User`s Manual
Contents
1. aserm M C A E1 Fiber Optic Converter with Service Channel Interface LE 820M 1E1 Plus LE 1300S 1E1 Plus User s Manual Rev 2 0 LaserBit Communications Corp 1037 Budapest Kunigunda u 45 HUNGARY Tel 36 1 4537440 Fax 36 1 2403570 www laserbitcommunications com Copyright Statement Copyright 2000 LaserBit Communications Corp All rights reserved No part of this documentation may be reproduced in any form or by any means or used to make any derivative work such as translation transformation or adoption without written permission from LaserBit Communications Corp LaserBit Communications Corp reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of LaserBit Communications Corp to provide notification of such revision or change LaserBit Communications Corp provides this documentation without warranty term or condition of any kind either implied or expressed including but not limited to the implied warranties terms of conditions of merchantability satisfactory quality and fitness for a particular purpose LaserBit Communications Corp may make improvements or changes in the product s described in this documentation at any time Trade Marks LaserBit is a registered trade mark of LaserBit Communications Corp All other trademarks belong to their respective owners Limited Warranty LaserBit Communications Corp2. Appendix Summary of PDH transmission rates 397200 kb s 564992 kb s x4 x4 x3 x6 Pd x4 wmm x 5 x7 x4 x4 EN x4 CUM 2048 kb s x 24 x 30 64 kb s Appendix D GLOSSARY A bit remote or distant alarm indicator AIS Alarm Indication Signal AMI Alternate Mark Inversion ATM Asynchronous Transfer Mode BER Bit Error Ratio CAS Channel Associated Signaling CRC 4 Cyclic Redundancy Check for 2048kbit s Systems El 2048kbit s PCM communication system mainly used in Europe E amp M Exchange and Multiplex signaling FAS Frame Alignment Signaling G 703 ITU T Recommendation for Physical Electrical Characteristic for Hierarchical Digital Interfaces HDB3 High Density Bipolar code with a maximum of 3 zeros ISDN Integrated Services Digital Network ITU T International Telecommunication Union Telecommunications Standardization Section MFAS Multiframe Alignment Signal NFAS Not Frame Alignment Signal NMFAS Not Multiframe Alignment Signal PAM Pulse Amplitude Modulation PCM Pulse Code Modulation PCM30 30 channels with CAS signaling in timeslot 16 PCM30C 30 channels with CAS signaling in timeslot 16 and CRC error checking PCM31 31 channels PCM31C 31 channels with CRC error checking PDH Plesiosynchronous Digital Hierarchy SDH Synchronous Digital Hierarchy S Q signal to quantizing noise SONET Synchronous Optical Network Tl 1544kbit s PCM communication system mainly used USA Canada and Japan Y bit distant multiframe
3. lists the equipment s specifications Port pinouts provides pinout data for the equipment s ports Glossary provides the meaning for some networking terms used in this manual Table of Contents J EntkoQdu OE DOR MER E RPM UT 6 WE General CSE TIP EON ouai 6 I 2 THEORY OOP eration cnn UU 6 2c MAS fal att OM edd Sd b oe bdo n ires 13 Se OMIT OUR ALL OM enon es te ee adir PR SR GE 14 3 1 Location of connectors and indicators 14 3 2 El Plus unit internal module arrangement 15 3 3 Configuration Jumpers EISC MM 15 3 4 Configuration Jumpers EISC UIM 18 3 5 Service channel configuration settings S1 S2 19 4 Technical specifications nn ae feet p bred dte RS 21 NN a Re 23 DIES CU i Mises os saat tto eerie de tetes 26 Appendix Background ss 28 Appendix Characteristics of the PDH system 30 Appendix C Summary of PDH transmission rates 31 Appendix D GLOSSARY nan trees es 32 1 Introduction 1 1 General Description The Plus fiber optic converter LE 820M 1E1 Plus and LE 1300S 1E1 Plus products from LaserBit Communications offer cost effective and highly reliable solution for connecting equipment with ITU T G 703 E1 i
4. turning any of to S4 switches to hook on position FPGA logic The FPGA Field Programmable Gate Array is the central controlling and processing unit of the service channel module It gathers the RS 232 asynchronous serial data the analogue voice channel and the alarm and control signals together and converts them into a synchronous 64 kb s digital data stream using unique framing and error correction protocol After turning the equipment ON the FPGA downloads its operating code which takes approximately 100 ms Afterwards it initializes the voice channel and the RS 232 circuits based on the DIP switch configuration The FPGA uses clock signals from the EISC MM module to start the multiplexed digital channel the receive and the transmit clock is independent from each other As soon as the circuits are synchronized the EISC UIM is ready to work Analogue Audio Channel An ADPCM codec is used to convert the analogue voice signals into a 16 kbps digital data and vice versa RS 232 Interface The asynchronous serial interface is controlled by an UART chip The parameters of the communication are set by DIP switches and can be changed remotely too Status and Control Bits The 2x24 bits low speed signaling can be used to monitor or control remote equipments alarm systems etc The signals are sampled and refreshed in every 8 ms The RX and TX sides are independent both can be set up for either serial or parallel operation The n
