Black Box G.703/G.704 NTU w/10BaseT User Manual
Contents
1. Note When the data rate is set to 2 048Mb s then the unit is forced into G 703 mode and it transmits user data on all 32 time lots There is no framing information therefore the CRC4 MF SW2 2 switch is ignored In all other rate settings the unit employs G 704 framing TSO is reserved for signaling 3 15 20 SWITCH SW2 3 DATA INVERSION Set Switch S2 3 to determine whether or not the data stream from the local DTE is inverted within the MT334A before being passed to the G 703 G 704 network An inverted data stream may be required when you use the MT334A to commu nicate with a G 703 device that inverts the data on the remote end In typical installations data inversion is not necessary Data not inverted On Data inverted 3 15 21 SWITCH SW2 4 REMOTE DIGITAL LOOPBACK TYPE The user can set this variable to select the type of remote loop that will be initi ated by the MT334A If set to V 54 the MT334A will initiate a V 54 loop when Remote Loop is selected by the front panel switches If set to CSU the MT334A 6 G 703 G 704 NTU W 10BASET will initiate a CSU loop when Remote Loop is selected by the front panel switches S2 4 RDL Type Off Initiate a V 54 RDL loop when selected On Initiate a CSU loopback when selected 3 15 22 SWITCH SW2 5 FRONT PANEL SWITCHES As the Front Panel Switches may be inadvertently toggled or in the event that the end user may not need to use the switches the2. 3 T 6 RD 6 TD Figure 9 Connecting the 10Base T Ethernet Port to a Hub o G 703 G 704 NTU W 10BASET 4 19 Power connection The MT334A uses a 5VDC 2A universal input 100 240 VAC power supply center pin is 5V The universal input power supply has a male IEC 320 power entry connector This power supply connects to the MT334A by means of a barrel jack on the rear panel Many international power cords are available for the uni versal power supply Note The MT334A powers up as soon as it is plugged into an AC outlet there is no power switch There are no user serviceable parts in the power supply section of the MT334A Contact Black Box technical support at 1 724 746 5500 for more information WARNING G 703 G 704 NTU W 10BASET 5 Operation When the MT334A has been properly configured and installed it should operate transparently This sections describes power up LED status monitors and the built in loopback test modes 5 20 Power up Before applying power to the MT334A refer to section Power connection on page 21 and ensure that the unit is properly connected to the appropriate power source 5 21 LED status monitors The MT334A features six front panel LEDs that monitor connections on the G 703 G 704 and 10BaseT links signaling error and test modes Figure 10 shows the front panel location of each LED Descriptions of each LED follow Figure 10 vr G g1
3. 2 Perform a bit error rate test BERT using the internal V 52 generator as described in section Using the V 52 BER Test Pattern Generator on page 26 or using a separate BER Tester If the BER test indicates a fault and the Local Line Loopback test was successful for both MT334As you may have a problem with the twisted pair line connection 5 22 29 CSU LOOP Although CSU Loop is predominantly a T1 function the MT334A MT334A responds to central office initiated loop commands Customers can use this facil ity when the Central Office network switch supports CSU loops over an El interface When CSU Loopis selected and when in D4 framing mode the MT334A MT334A will implement the loop up command when it recognizes the pattern 10000 in the data stream for a minimum of 5 seconds The loop down com mand is implemented by the pattern 100 in the data stream for a minimum of 5 seconds o A G 703 G 704 NTU W 10BASET The MT334A MT334A will respond to Universal Loopback De activate to clear all central office loops 5 22 30 USING THE V 52 BER TEST PATTERN GENERATOR To use the V 52 BER tests in conjunction with the Remote Digital Loopback tests or with Local Line Loopback tests follow these instructions 1 Locate the 511 511E toggle switch on the front panel of the MT334A and move it UP This activates the V 52 BER test mode and transmits a 511 test pattern into the loop If any errors
