Error Correction Block Size ee Product Manual amp Reference Guide v1 2b Page 16 of 37 Connection Type Address Port Number TTL Error Correction Coding Type Sample Rate Samplesize Device Mode Block Size Audiol _ STL IP Product Manual amp Reference Guide v1 2b Page 17 of 37 TCP IP outgoing TCP IP incoming UDP Multicast Disabled See Table of Connection Types above For TCP IP outgoing amp UDP The IP address to connect send to For UDP Multicast the Multicast group IP address to send audio to Multicast group IP addresses range from 224 0 0 1 to 239 255 255 255 Not shown for TCP IP incoming For TCP IP outgoing UDP and Multicast the port number to connect send to on the remote machine For TCP IP incoming the port number on the local unit on which to wait for the incoming connection Time to Live TTL for UDP and Multicast connections This is the number of routers across which UD
39. re on your PC for future use see the section at the end of this manual ee Product Manual amp Reference Guide v1 2b Page 12 of 37 Gigjuk CONNECTIONS MAIN MENU SETTING UP AUDIO CONNECTIONS Guide to Connection and Audio types AudiolTX STL IP can send and receive linear uncompressed audio at a range of sample rates and in Mono or Stereo It can also operate using a number of built in audio codecs to reduce the required bitrate where necessary All of these options are explained later in this section STL IP can transmit audio to up to six different connections simultaneously these can each be TCP IP UDP or Multicast connections If you simply want to send and receive audio between two units you only need to set up TX 0O and RX below you can ignore TX 1 through TX 5 Tip If you simply want bi directional audio between two units the best and easiest way to do this is to set up TX 0 on the first device for TCP IP outgoing and on the second device for TCP IP incoming Set the RX on both devices to Audio Received on T X 0 The first 6 rows on the Connections Sues er Status Sub Menu show the status of Connections Setup Maintenance the 6 transmitter connections labelled Stat ctart St TX 0 to TX 5 The final row shows the maa AE status of the receiver labelled RX Transmit status TXO P 0u TT ei Ayal To change the settings for how the 9U24 kbps Status ae STL IP unit sends audio on
40. s is not good for live audio A jitter buffer is like a reservoir it s a small pool of audio kept in reserve by the receiving STL IP device which smooths out the burstyness of your network The Jitter Buffer setting in the RX configuration Receiver configuration allows you to enable and set the size of the jitter buffer in milliseconds You can start with say 10ms and increase the value until you have smooth reliable audio Silence Detectors Input Output STL IP has built in silence detectors that can be used to monitor the audio input and or the audio output The silence detectors are enabled and configured via the Setup Audio settings sub menu These silence detectors can be used to trigger an Email alert or an SNMP trap or can be queried via SNMP Input and or output silence detectors can be enabled 2 You can also set here the Input Silence Detector threshold of the silence Output Silence Detector detectors in dB relative to Silence Level EE digital full scale audio this corresponds to 18dB at Silence Duration the analog in outputs and the minimum duration of Save the silence before an alert is triggered Transmitting and Receiving Ancillary RS 232 data alongside audio Audiol X STL IP can send and receive ancillary data alongside and in sync with your audio The STL IP accepts and outputs this ancillary data via the RS 232 port on the back of the unit This is useful for control data visual
41. s may occur when the Port Speed is lower then the actual rate at which the ancillary data is received from the remote unit TCP retransmits The total number of TCP retransmissions for all OID 1 9 6 1 4 1 22861 1 1 2 9 of the current TCP connections since the start of i ves don merenicenon Values ok 0 problem 1 inactive 2 OID 1 3 6 1 4 1 22861 1 1 2 4 Trap event No Ancillary data TX status Access read only The status of the ancillary data transmitters problems may occur when you try to send ancillary data at a much TX channel status higher rate than the Max Data Speed Each TX channel has its own value This status is the same as that shown on the Connections oD l P OA AAO lee Status page in the web interface Irap Veni Yes Idle Connecting the channel is trying to Access read only connect or reconnect Listening waiting foran Values ok 0 problem 1 inactive 2 incoming TCP IP connection or UDP stream Connected a temporary or problem state Jitter buffer usage there is a network connection but currently no The STL IP tries to keep the buffer as full as possible to audio Active all is fine and audio is being sent ensure that there are no interruptions to your audio The ok fact that the jitter buffer is 90 full does not necessarily mean that a shorter buffer can be used for this connection OID from 1 3 6 1 4 1 22861 1 1 20s it s a momentary measurement to 1 3 6 1 4 1 228