5. a PCM30 system the frame comprises of 30 timeslots used for traffic and 2 code words that are used for synchronization and signaling purposes Timeslots 1 to 15 Timeslots 17 to 31 l Timeslots 1 to 15 Timeslots 17 to 31 Frame Signaling Synchronization PDH has two primary communication systems as its foundation These are the system based on 1544 kbps that is recommended by ANSI and the system based on 2048 kbps that is recommended by ITU T The 1 system 15 used mainly in the USA Canada and Japan European and certain non European countries use the El system Appendix Characteristics of the system Characteristics EI 1 Sampling frequency 8000 Hz 8000 Hz Number of samples per 8000 per second 8000 per second telephone signal Length of PCM frame 1 b 1 8000 s 125 us 1 b 1 8000 s 125 us Number of bits in each code word 8 8 Telephone channel bit rate b x d 8000 s x 8 bit 64 kbit s b x d 8000 s x 8 bit 64 kbit s Encoding decoding A law u law Number of segments in 13 15 characteristic Number of timeslots per 32 24 PCM frame Number of bits per PCM 8 32 1 8 24 frame 256 bits 1 193 bits Length of an 8 bit timeslot cxd h cxd h 125 us x 8 256 125 us x 8 193 approx 3 9 Us approx 5 2 Us Bit rate of time division bxh bxh multiplexed signal 8000 s x 256 bits 8000 s x 193 bits 2048 kbit s 1544 kbit s
6. warrants that the LaserBit product purchased will free from defects in material and workmanship for a period of one 1 year from the date of purchase This warranty period will not be extended by virtue of a repair of the product or a replacement of any component of the product during the warranty period This warranty covers only normal commercial use LaserBit Communications Corp is not responsible for warranty service should the LaserBit identification marks serial numbers or original seals be removed altered or broken or should the product fail to be properly maintained or fail to function properly as a result of any modification misuse abuse improper installation neglect improper shipping damage caused by disasters such as fire flood earthquake or lightning improper electrical current or service other than by LaserBit Communications Corp or its authorized partners If the LaserBit product fails to operate as warranted at any time during the warranty period LaserBit Communications Corp will repair or at its option replace the defective product at no additional charge In no event will LaserBit Communications Corp be liable for any damages including loss of data lost profits lost savings lost business or other incidental or consequential or indirect damages arising out of the installation use maintenance performance failure or interruption of the LaserBit product even if LaserBit Communications Corp has been advised of
7. O 19 BO 20 BO 21 BO 22 BO 23 N A N A N A N A RES RXS LOOP GND N A N A N A N A Alarm Signal and Management OUTPUT DB 37 Function Signal ground Status and control input Status and control input Status and control input Status and control input Status and control input Status and control input Status and control input Status and control input Status and control input Status and control input Status and control input Status and control input Status and control input Status and control input Status and control input Status and control input Status and control input Status and control input Status and control input Status and control input Status and control input Status and control input Status and control input Status and control input Remote sync loss output Local sync loss output Dual Loop input Signal ground Electrical Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector Open Collector 6 LED Description All the status LED s are located in the front panel of the El Plus unit The indicators are arranged into four groups accordin