4. 5 10 LED status monitors 0 00 eceecesseeesecceeeseeecsesseeceeeeeesseecseeeeeneeees 22 5 11 Loop V 54 amp Telco diagnostics ooooooccocccononncnnconccnncnnncnncnnncnncnnnnns 24 Le G 703 G 704 NTU W 10BASET 5 11 12 Operating Local Loopback LL 0 eee eee eeeeetecteeeeeees 24 5 11 13 Operating Remote Digital Loopback RL eee 24 3 11 14 CSU LOO p iii iii Bos eee 25 5 11 15 Using the V 52 BER Test Pattern Generator 26 A G 703 G 704 specifications eee eee cee cseceseeseceseesecesceseceseeeeeeeeeeseaeeaes 27 B Ethernet 10Base T specifications oooooncnnnnnnnnonconcconconocononnnonncnn nan cnncrnncnnos 29 G 703 G 704 NTU W 10BASET 1 General information Thank you for your purchase of this Black Box product If any questions arise during installation or use of the unit contact Black Box Tech Support at 724 746 5500 1 12 Features Terminates G 703 and G 704 clear channel structured El service n x 64 kbps data rates to 2 048 Mbps 10Base T Ethernet bridge PPP Point to Point Protocol RFC 1661 with Bridge Control Protocol RFC 1638 75 ohm dual coax and 120 ohm twisted pair G 703 connections Local and remote loopback diagnostics Internal and G 703 network timing CE approval 90 260VAC Conforms to ONP requirements CTR 12 and CTR 13 for connection to interna tional Telecom networks 1 13 Description The MT334A receives channelized G 704 n x 64 kbps or
5. N pot oes jo a Test Mode TM switches E1 Link Figure 10 MT334A front panel 2 G 703 G 704 NTU W 10BASET El Link Active Green Solid green On indicates that the end to end El Link is up signifying that the link is active The El Link LED is Off when the link is down 10BT Link Active Green Solid green indicates that the 10Base T Ethernet interface has detected a valid SQE heartbeat signifying a valid 10Base T connection Status Blinks yellow from one to eleven times to indicate system status Each pulse pattern is separated by a 2 second off period Greater pulse patterns have higher priority buffer saturation has greater priority than an empty MAC table Valid system statuses are 1 pulse System status is okay 2pulses no MAC entries in the MAC Address Table 3 pulses Clear to Send CTS or Carrier Detect DCD from base unit are not asserted 4 pulses IM1 l buffer is saturated 5 pulses WAN receive frame s too large 6 pulses WAN receive frame s not octet aligned 7 pulses WAN receive frame s aborted 8 pulses Detected WAN receive frame s with CRC 9 pulses Detected LAN receive frame s too large 10 pulses Detected LAN receive frame s not octet aligned 11 pulses Detected LAN receive frame s with bad CRC LOS The Loss of Sync LED lights when the unit loses synchronization with the incoming signal This may happen when there is a framing mismatch or a loss of signal In unfra
6. TSO is reserved for signaling SWI sz Clock Mode On On Network Receive Recovered On Off Internal Off On Internal Off Off Network Receive Recovered 3 15 17 SW1 6 AND SW1 7 CLOCK MODES Network Clock Transmitter timing is derived using the receive line signal receive recovered from the network Internal Clock Transmitter timing is derived from an internal clock source G 703 G 704 NTU W 10BASET Position Function Factory Default Selected Option SW2 1 Line Coding Off HDB3 SW2 2 CRC 4 multiframe Off Disabled SW2 3 Data Inversion Off Data Not Inverted SW2 4 V 54 CSU select Off V 54 RDL loop SW2 5 FPS enabled Off Enabled SW2 6 V 54 Response ON Disabled SW2 7 Not Used Off N A SW2 8 Not Used Off N A 3 15 18 SWITCH SW2 1 LINE CODING HDB3 DEFAULT Use Switch SW2 1 to control the Network Line Coding options Set these options to be the same as the Line Coding given to you by your Service Provider If you are using two MT334As together as short range modems set both units to HDB3 sW2 1 Line Encoding Off HDB3 On AMI Options HDB3 AMI HDB3 In this line coding the transmitter substitutes a deliberate bipolar viola tion when excessive zeros in the data stream are detected The receiver recog nizes these special violations and decodes them as zeros This method enables the network to meet minimum pulse density requirements Unless AMI is re
