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Summary of Contents for LaserBit LE-820M/1E1 Plus
- Page 1 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...
- Page 2 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.
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Page 3: Limited Warranty
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. -
Page 4: About This Guide
About This Guide This manual provides all the information required to install, configure, and use LE-820M/1E1 Plus and LE-1300S/1E1 Plus E1 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. -
Page 5: Table Of Contents
Table of Contents 1. Introduction .......................6 1.1 General Description..................6 1.2 Theory of operation ..................6 2. Installation .......................13 3. Configuration....................14 3.1 Location of connectors and indicators............14 3.2 E1 Plus unit internal module arrangement ............15 3.3 Configuration Jumpers – E1SC-MM ............15 3.4 Configuration Jumpers – E1SC-UIM............18 3.5 Service channel configuration settings (S1, S2)..........19 4. -
Page 6: Introduction
1. Introduction 1.1 General Description The E1 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) interface to optical networks. The converters give fully transparent connection both for structured or unstructured signals at E1 (2.048 Mbps) level. - Page 7 The E1SC-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 E1SC-MM (Media converter and Multiplexer) module, which multiplexes the service channels and the incoming E1 data onto a 2.5 Mb/s digital stream then converts it to optical signals.
- Page 8 CPLD logic The CPLD (Complex Programmable Logic Device) is the heart of the E1 Plus unit. The two major functions of this block is to multiplex/demultiplex the E1 data and the service channel data and to perform the encoding and decoding of the optical serial data.
- Page 9 Management Interface The management 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 E1 line status.
- Page 10 E1SC-UIM (User Interface Module) 20.48 MHz Analogue Audio Display Channel RS-232 FPGA Switches Interface logic Status and Control Bits Serial remote control bus Figure 3. E1SC-UIM Function Blocks CS1 System connector All 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.
- Page 11 The CS4 multiplexed digital data connector is a ten-pin interface provides interconnection between E1SC-MM (Media converter and Multiplexer) and the E1SC-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.
- Page 12 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.
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Page 13: Installation
2. Installation The step-by-step procedure of installing the E1 Plus converter is explained in the followings. Configuration Before connecting the E1 Plus device to the E1 and optical network, the operating parameters for the desired configuration should be set up. These parameters should match with the connected E1 equipment and network parameters and can be set up by DIP switches and jumpers. -
Page 14: Configuration
3. Configuration Before connecting the E1 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... -
Page 15: E1 Plus Unit Internal Module Arrangement
3.2 E1 Plus unit internal module arrangement E1SC-MM E1SC-UIM 3.3 Configuration Jumpers – E1SC-MM J9 J10 J11 J12... - Page 16 Jitter attenuator settings (J1, J2, J3) Jitter attenuator disabled The jitter attenuation circuit is placed in the receiver paths of copper side* 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.
- Page 17 TX Logic GND 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. RX Logic GND Signal input is not connected to the logic ground* Signal output is connected to the logic ground.
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Page 18: Configuration Jumpers - E1Sc-Uim
3.4 Configuration Jumpers – E1SC-UIM Switch block S1, S2 Power source selector (JP2) Locally stabilized voltage (+5V)* Incoming voltage (+5V) Handset MIC polarity Panasonic type handset* Siemens type handset... -
Page 19: Service Channel Configuration Settings (S1, S2)
3.5 Service channel configuration settings (S1, S2) Factory setting : 0 0 0 0 0 0 0 0 1 0 1 0 0 1 1 0 SerIn StopBit BPC1 RefClkSel BPC2 LocalLoop ParOdd Parity ClkMaster Baud1 Baud2 Init_on_Error Baud3 RemoteControl HWControl StationAddress: SerIn: Method of handling the inbound 24 bit low speed signaling data... - Page 20 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 S1[7] – A9 … S2[8] – A0 HWControl: RTS/CTS flow control OFF – Flow control disabled* ON –...
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Page 21: Technical Specifications
4. Technical specifications E1 Line Interface: G.703 Nominal bit rate: 2048 kbit/s ± 50 ppm Bit rate tolerance: Line code: AMI/HDB3 Connector: BNC 75 Ohm/RJ-45 120 Ohm Optical 820 nm multimode TX Power: -15 dBm (min) RX Sensitivity: -31 dBm Connector: ST multimode 1300 nm single mode:... - Page 22 RS-232 serial channel Type of traffic flow: serial, asynchronous, duplex Speed: 300/600/1200/2400/9600/19200/38400 bit/s ± 4 % Speed tolerance: Number of data bits: 5/6/7/8 Number of start bits: Number of stop bits: 1/1.5/2 Parity: Odd/Even/No parity Flow control: HW (RTS/CTS)/No flow control Interface: Connector: DB-9, male...
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Page 23: Port Pinouts
5. Port Pinouts Serial RS-232 (DB-9 male) Signal Function Data Carrier Detected Received Data Transmitted Data Data Terminal Ready Signal Ground Data Set Ready Request To Send Clear To Send Ring Indicator Handset (RJ-11) Signal Function Handset MIC Handset receiver Handset receiver Handset MIC E1 (RJ-45) - Page 24 Alarm Signal and Management INPUT (DB-37) Signal Function Electrical 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...
- Page 25 Alarm Signal and Management OUTPUT (DB-37) Signal Function Electrical Signal ground BO-0 Status and control input Open Collector BO-1 Status and control input Open Collector BO-2 Status and control input Open Collector BO-3 Status and control input Open Collector BO-4 Status and control input Open Collector BO-5...
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Page 26: Led Description
6. LED Description All the status LED’s are located in the front panel of the E1 Plus unit. The indicators are arranged into four groups according 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. - Page 27 Service channel Error – Error 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.
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Page 28: Appendix A - E1 Background
Appendix A E1 background The invention of the telephone in 1876 (A.G. 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. - Page 29 Timeslots 1 to 31 Channels 1 to 31 Frame Synchronization In 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 Timeslots 1 to 15 Timeslots 17 to 31 Frame...
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Page 30: Appendix B - Characteristics Of The Pdh System
Appendix B Characteristics of the PDH system. Characteristics 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 µs 1/b=1/8000/s=125 µs Number of bits in each code word Telephone channel bit rate b x d=8000/s x 8 bit... -
Page 31: Appendix C - Summary Of Pdh Transmission Rates
Appendix C Summary of PDH transmission rates. 397200 kb/s 564992 kb/s 97728 kb/s 274176 kb/s 139264 kb/s 32064 kb/s 44736 kb/s 34368 kb/s 6312 kb/s 8448 kb/s 1544 kb/s 2048 kb/s x 24 x 30 64 kb/s... -
Page 32: Appendix D - Glossary
Appendix D GLOSSARY A bit remote (or distant) alarm indicator Alarm Indication Signal Alternate Mark Inversion Asynchronous Transfer Mode Bit Error Ratio Channel Associated Signaling CRC-4 Cyclic Redundancy Check for 2048kbit/s Systems 2048kbit/s PCM communication system mainly used in Europe E&M Exchange and Multiplex signaling Frame Alignment Signaling...
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