8. System connector signals of the SC UIM are available on this 96 pin connector Two DB 37 connectors are used to make these signals accessible on the rear side of the unit CS2 DB 9 connector for RS 232 connection situated on the front side of the equipment CS3 RJ 11 connector for telephone handset connection placed on the front side of the equipment CS4 The CS4 multiplexed digital data connector is a ten pin interface provides interconnection between EISC MM Media converter and Multiplexer and the EISC UIM User Interface Module It carries synchronous duplex 64 kbps data which contains the RS 232 asynchronous serial data the analogue voice channel and the alarm and control signals S3 Analogue voice channel momentary push button Pushing the button will cause the buzzer of the remote unit to buzz until the button is released This button is used to warn the remote side to switch its S4 switch to hook on position after a conversation is finished S4 Analogue voice channel hook switch used to initiate a voice call The normal position of the switch is hook on If it is switched to hook off position the buzzer of the remote device start buzzing while the green status LED starts blinking at both sides After changing the position of the switch at the remote side to hook off the buzzer will stop and both LED s change to steady green The voice communication channel is now open The channel can be close by
9. XC and TXC Init_on_Error behavior of the signaling bits on ERROR condition OFF all bits keep their previous state ON all bits become inactive RemoteControl RS 232 configuration mode OFF configuration through S1 S2 switches ON configuration through the internal control bus future extension Multifunction Switches S1 7 8 S2 1 8 If RemoteControl OFF S1 7 N A S1 8 S2 1 8 RS 232 configuration switches If RemoteControl ON S1 7 8 S2 1 8 Station address for remote management SI 7 A9 S2 8 AO HWControl RTS CTS flow control OFF Flow control disabled ON Flow control enabled Baudl Baud2 Baud3 RS 232 baud rate 000 300 Baud 001 600 Baud 010 1200 Baud 011 2400 Baud 1 00 4800 Baud 101 9600 Baud 110 19200 Baud 111 38400 Baud Parity parity handling on the RS 232 line OFF Parity checking and parity bit generation 15 disabled ON Parity checking and parity bit generation is enabled ParOdd Parity selection OFF Odd Parity ON Even Parity BCP1 BCP2 Character length 00 5 bits character 01 6 bits character 10 7 bits character 11 8 bits character StopBit Number of stop bits OFF 1 stop bit in case of 5 bits character 1 5 stop bit ON 2 stop bits 4 Technical specifications E1 Line Interface Nominal bit rate Bit rate tolerance Line code Connector Optical 820 nm multimode TX Power RX Sensitivity Connector 1300 nm s
10. alarm bit
11. demands for higher transmission rates with better quality and the advent of semiconductor circuits other techniques were developed In the 1960s digital systems started to appear Here the telephone channels are separated by time using a new type of transmission method known as Pulse Code Modulation PCM The analogue signal speech from the telephone is first converted to a Pulse Amplitude Modulated PAM signal using a process called sampling Then using quantization and encoding this sampled analogue PAM signal is converted to a digital PCM signal Based on the principle above the Plesiochronous Digital Hierarchy PDM has been developed Here the 300 3400 Hz band limited analogue signal is sampled at 8000 Hz Then the PAM signals are quantized using a 13 segment compression characteristic known as A law in systems 15 segment u law characteristic is used Finally the signal is encoded using an 8 bit code word format This source coding produces 8 bit code words at a rate of 8 kHz giving 64 kbps data rate To improve the utilization of the transmission medium the signals are transmitted by time division multiplexing where the code words are interleaved and contained in a PCM frame A primary frame consists of 32 code words called timeslots which are numbered 0 to 31 A PCM31 frame comprises of 31 timeslots used for traffic and 1 timeslot used for synchronization Timeslots 1 to 31 Channels 1 to 31 Frame Synchronization In
12. emedies are exclusive and are in lieu of all other warranties expressed or implied either in fact or by operation of law statutory or otherwise including warranties of merchantability and fitness for a particular purpose LaserBit Communications Corp neither assumes nor authorizes any other person to assume for it any other liability in connection with the sale installation use or maintenance of the product About This Guide This manual provides all the information required to install configure and use LE 820M 1E1 Plus and LE 1300S 1E1 Plus El to fiber optic converters The above two models are identical in their functionality with the only difference being in their optical interface While