7. are present the local modem s red ER LED will blink sporadically 2 If the above test indicates no errors are present move the V 52 toggle switch DOWN activating the 511 E test with errors present If the test is working properly the local modem s red ER LED will blink once per second A successful 5 11 E test will confirm that the link is in place and that the MT334A s built in 511 generator and detector are working properly Note The above V 52 BER tests can be used independently of the Remote Dig ital Loopback tests This requires two operators one to initiate and mon itor the tests at the local MT334A and one to do the same at the remote MT334A In this case the test pattern sent by each MT334A will not be looped back but will be transmitted down the line to the other MT334A While one operator initiates test the other monitors for errors G 703 G 704 NTU W 10BASET A G 703 G 704 specifications A 1 Network Data Rate 2 048 Mbps A 2 Network Connector RJ 48C Dual Coax BNC A 3 Nominal Impedance 75 120 ohm A 4 Line Coding Selectable AMI or HDB3 A 5 Line Framing G 703 Unframed or G 704 G 732 Framed A 6 CRC 4 Multiframing Selectable On or Off A 7 Clocking Internal or Network Receive Recover A 8 Time Slot Rate 64 kbps G 703 G 704 NTU W 10BASET A 9 Network Data Rates 64 128 192 256 320 384 448 512 576 640 704 768 832 896 960 1024 1088 1152 1216
8. clear channel E1 G 703 2 048 Mbps data from the telco s digital data network The MT334A terminates the G 703 telco interface and converts the data for transmission to a user oriented 10Base T 802 3 Ethernet interface The MT334A supports an integrated 10Base T 802 3 Ethernet port with trans parent bridging capability for IP IPX DECnet NetBIOS and other layer 3 proto cols The MT334A attaches to the LAN and intelligently bridges data traffic to the large central site router through the telco s leased line network The MT334A supports PPP RFC 1661 and BCP RFC 1638 The MT334A is a 10Base T bridge that operates over G 703 G 704 lines It uses MAC learning and forwarding to provide seamless LAN to LAN connectivity A MA G 703 G 704 NTU W 10BASET As a result corporate enterprises can connect their servers to a pair of NTUs and automatically forward data packets that are meant for the remote network Local packets are filtered and passed only to the local LAN G 703 G 704 NTU W 10BASET 2 PPP Operational Background PPP is a protocol used for multiplexed transport over a point to point link PPP operates on all full duplex media and is a symmetric peer to peer protocol which can be broken into three main components A standard method to encap sulate datagrams over serial links 2 A Link Control Protocol LCP to establish configure and test the data link connection 3 A family of Network Control Pro tocols N
9. features configuration capability via hardware DIP switches This section describes all possible DIP switch configurations of the MT334A 3 15 DIP Switch Configuration The MT334A has two sets of internal DIP switches that allow configuration for a wide range of applications The sets of switches are accessed from the underside Figure 3 shows the location of the DIP switches on the bottom of the printed cir cuit board Rear OFF ELLE S1 ran s2 ON O Front j J Figure 3 Underside of MT334A Showing Location of DIP Switches The MT334A DIP switches Switch Sets 1 2 can be configured as either ON or OFF Figure 4 shows the orientation of the DIP switches with respect to ON OFF positions 12384567 8 ow ee 4 y Oa y NANO E OFF QO orr Figure 4 Close up of configuration switches o G 703 G 704 NTU W 10BASET 3 15 16 SWITCH SW1 1 THROUGH SW1 5 A detailed description of each switch SW1 1 through SW1 5 setting follows the summary table below SWITCH SET 1 SUMMARY TABLE Position Function Factory Default Selected Option SW1 1 DTE Rate Off SW1 2 DTE Rate Off ene Mope SW1 3 DTE Rate Off oe SW1 4 DTE Rate Off ene SW1 5 DTE Rate Off SW1 6 Clock Mode Off Receive Recov
