LaserBit LE-820M/1E1 Plus, LE-1300S/1E1 Plu, LE-1300S/1E1 Plus User Manual

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.: [phone]
Fax: [phone]
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
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changes in content from time to time without obligation on the part of LaserBit
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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 Corp. 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.

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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 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
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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
warranties and remedies 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 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. For the sake
of simplicity the naming convention “E1 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 – 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

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. Technical specifications ..................................................................................21

5. Port Pinouts......................................................................................................23

6. LED Description..............................................................................................26

Appendix A – E1 Background ............................................................................28

Appendix B - Characteristics of the PDH system. ..............................................30

Appendix C - Summary of PDH transmission rates ...........................................31

Appendix D - GLOSSARY .................................................................................32

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. 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 E1 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 E1 Plus converter is to transmit and receive E1 signal
over fiber optic networks. In addition to that, the equipment is capable of
transmitting auxiliary service data on top of the standard E1 data stream. The
two functions are realized by two independent functional units inside the device
as it is shown on Figure 1 below.

A – RS-232 serial, duplex, up to 38.400 kbps
B – Analogue voice channel, 16 kbps ADPCM

–

E1

Fiber optic link

E1SC-MM

SC-UIM

E1SC-MM

SC-UIM

E1

A

B

C

A

B

C

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. 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 E1 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. (E1SC-MM) and Figure 3. (SC-UIM) E1SC­MM (Media converter and Multiplexer).

Figure 2. E1SC-MM Function Blocks

E1 line interface

The E1 line interface provides physical connection to the E1 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.

Master
CLK

CPLD

logic

E1 line
inter­face

FO
transmitter

FO
receiver

PLL
circuits

SC-IF

J Tag

DIP
SW

Manage­ment
interface

Front
panel

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.

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 E1 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 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.

DIP SW

The configuration switch block contains 8 micro switches used to select line
coding, E1 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 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.

Operation

The E1 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 E1
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 E1 data and the
recovered clock to the E1 line interface. The service channel data is passed to
the service channel module. The E1 line interface module encodes the data
received from the CPLD block using AMI or HDB3 coding and transmits the E1
signal out to the G.703 port.

E1SC-UIM (User Interface Module)

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.

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.

Serial remote control bus

CS1

S3

S4

CS3

CS2

Analogue
Audio
Channel

RS-232
Interface

Status and
Control
Bits

20.48 MHz
VCO

FPGA

logic

CS4

DIP
Switches

LED
Display