the LE 820M 1E1 Plus has multimode optical interface operating at 820 nm wavelength the LE 13001E1 Plus has single mode fiber optic interface operating at 1300 nm wavelength For the sake of simplicity the naming convention El Plus will be used to cover both models throughout this guide The manual is intended for use by personnel familiar with telecommunication networks consequently it assumes basic knowledge of telecom networks and ITU T G 703 concepts Overview of the User s Manual Introduction provides general information about the E1 Plus Installation helps to understand and install the E1 Plus Configuration explains all available settings on the E1 Plus and what options exist for configuration and use Specifications
13. ex up to 38 400 kbps B Analogue voice channel 16 kbps ADPCM C Low sneed alarm and control signals 2 x 24 El The EISC UIM User Interface Module gathers the RS 232 asynchronous serial data the analogue voice channel and the alarm and control signals together and converts them into a synchronous 64 kb s digital data stream using unique framing and error correction protocol This data is then passed to the EISC MM Media converter and Multiplexer module which multiplexes the service channels and the incoming 1 data onto a 2 5 Mb s digital stream then converts it to optical signals At the opposite side the optical signals are converted back to electrical de multiplexed and the data is passed to the corresponding interfaces that is 1 to the line interface and service channels to the SC UIM module The SC UIM module decodes the 64 kb s digital data and converts it back to RS 232 serial analogue voice and low speed signaling More detailed information about the functional blocks inside the individual modules can be seen on Figure 2 EISC MM and Figure 3 SC UIM E1SC MM Media converter and Multiplexer Figure 2 EISC MM Function Blocks line interface The El line interface provides physical connection to the El network via balanced 120 Ohm UTP or unbalanced 75 Ohm coaxial ports It provides data and clock recovery AMI HDB3 encoding and decoding AIS and BPV detection CPLD logic The CPLD Complex Program
14. f it is required by the network operator DIP Switch settings SW1 12345678 on AAA Switch No ON OFF 1 AMI HDB3 2 El line loop back Normal Operation 3 Optical loop back Normal Operation 4 8 N A N A Asterisk denotes factory setting 3 4 Configuration Jumpers E1SC UIM JP2 m gt LaserBit Switch block SC UIM 51 82 Power source selector JP2 JP2 Locally stabilized voltage 5V 2 Incoming voltage 5V Handset MIC polarity JP1 i i Panasonic type handset JPI Siemens type handset 3 5 Service channel configuration settings S1 S2 Factory setting 00000000 10100110 StopBit BPC1 BPC2 LocalLoop ParOdd Parity ClkMaster Baudl Init on Error Baud2 na Baud3 RemoteControl HWControl StationAddress A9 A8 A7 A6 A5 A4 A3 A2 Al AO SerIn Method of handling the inbound 24 bit low speed signaling data OFF 24 signaling bits are taken from the parallel input ON 24 signaling bits are taken from the serial input RefCIkSel Reference Closk Source selection for the ADPCM PLL OFF data channel receive clock RXC ON data channel transmit clock TXC LocalLoop Local Loop Mode selection OFF Normal mode ON Test mode ClkMaster Receive and Transmit clock source OFF Normal Mode incoming RXC and TXC ON Test Mode internal R
15. g to their function as detailed below Power The power LED green lights when power supplied to the device that is the unit is connected to the appropriate power source and the power switch on the rear panel is switched on Optical Tx Transmit indicator green this LED lights up when the device is transmitting on its optical port RX Receive indicator green this LED shows the presence of an optical signal on the RX side of the optical port Rx S Loss Receive Sync Loss red this LED lights when the unit has lost the sync of the incoming signal on the optical port Re S Loss Remote Sync Loss red this LED indicates that the remote unit is sending Sync Loss Frames which means it has lost the sync on its optical side Equipment Tx Transmit indicator green this LED lights up when the device is transmitting on its port If the signals are reversed on the G 703 port e g the transmitter is connected to the opposite transmitter the indicator is blinking If the device detects a short circuit on the TX line the LED goes out Rx Receive indicator green this LED lights up when the device is receiving valid data on its G 703 interface SLS Signal loss red this LED indicates that there is no signal present on the RX side of the 1 port AIS ones red this LED is turned on when the equipment is receiving AIS signals on the El line interface Service channel Error Er