10. installer may disable the front panel switches Set Switch S2 5 to determine whether the front panel toggle switches are active or inactive SW2 5 Option Off Front Panel Switches Enabled On Front Panel Switches Disabled 3 15 23 SWITCH SW2 6 V 54 RESPONSE DISABLED DEFAULT V 54 is a special in band loopback facility that sends a pseudo random pattern over the data stream This is the only loopback that the unit can initiate This is useful for campus applications when you need to put a remote unit in loopback The unit responds to the V 54 loopback command and the whole process takes only a few seconds to complete When V 54 Loopback is disabled the unit will not be able to respond to V 54 loopback commands SW2 6 Option Off V 54 Response Enabled On V 54 Response Disabled G 703 G 704 NTU W 10BASET 4 Installation Once the MT334A is properly configured it is ready to connect to the G 703 G 704 interface to the Ethernet port and to the power source This section describes how to make these connections 4 16 Connecting to the G 703 network The Power G 703 G 704 and Ethernet Line connections are located on the rear panel of the MT334A Figure 5 shows the location of each of these ports RX 75 Ohm Line 120 Ohm pie TX 75 Ohm Data to network Ethernet Power Figure 5 MT334A Rear Panel 4 16 24 CONNECTING DUAL COAXIAL CABLE 75 OHM TO THE G 703 NETWORK The MT
11. lt gt BLACK BOX Tee MARCH 2006 MT334A G 703 G 704 NTU w 10BaseT SSBLACK BOX 724 746 5500 Link EL 1087 status LOS eo _ Zx lt _ _ _ _ _L_ E E X a Eo I a a DSSS 0 CUSTOMER Order toll free in the U S 24 hours 7 A M Monday to midnight Friday 877 877 BBOX SUPPORT FREE technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 INFORMATION Mail order Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com G 703 G 704 NTU W 10BASET CE NOTICE The CE symbol on your Black Box equipment indicates that it is in compliance with the Electromagnetic Compatibility EMC directive and the Low Voltage Directive LVD of the European Union EU A Certificate of Compliance is available by contacting Technical Support RADIO AND TV INTERFERENCE The Multi Rate Ethernet Extender generates and uses radio frequency energy and if not installed and used properly that is in strict accordance with the manu facturer s instructions may cause interference to radio and television reception The Multi Rate Ethernet Extender has been tested and found to comply with the limits for a Class A computing device in accordance with specifications in Sub part B of Part 15 of FCC rules which are designed to provide reasonable protec tion from such interference in a commercial installation However there is no guarante
12. 1280 1344 1408 1472 1536 1600 1664 1728 1792 1856 1920 1984 2048 kbps A 10 Distance Maximum 1 8 km 6 000 ft on 24 AWG Cable G 703 G 704 NTU W 10BASET B Ethernet 10Base T specifications B 1 DTE Interface 10Base T on RJ 45F B 2 DTE Data Rates 10Mbps B 3 LAN Connection RJ 45 10Base T 802 3 Ethernet B 4 Protocol PPP RFC 1661 with Bridging Control RFC 1638 B 5 MAC Address Table Size 4096 entries B 6 MAC Address Aging MAC addresses deleted after 8 minutes of inactivity B 7 Frame Buffer 512 Frames B 8 Frame Latency 1 frame B 9 Diagnostics V 54 Loopback CSU Loopback V 52 Patterns 511 B 10 Indicators E 1 Link 10Base T Link Ethernet Status Loss of Frame Sync Error Test Mode LE G 703 G 704 NTU W 10BASET B 11 Configuration Two 8 Position DIP Switches B 12 Power Supply 5VDC external power supply 100 240VAC 50 60Hz 0 4A B 13 Relative Humidity Up to 90 non condensing B 14 Temperature 0 to 70 C B 15 Dimensions 9 0 x 5 3 x 2 0 cm 3 5L x 2 1 W x 0 78 H G 703 G 704 NTU W 10BASET Notes lt gt BLACK BOX Copyright 2006 Black Box Corporation All rights reserved ng gn nee 1000 Park Drive Lawrence PA 15055 1018 724 746 5500 Fax 724 746 0746
13. 334A is equipped with dual female BNCs TX and RX for connection to a 75 ohm dual coax G 703 network interface If your G 703 G 704 network ter minates via dual coaxial cable use the diagram below to make the proper con nections See figure 5 on page 18 e G 703 G 704 NTU W 10BASET Note The outer conductor of the coax cables are isolated from system earth ground When using the 75 Ohm interface jumper straps JP2 JP5 JP6 and JP7 must be installed over the jumpers The jumpers are located next to the BNC connectors Refer to the following section to open the case Open the case and install jumper straps for JP2 JP5 JP6 and JP7 4 16 25 OPENING THE CASE Open the case by inserting a screwdriver into the slots and twist the screwdriver head slightly The top half of the case will separate from the lower half of the case Take caution not to damage any of the PC board mounted components 4 16 26 CONNECTING THE TWISTED PAIR 120 OHM TO THE G 703 NETWORK The MT334A is equipped with a single RJ 48C jack for connections to a 120 ohm twisted pair G 703 G 704 network interface If your G 703 G 704 network terminates via RJ 48C use the connection diagram see Figure 6 following the pinout and signals chart below to connect the 120 ohm G 703 G 704 network channel RJ 45 Cable 8 Wire G 703 G 704 Network signal PIN MT334A signal RX TX RX TX TX TX RX RX Shield Shield No Connection No Connection No Con