42. same port number This is Known as a Reverse TCP IP bridge or a Reverse UDP bridge or is sometimes known as Port Forwarding This setup for TCP IP is very similar to the scenario where you wish to run a web server on your internal network that is accessible to the outside world a web server would normally work on port 80 you should replace references to port 80 with the port s you wish to use Product Manual amp Reference Guide v1 2b Page 26 of 37 MAINTENANCE MAIN MENU MONITORING CONTROL OF YOUR STL IP UNIT View Log The System Log Your STL IP device maintains a system log including events such as device power on network connection and hardware status Information on problems such as network connection failures congestion etc are also recorded here This is often useful in troubleshooting troublesome network connections as it will tell you when and in some cases why a problem occurred Thu Hay Thu May Thu Hay Thu May Thu Hay Thu May 19 19 19 19 193 19 a Bee ba 1l 2 Ot oe Be 11 BEE Be i Be 31 EE Boa aele al Ae 41 41 41 41 41 ta AudioTX STL IP Log 2005 Host MO STL IF Domain mdouk cor 2005 Using IP address 223 0 0 4225 netmask 255 255 255 0 2005 Setting up Gateway 42235 0 0 21 2005 Network link Speed 100 Mbps 2005 Network link type Full Duplex rth BS 5 EB Bea oot ten lerdver estes expresses we Be etd Se A ee powered an Clear Log The log
43. te gt lt Codingrate gt lt Devicemode gt J41 lt Samplerate gt lt Devicemode gt lt Blocksize gt ADPCM lt Samplerate gt lt Devicemode gt lt Blocksize gt G722 lt Samplerate gt lt Devicemode gt lt Blocksize gt LB1 lt Samplerate gt lt Codingrate gt lt Devicemode gt lt Blocksize gt The samplerate in Hz Examples 48000 44100 and 32000 The number of bits used per sample The coding rate in kbps Examples 24 64 and 320 Two letter code of the device mode See the list below The amount of audio sent per block in milliseconds Two letter codes for the device mode ML Mono left channel only MR Mono right channel only MB Mono both channels mixed ST Stereo JS Joint Stereo only for MPEG compressions DM Dual Mono only for MPEG compressions The RX channel has only one Audio Setup Argument the size of the jitter buffer in milliseconds The value can range from 0 to 5000 Me Product Manual amp Reference Guide v1 2b Page 35 of 37 AUDIOTX STL IP TOOLBOX SOFTWARE The AudioTX STL IP Toolbox software is a suite of Windows applications included with your STL IP device that allow remote monitoring of all STL IPs attached to your network You can install the Toobox on your PC by clicking on the Toolbox button in the STL IP web based control interface The applications are installed in a new folder in the Start menu of your PC labelled AudiolTX STL I IP
44. th and the 24kHz setting gives 11 5kKHz audio bandwidth The maximum bitrate selection in each case gives the highest quality As with MPEG algorithms reducing the bitrate makes the coding artefacts more audible As a guide we have found that 20kbps for 16kHz sample rate and 30kbps for 24kHz sample rate offer a good balance where you need low bitrates In Mono modes audio can be sourced from Left input Right input or a mix of Left amp Right Delay column assumes that a 1ms blocksize is selected where appropriate Approximate MPEG delay at 48kHz Lower sample rate increases delay frame size increases For MPEG Layer 2 coding of Stereo audio Joint Stereo mode recommended for bitrates below 256kbps Stereo mode for bitrates of 256kbps or above For MPEG Layer 3 changeover at 192 kbps approx Audiol _ STL IF Product Manual amp Reference Guide v1 2b Page 15 of 37 Status view and configure audio connections The Connections Status Sub Menu shows the current transmit and receive settings for your STL IP device When the unit is active sending receiving audio you can view settings When the device is not active you can change settings by clicking on the green TX 0 to TX 5 and the red RX buttons Transmit Settings TX 0 to TX 5 In most simple configurations you will be connecting two STL IP units to send and receive audio between them In these cases you only need to setup TX 0 the primary t