16. ingle mode TX Power RX Sensitivity Connector Common Digital data stream Type of traffic flow Speed Interface Analogue voice channel Frequency range Codec Characteristic A law Relevant standard Connector G 703 2048 kbit s 50 ppm AMI HDB3 BNC 75 Ohm RJ 45 120 Ohm 15 dBm min 31 dBm ST multimode 18 dBm min 31 dBm ST single mode serial synchronous duplex 64 kbit s TTL compatible 200 3400 Hz ADPCM 16 kbit s ITU T G 726 RJ 11 RS 232 serial channel Type of traffic flow Speed Speed tolerance Number of data bits Number of start bits Number of stop bits Parity Flow control Interface Connector serial asynchronous duplex 300 600 1200 2400 9600 19200 38400 bit s 4 5 6 7 8 1 1 1 5 2 Odd Even No parity HW RTS CTS No flow control DTE DB 9 male Status and control signals 2x24 bits Type of traffic flow Number of data bits Serial data clock Sampling period Parallel data input Parallel data output System Power Dimensions WxDxH Operating temperature Storage temperature Humidity serial synchronous duplex parallel 24 8 kHz 8 ms TTL compatible Open collector 30 V 40 mA 110 VAC 230 VAC 48 VDC 435 x 206 x 65 mm 1 5 U 0 50 C 20 50 C 0 95 non condensed 5 Port Pinouts Serial RS 232 DB 9 male DCD Data Carrier Detected RXD Received Data TXD Transmitted Data DTR Data Ter
17. interface provides information about the local and remote frame sync loss and can be used to set the device to dual loop back mode Front Panel The Front Panel gives information about the actual status of the equipment including power optical and 1 line status Operation The El line interface receives the G 703 data recovers the clock from the signal decodes the data and detects AIS or BPV errors The recovered clock and data then passed to the CPLD logic This programmable electronics receives the El data and clock and the service channel data multiplexes them into a 2 5 Mbps synchronous data stream This data stream is then encoded for optical transmission and passed to the FO transmitter which converts the electrical signals to optical In the opposite direction the optical signal is received by the FO receiver converted to electrical and transmitted to the CPLD block The CPLD decodes the data stream demultiplexes it and sends the 1 data and the recovered clock to the 1 line interface The service channel data is passed to the service channel module The El line interface module encodes the data received from the CPLD block using AMI or HDB3 coding and transmits the El signal out to the G 703 port E1SC UIM User Interface Module 20 48 MHz Analogue LED Audio Display Channel DIP RS 232 Switches Interface Status and Control Bits Serial remote control bus Figure 3 EISC UIM Function Blocks CSI
18. mable Logic Device is the heart of the E1 Plus unit The two major functions of this block is to multiplex demultiplex the El data and the service channel data and to perform the encoding and decoding of the optical serial data PLL Phase Locked Loop circuits Three independent PLL s are used by the CPLD logic for the encoding and decoding of the optical serial data FO transmitter receiver The fiber optics transmitter and receiver convert the electrical signals to optical and the optical to electrical respectively Master Clock The Master Clock is used as a reference clock source when the device looses the sync on the 1 side By doing so the service and management communication between the two E1 Plus units is not affected by the sync loss SC IF The Service Channel Interface is the interconnection between EISC MM Media converter and Multiplexer and the EISC UIM User Interface Module It carries synchronous duplex 64 kbps data which contains the RS 232 asynchronous serial data the analogue voice channel and the alarm and control signals DIP SW The configuration switch block contains 8 micro switches used to select line coding El line loop back and fiber loop back J Tag The J Tag is the test interface of the CPLD logic through which the functionality of the electronics can be checked The same interface is used to download the new operating code to re program the CPLD Management Interface The management