14. CPs to establish and configure different network layer protocols In order to establish communications over a point to point link each end of the PPP link must first announce its capabilities and agree on the parameters of the link s operation This exchange is facilitated through LCP Configure Request packets Once the link has been established and optional facilities have been negotiated PPP will attempt to establish a network protocol PPP will use Network Control Protocol NCP to choose and configure one or more network layer protocols Once each of the network layer protocols have been configured datagrams from the established network layer protocol can be sent over the link The link will remain configured for these communications until explicit LCP or NCP packets close the link down or until some external event occurs The PPP Bridging Control Protocol BCP defined in RFC 1638 configures and enables disables the bridge protocol on both ends of the point to point link BCP uses the same packet exchange mechanism as the Link Control Protocol LCP BCP is a Network Control Protocol of PPP bridge packets may not be exchanged until PPP has reached the network layer protocol phase 2 14 Applications In situations where a routed network requires connectivity to a remote Ethernet network the interface on a router can be configured as a PPP IP Half Bridge The serial line to the remote bridge functions as a Virtual Ethernet interfac
15. d with default Peer ID consisting of the units Ethernet MAC address and a password which consists of the unit s Ethernet MAC address Some networking systems do not define network numbers in packets sent out over a network If a packet does not have a specific destination network number a router will assume that the packet is set up for the local segment and will not for ward it to any other sub network However in cases where two devices need to communicate over the wide area bridging can be used to transport non routable protocols G 703 G 704 NTU W 10BASET Figure 2 illustrates transparent bridging between two routers over a serial inter face sO Bridging will occur between the two Ethernet Interfaces on Router A e0 and el and the two Ethernet Interfaces on Router B e0 and el MT334A no ip routing Router A interface EthernetO A N ip address 1 1 1 1 255 255 255 0 A bridge group 1 Using Bridge Groups multi amp f ple remote LANs can be Y interface SerialO ip address 1 1 1 1 255 255 255 0 Y encapsulation PPP Router B Ss bridge group 1 Sm bridged over the wide area interface Serial1 ip address 2 2 2 2 255 255 255 0 e0 amazin bridge group 1 LAN LAN yy QA Serial Interface bridge 1 protocol ieee A A ho ho MT334A E1 FE1 Link Figure 2 Transparent bridging between two routers over a serial interface G 703 G 704 NTU W 10BASET 3 Configuration The MT334A
16. e effec tively extending the routers serial port connection to the remote network The bridge device sends bridge packets BPDUs to the router s serial interface The router will receive the layer three address information and will forward these packets based on its IP address G 703 G 704 NTU W 10BASET Figure shows a typical router with a serial interface configured as a PPP Half Bridge The router serial interface uses a remote device that supports PPP bridg ing to function as a node on the remote Ethernet network The serial interface on the router will have an IP address on the same Ethernet subnet as the bridge MT334A Bridge Customer s Site Service Provider s Network PEC Device with serial interface Figure 1 Router with serial interface configured as PPP Half Bridge For example the customer site is assigned the addresses 192 168 1 0 24 through 192 168 1 1 24 The address 192 168 1 1 24 is also the default gateway for the remote network The above settings remove any routing forwarding intelligence from the CPE The associated router configuration will set serial interface s0 to accommodate half bridging for the above example Authentication is optional under PPP In a point to point leased line link incom ing customer facilities are usually fixed in nature therefore authentication is gen erally not required If the foreign device requires authentication via PAP or CHAP the PPP software will respon