45. tor in STL IP uses standard pinouts as shown below Pin Function Direction Class Description 1 DCD Device gt STL IP Control Data Carrier Detect 2 RXD Device gt STL IP Data Data sent from the device into the STL IP 3 TXD STL IP gt Device Data Data output from the STL IP to the device 4 DTR STL IP gt Device Control Data Terminal Ready 5 Ground 6 DSR Device gt STL IP Control DataSet Ready 7 RTS STL IP gt Device Control Flow Request to Send 8 CTS Device gt STL IP Control Flow Clear to Send 9 RI Device gt STL IP Control Ring Indicator Where flow control is not used only Pins 2 3 and 5 are needed For devices that use hardware flow control connections should also be made to Pins 7 and 8 GPIO End to end TTL signals alongside your audio WARNING Read the whole of this section completely before making connections to the GPIO Status port Damage to the unit may result from connecting a device which sinks or sources more than 1mA of current or from making connections incorrectly Such damage is not covered by the warranty PE Product Manual amp Reference Guide v1 2b Page 23 of 37 Audiol X STL IP is able to send logic level signals alongside and in sync with your audio This can be used for remote operation of equipment or relaying of signals between locations where STL IP devices are installed The unit has 4 inputs and 4 outputs which operate using 5 volt TTL logic The GPIO inputs and ou
46. tputs can ONLY accept and provide logic signals they will not sink or source current greater than 1 milli Ampere ma DO NOT connect a device that causes a current flow of greater than 1mA as doing so will cause damage to the STL IP unit Simple and cheap logic chips or transistor drive circuits must be used to buffer the inputs and outputs for say the connection of LEDs or relays Operation is straight forward No additional setup or configuration is required The TTL levels present on the STL IP GPIO inputs are reproduced on GPIO outputs of the or all remote STL IP units receiving audio from the local device If the local STL IP unit is receiving audio from a remote device the states of the GPIO inputs at the remote device are reproduced on the GPIO outputs of the local STL IP device The pinouts of the GPIO connector are shown below Pin Input Output Function 13 In Input A 12 In Input B 10 In Input C 11 In Input D 6 Out Output A 7 Out Output B 8 Out Output C 9 Out Output D Status outputs available on the GPIO connector The GPIO connector also carries 4 status outputs which show the operational status of the local STL IP unit and 2 additional outputs show the status of the Audio Silence Overload detectors These outputs can be used to switch to backup audio feeds in case of network mains failure The Status outputs can ONLY provide logic signals they will not sink or source current greater than 1 milli Ampere ma
47. work switch setup the STL IP system on your network Your STL IP device ships with a factory pre set IP address and network settings You will most likely need to change these so that each STL IP device has a unique IP address together with a valid Subnet mask and a unique Hostname on your network Your STL IP device s will not function on your network and will not be able to start the Web Based Control interface until you have done so The factory pre set network settings are as follows Web port number Host name a Domain name domain com IP address 10 0 0 10 G Subnet mask 255 255 255 0 amp Gateway E Primary ONS G Secondary DNS MAC Address OO40bS008453 Mat Connect the STL IP unit and a PC that you plan to use for configuration via a network switch or using a crossover network cable set the PC s IP address and network settings as Internet Preterol CICR IR Properties follows gt ee You can get IP settings assigned automatically if your network supports is oie aly pore need to ask your network administrator for P Ad d ress 1 0 0 0 1 Obtain an IP address automatically Subnet Mask 255 255 255 0 ce enh ine IP address 10 sO 8 1 Subnet mask 255 255 255 0 Clear entries for Default Gateway Preferred and TE acl Alternate DNS Servers Use the following DNS server a ddresses Preferred DNS server Alternate DNS Ji AE Product Manual amp R
Download Pdf Manuals
Related Search