19. minal Ready GND Signal Ground DSR Data Set Ready RTS Request To Send CTS Clear To Send RI Ring Indicator Handset MIC Handset receiver Handset receiver Handset MIC RJ 45 RX A Data Receive A RX Data Receive B GND Ground TX A Data Transmit A TX B Data Transmit B GND Ground N A N A Alarm Signal and Management INPUT DB 37 Pin Signal Function Electrical GND Signal ground BI 0 Status and control input BI 1 Status and control input BI 2 Status and control input BI 3 Status and control input BI 4 Status and control input BI 5 Status and control input BI 6 Status and control input BI 7 Status and control input BI 8 Status and control input BI 9 Status and control input BI 10 Status and control input BI 11 Status and control input BI 12 Status and control input BI 13 Status and control input BI 14 Status and control input BI 15 Status and control input BI 16 Status and control input BI 17 Status and control input BI 18 Status and control input BI 19 Status and control input BI 20 Status and control input BI 21 Status and control input BI 22 Status and control input BI 23 Status and control input RPHGC Phone ring contact common RPHGO Phone ring contact open RPHGI Phone ring contact closed N A N A N A N A N A N A N A N A N A Pin Signal GND BO 0 1 BO 2 BO 3 BO 4 BO 5 BO 6 BO 7 BO 8 BO 9 BO 10 BO 11 BO 12 BO 13 BO 14 BO 15 BO 16 BO 17 BO 18 B
20. nectors and indicators Service channel On hook RS 232 port Power LED status LED s switch Optical line E1 line Attention push RJ 11 phone status LED s status LED s button handset Figure 4 Plus unit front panel SW 1 IN 703 1 conf switch DIP SW DB 37 RJ 11 ST Power MGM OUT G 703 Fiber port connector DB 37 BNC Fuses Power Figure 5 EI Plus unit rear panel 3 2 1 Plus unit internal module arrangement 12 13 14 J5 J6 Jitter attenuator settings J1 J2 J3 Jitter attenuator disabled ee J3 The jitter attenuation circuit is placed in the receiver paths of copper side ee The jitter attenuation circuit is placed in the transmit paths of copper side These three jumpers must not be installed together in the same time only one of them E1 line settings J4 J5 J6 J9 J10 J11 J12 75 Ohm balanced operation J9 J10 J11 J12 m EN 120 Ohm unbalanced operation J9 J10 J11 J12 m EE ee 56 Line equalization J7 J8 ee ee Factory setting do not change TX Logic GND 13 J13 RX Logic GND J14 i J14 Signal output is not connected to the logic ground Signal output is connected to the logic ground Use this setting if it is required by the network operator Signal input is not connected to the logic ground Signal output is connected to the logic ground Use this setting i
21. nterface to optical networks The converters give fully transparent connection both for structured or unstructured signals at El 2 048 Mbps level The devices are designed to be extremely flexible yet easy to use The copper line interface is configurable both for balanced UTP and unbalanced COAX connection Copper and fiber loop back modes provide useful help in troubleshooting The loop back modes also can be turned on and monitored remotely Color LED indicators provide extended status and alarm reporting The selectable line coding and AIS handling gives further flexibility when integrating the equipment into an existing system The 1 Plus models are equipped with Service Channel feature which transmits one voice channel one RS 232 channel and 2 x 24 low speed signal bits on top of the data stream This solution makes the equipment ideal for applications where alarm and status monitoring or remote management of other equipment is required Besides the AC Power Supply the devices can be ordered with 48 VDC PSU for Telco applications 1 2 Theory of operation The basic function of the El Plus converter is to transmit and receive EI signal over fiber optic networks In addition to that the equipment is capable of transmitting auxiliary service data on top of the standard El data stream The two functions are realized by two independent functional units inside the device as it is shown on Figure 1 below El A RS 232 serial dupl
22. ot used inputs and outputs can be left un terminated The inputs can be connected to TTL HCMOS compatible source and are protected from static electricity and voltage overload The outputs can be connected to relays or TTL HCMOS compatible devices and maximum load should not exceed 30 V or 40 mA DIP Switches The configuration switches of the EISC UIM are used to set up the operational parameters of the RS 232 interface the status and controlling signal channels and the 64 kbps digital channel LED Display There are three LED indicators showing the actual state of the service channel unit including initialization loop back and voice channel status 2 Installation The step by step procedure of installing the 1 Plus converter is explained in the followings Configuration Before connecting the El Plus device to the El and optical network the operating parameters for the desired configuration should be set up These parameters should match with the connected El equipment and network parameters and can be set up by DIP switches and jumpers The jumpers and part of the DIP switches are situated inside the unit and will become accessible only after removing the cover of the unit Please see the Configuration section of this manual for more details Line Connection After making sure that the settings of the equipment are appropriate for the current configuration the El line can be connected to the selected interface If you use