17. e ser usado nicamente con carritos o pedestales que sean recomendados por el fabricante El aparato el ctrico debe ser montado a la pared o al techo s lo como sea recomendado por el fabricante Servicio El usuario no debe intentar dar servicio al equipo el ctrico m s all a lo descrito en las instrucciones de operaci n Todo otro servicio deber ser referido a personal de servicio calificado El aparato el ctrico debe ser situado de tal manera que su posici n no interfi era su uso La colocaci n del aparato el ctrico sobre una cama sof alfombra o superficie similar puede bloquea la ventilaci n no se debe colocar en libre ros o gabinetes que impidan el flujo de aire por los orificios de ventilaci n El equipo el ctrico deber ser situado fuera del alcance de fuentes de calor como radiadores registros de calor estufas u otros aparatos incluyendo amplificadores que producen calor o A G 703 G 704 NTU W 10BASET 11 El aparato el ctrico deber ser connectado a una fuente de poder s lo del tipo descrito en el instructivo de operaci n o como se indique en el aparato 12 13 14 15 16 17 18 Precauci n debe ser tomada de tal manera que la tierra fisica y la polarizaci n del equipo no sea eliminada Los cables de la fuente de poder deben ser guiados de tal manera que no sean pisados ni pellizcados por objetos colocados sobre o contra ellos poniendo particular atenci n a los contact
18. e that interference will not occur in a particular installation If the Ether net Extender does cause interference to radio or television reception which can be determined by disconnecting the unit the user is encouraged to try to correct the interference by one or more of the following measures moving the comput ing equipment away from the receiver re orienting the receiving antenna and or plugging the receiving equipment into a different AC outlet such that the com puting equipment and receiver are on different branches G 703 G 704 NTU W 10BASET FCC PART 68 The MT334A is not intended to be connected to the pub lic telephone network Caution TRADEMARKS USED IN THIS MANUAL All applied for and registered trademarks are the property of their respective owners NORMAS OFICIALES MEXICANAS NOM ELECTRICAL SAFETY STATEMENT Instrucciones De Seguridad 1 10 Todas las instrucciones de seguridad y operaci n deber n ser le das antes de que el aparato el ctrico sea operado Las instrucciones de seguridad y operaci n deber n ser guardadas para ref erencia futura Todas las advertencias en el aparato el ctrico y en sus instrucciones de operaci n deben ser respetadas Todas las instrucciones de operaci n y uso deben ser seguidas El aparato el ctrico no deber ser usado cerca del agua por ejemplo cerca de la tina de ba o lavabo s tano mojado o cerca de una alberca etc El aparato el ctrico deb
19. ered SW1 7 Clock Mode Off Receive Recovered SW1 8 Not Used N A N A Use Switches SW1 5 to set the DTE data rate sw sw2 SW3 SWA4 SW5 Speed On On On On On 64 kbps Off On On On On 128 kbps On Off On On On 192 kbps Off Off On On On 256 kbps On On Off On On 320 kbps Off On Off On On 384 kbps On Off Off On On 448 kbps Off Off Off On On 512 kbps On On On Off On 576 kbps Off On On Off On 640 kbps On Off On Off On 704 kbps Off Off On Off On 768 kbps On On Off Off On 832 kbps Off On Off Off On 896 kbps On Off Off Off On 960 kbps Off Off Off Off On 1024 kbps On On On On Off 1088 kbps Off On On On Off 1152 kbps o MA G 703 G 704 NTU W 10BASET sw sw2 SW3 sw4 SW5 Speed On Off On On Off 1216 kbps Off Off On On Off 1280 kbps On On Off On Off 1344 kbps Off On Off On Off 1408 kbps On Off Off On Off 1472 kbps Off Off Off On Off 1536 kbps On On On Off Off 1600 kbps Off On On Off Off 1664 kbps On Off On Off Off 1728 kbps Off Off On Off Off 1792 kbps On On Off Off Off 1856 kbps Off On Off Off Off 1920 kbps On Off Off Off Off 1984 kbps Off Off Off Off Off Clear Channel 2048 kbps Note When the data rate is set to 2 048Mb s then the unit is forced into G 703 mode and it transmits user data on all 32 time slots There is no framing information therefore the CRC4 MF SW2 2 switch is ignored In all other rate settings the unit employs G 704 framing
