LaserBit LE-820M/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.
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particular purpose. LaserBit Communications Corp. may make improvements or changes in
the product(s) described in this documentation at any time.
Trade Marks
LaserBitis 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
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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,
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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
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The product may be returned to LaserBit Communications Corp. only if it has a Return
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Corp. if it is determined by LaserBit Communications Corp. that the product was defective
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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
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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
C
–
Low speed alarm and control signals, 2 x 24
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) E1SC-
MM (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
inter-
face
FO
transmitter
FO
receiver
PLL
circuits
SC-IF
J Tag
DIP
SW
Manage-
ment
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

CS4
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.
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
turning any of the 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 E1SC-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 E1SC-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 not 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 E1SC-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 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. 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.
E1 Line Connection
After making sure that the settings of the equipment are appropriate for the
current configuration, the E1 line can be connected to the selected interface. If
you use the unbalanced interface, please pay attention to the TX/RX directions.
When the balanced interface is used, compare the pinout specification of the E1
Plus unit and the E1 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 E1 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 E1 and copper
side.

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
Voice port: Panasonic handset
3.1 Location of connectors and indicators
Figure 4. E1 Plus unit front panel
Figure 5. E1 Plus unit rear panel
Power LED
RS-232 port
RJ-11 phone
handset
On-hook
switch
“Attention” push
button
Service channel
status LED’s
E1 line
status LED’s
DB-37
MGM IN
DB-37
MGM OUT
BNC
G.703
RJ-11
G.703
SW 1
E1 conf.
DIP SW
ST
Fiber port
Fuses Power
switch
Power
connector
Optical line
status LED’s

3.2 E1 Plus unit internal module arrangement
3.3 Configuration Jumpers – E1SC-MM
PSU E1SC-MM E1SC-UIM
J1
J2
J3
J4
J5
J6
J9 J10 J11 J12
J13
J7
J8
J14
SW1

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.
E1 line settings (J4, J5, J6, J9, J10, J11, J12)
75 Ohm balanced operation*
120 Ohm unbalanced operation
Line equalization (J7, J8)
Factory setting, do not change.
J1
J2
J3
J1
J2
J3
J1
J2
J3
J4
J5
J6
J9 J10 J11 J12
J4
J5
J6
J9 J10 J11 J12
J7
J8

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. Use this
setting if it is required by the network operator.
DIP Switch settings (SW1)
Switch No. ON OFF
1 AMI HDB3*
2 E1 line loop back Normal Operation*
3 Optical loop back Normal Operation*
4-8 N/A N/A
Asterisk (*) denotes factory setting.
J
1
3
J
14
J13
J14
On
12345678

3.4 Configuration Jumpers – E1SC-UIM
Power source selector (JP2)
Locally stabilized voltage (+5V)*
Incoming voltage (+5V)
Handset MIC polarity
Panasonic type handset*
Siemens type handset
Switch block
S1, S2
J
P1
J
P2
J
P2
J
P2
JP1
JP1

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: 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
RefClkSel: 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 RXC 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)
1
StationAddress:
2
ON
S2
1
A4
83
A2
5
BPC1
RefClkSel
A1
ClkMaster
HWContro
l
A5 A0
RemoteControl
Baud2
7
Baud3
Baud1
3
ParOdd
A7A9
56
ON
BPC2
4
SerIn
A6
Parity
72 6
S1
8
StopBit
LocalLoop
A3
4
A8
Init_on_Error

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 – Flow control enabled
Baud1, Baud2, Baud3: RS-232 baud rate
0 0 0 300 Baud
0 0 1 600 Baud
0 1 0 1200 Baud
0 1 1 2400 Baud
1 0 0 4800 Baud
1 0 1 9600 Baud*
1 1 0 19200 Baud
1 1 1 38400 Baud
Parity: parity handling on the RS-232 line
OFF – Parity checking and parity bit generation is disabled*
ON – Parity checking and parity bit generation is enabled
ParOdd: Parity selection
OFF – Odd Parity*
ON – Even Parity
BCP1, BCP2: Character length
0 0 5 bits / character
0 1 6 bits / character
1 0 7 bits / character
1 1 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