23. ror indicator red if the ERROR LED is steadily ON it means that the FPGA circuit could not download its operational code Its blinking status indicates that other initialization error happened Loop Loop back indicator yellow this LED lights up when the device is turned into loop back mode Speak Voice channel status indicator green when this LED is turned ON the voice channel between the local and remote equipment is UP When it blinks it indicates that call initiation from the remote site is in progress Appendix E1 background The invention of the telephone in 1876 Bell has completely changed the world Today it would be difficult for us to imagine our life without the telephone Even these days with the ever growing number of computer networks and the booming Internet voice communication still forms the major part of the total volume of the communication traffic In the early days each telephone connection required a dedicated link all the way between two users Shortly after the steadily growing number of subscribers led to the development of various methods and technologies which enabled several telephone connections to be transmitted over a single cable Most of the systems at that time used Frequency Division Multiplexing FDM technology Here the idea was to modulate each telephone channel with a different carrier frequency to shift the signals into different frequency ranges With ever increasing
24. the possibility of such damage If you purchased the LaserBit product in the United States some states do not allow the limitation or exclusion of liability for incidental or consequential damages so the above limitation may not apply to you The purchaser or user shall have the responsibility to give LaserBit Communications Corp prompt written notice of any warranty claims If the product was purchased through an authorized partner of LaserBit Communications Corp notice may be given in writing to that authorized partner in the area in which the product was being used The product may be returned to LaserBit Communications Corp only if it has a Return Material Authorization RMA number The product must be shipped prepaid insured and in the original shipping package or similar package for safe shipment The RMA number must be marked on the outside of the shipping package Any product returned without an RMA number shall be rejected Transportation charges for the return of the product will be paid by LaserBit Communications Corp if it is determined by LaserBit Communications Corp that the product was defective within the terms of the warranty otherwise the purchaser or user shall be responsible for costs of return handling and transportation If the LaserBit product does not operate as warranted above the customer s sole remedy shall be at LaserBit Communications Corp s option repair or replacement The foregoing watranties and r
25. the unbalanced interface please pay attention to the TX RX directions When the balanced interface is used compare the pinout specification of E1 Plus unit and the 1 equipment to be connected and use a proper cable for the interconnection Fiber Connection Verify that the connectors of the equipment and the optical network are compatible Connect the TX side of the opposite unit to the RX port and the RX side of the remote device to the TX port of the local equipment Power connection The 1 converter can be ordered with three different power supply options 230 VAC 110 VAC and 48VDC Check your unit before connecting it to the power source Incorrect power connection can cause permanent damage to the equipment After all the cable connections are arranged turn the power switch to ON position The Power LED on the front side of the unit should be on and if the cable connections were made properly and the connected equipments are operational the RX and TX status LED s should light both on the and copper side 3 Configuration Before connecting the 1 Plus device to the G 703 network it should be configured to work properly with the local E1 equipment All E1 Plus units are pre configured in the factory with the following settings G 703 interface Line interface Unbalanced 75 Ohm BNC connection Line coding HDB3 Service channel RS 232 interface 9600 8 1 NP Voice port Panasonic handset 3 1 Location of con
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