20. eresreererrereersee 9 2 3 AppliCations essar ein bot Siti a dida 9 3 CONTRUCCION cda 12 3 4 DIP Switch Configuration oooconccnonnnoncnnnnonnoncnoncnnnonncnnnonnconncnnccnncn nens 12 3 4 1 Switch SW1 1 through SW1 5 oooooonoccncccconccoonacoccconnnonaccnnnnonos 13 3 4 2 SW1 6 and SW1 7 Clock Modes ocoooocconoocccoonnnoconcconononononnnos 14 3 4 3 Switch SW2 1 Line Coding HDB3 DEFAULT 15 3 4 4 Switch SW2 2 CRC 4 Multiframe ooooooooccnonocncoooncnoonncnnnnoos 16 3 4 5 Switch SW2 3 Data Inversion coocccnnoocccooonncnoncnnnonnncnnnnnncnnnos 16 3 4 6 Switch SW2 4 Remote Digital Loopback Type 16 3 4 7 Switch SW2 5 Front Panel SwitchesS oooooocoocccinoccccoocnncnnnos 17 3 4 8 Switch SW2 6 V 54 Response Disabled DEFAULT 17 4 Installation iii 18 4 5 Connecting to the G 703 netwoTK oooconcninnnnnnocnnonconnconcnnncononncinnonnnos 18 4 5 9 Connecting dual coaxial cable 75 ohm to the 6703 NETWOLK vicioni ncici erase aiii 18 4 5 10 Opening the CaSe cenean aeter Eent ECE EE EMEN EES 19 4 5 11 Connecting the twisted pair 120 ohm to the G 703 Network AA iiie ea ei ates 19 4 6 Connecting the 10Base T Ethernet port to a PC DTE 000000 20 4 7 Connecting the 10Base T Ethernet port to a hub ue 20 4 8 Power connection cecceecsseeceseceessseeceeseeecsececesueecseeeeecseeeneeeeeseeees 21 De OPE TAUON ON 22 S9 POWOL UD a E henh cates hotee han be aed es au eet hse A tits 22
21. lecting local loop on the front panel switch 2 Perform a V 52 BER bit error rate test as described in section Using the V 52 BER Test Pattern Generator on page 26 If the BER test equipment indicates no faults but the data terminal indicates a fault follow the manu facturer s checkout procedures for the data terminal Also check the inter face cable between the terminal and the MT334A 5 22 28 OPERATING REMOTE DIGITAL LOOPBACK RL The Remote Digital Loopback RL test checks the performance of both the local and remote MT334A as well as the communication link between them Any characters sent to the remote MT334A in this test mode will be returned back to the originating device G 703 G 704 NTU W 10BASET G 703 G 704 NTU 50 Sen Network MT334A Receive Ethernet Internal Recover Ethernet Device Clocking Clocking Device Clock Glock Data Data ea i Data MT334A Figure 12 Remote Loop in a Network Extension Application There are two Remote Loops that can be initiated from the MT334A MT334A unit 1 V 54 Loop and 2 CSU Loop The user can select the type of loop that can be initiated by Switch S2 4 When a loopback is initiated this is the type of loop that the unit uses to loop up the remote unit and which type of loop the unit will respond to To perform an RDL test follow these steps 1 Activate RDL This may be done by setting the front panel switch to Remote
22. med mode the LOS LED monitors the status of the transmit clock ER The error LED indicates various error conditions including framing bit errors excessive zeros controlled slips severe errors or bit errors when sending V 52 test patterns When sending a test pattern the LED will remain lit if the unit does not receive the identical pattern When it receives the correct pattern the LED will turn off If error insertion is on the LED will blink once a second if everything is operating properly TM Active Yellow Solid Yellow indicates an Active Test Mode The unit may be placed in test mode by the local user or by the remote user ne A G 703 G 704 NTU W 10BASET 5 22 Loop V 54 amp Telco diagnostics The MT334A offers three V 54 loop diagnostics Use these diagnostics to test the NTU and any communication links These tests can be activated via the front panel switches 5 22 27 OPERATING LOCAL LOOPBACK LL The Local Loopback LL test checks the operation of the local MT334A and is performed separately on each unit 2Mbps G 703 G 703 G 704 NTU Network MT334A Receive 2Mbps G 703 All Switches Internal aed Ethernet Network set to OFF locking ocking Device Cable Span Clock Data Clock Data MT334A Figure 11 Local Loopback for a Network Termination Application To perform a LL test do the following 1 Activate LL This may be done by se
23. nection TX TX No Connection RX RX Shield Shield NMOL ODN OO NW j 042010 00 Figure 6 G 703 G 704 170 Ohm Connection G 703 G 704 NTU W 10BASET 1 TD data output from MT334A 2 TD data output from MT334A 3 RD data input to MT334A 4 no cin a no connection Z 6 RD data input to MT334A a 7 no connection 8 no connection HN MM Figure 7 Connecting the 10Base T Ethernet Port to a PC 4 17 Connecting the 10Base T Ethernet port to a PC DTE The 10Base T interface is configured as DTE Data Terminal Equipment If the MT334A is to connect to another DTE device such as a 10Base T network inter face card construct a 10Base T crossover cable and connect the wires as shown in Figure 8 10BaseT Port 10Base T DTE RJ 45 Pin No RJ 45 Pin No 1 TD 1 TD 2 TD 2 TD 3 RD 3 RD 6 RD 6 RD Figure 8 10Base T cross over cable connection 4 18 Connecting the 10Base T Ethernet port to a hub The 10Base T interface is configured as DTE Data Terminal Equipment just like a 10Base T network interface card in a PC Therefore it expects to connect to a 10Base T Hub using a straight through RJ 45 cable Use Figure 9 to con struct a cable to connect the 10Base T interface to a 10Base T Hub 10BaseT Port 10Base T Hub RJ 45 Pin No RJ 45 Pin No 1 TD 1 RD 2 TD 2 RD 3 RD
24. os y recept culos donde salen del aparato El equipo el ctrico debe ser limpiado nicamente de acuerdo a las recomen daciones del fabricante En caso de existir una antena externa deber ser localizada lejos de las lineas de energia El cable de corriente deber ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo Cuidado debe ser tomado de tal manera que objectos liquidos no sean derra mados sobre la cubierta u orificios de ventilaci n Servicio por personal calificado deber ser provisto cuando A B D El cable de poder o el contacto ha sido da ado u Objectos han ca do o l quido ha sido derramado dentro del aparato o El aparato ha sido expuesto a la lluvia o El aparato parece no operar normalmente o muestra un cambio en su desempe o o El aparato ha sido tirado o su cubierta ha sido da ada G 703 G 704 NTU W 10BASET CONTENTS CE NOECE ics irs ci cath Se ei tates a seen 2 Radio and TV Interference eeecceccsseceseeceeesnecesesaeeceescessseecesaeeseseeeess 2 FOG Patt 08 e are loi Nate erute dt E EE EE ETERRA EE 3 Trademarks Used In This Manual ccccccsssssceseseeeceeceeesseeeeesneeesseeeees 3 Normas Oficiales Mexicanas NOM Electrical Safety Statement 3 I General information amenas 7 Wels Features E Shs E eet E PE GAG E ets 7 12 D scri phon DENT 7 2 PPP Operational Background eseseesesseesesseesesreererrererrsserrssr
25. quired in your application HDB3 should be used whenever possible AMI Alternate Mark Inversion defines a pulse as a mark a binary one as opposed to a zero In an El network connection signals are transmitted as a sequence of ones and zeros Ones are sent as pulses and zeros are sent as spaces i e no pulse Every other pulse is inverted from the previous pulse in polarity so that the signal can be effectively transmitted This means however that a long sequence of zeros in the data stream will cause problems since the NTU receiv ing the signal relies on the signal to recover the 2 048 Mb s clock BO MA G 703 G 704 NTU W 10BASET If you must use AMI you should ensure that the data terminal equipment con nected to the unit provides a minimally acceptable pulse density For this reason there are advantages to using HDB3 instead AMI coding does not inherently account for ones density To meet this requirement the user should ensure that the data inherently meets pulse density requirements 3 15 19 SWITCH SW2 2 CRC 4 MULTIFRAME In framed mode SW2 2 is used for CRC 4 MF When CRC 4 is enabled the unit monitors the incoming data stream for CRC 4 errors It transmits CRC 4 error counts to the transmitting unit When using timeslot zero TSO excessive errors may cause loss of frame or loss of sync If CRC 4 MF is used both units must be set for set for CRC 4 MF Otherwise the one using CRC 4 MF will detect loss of sync
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