Installation and Operation Manual
FOM-E1/T1
E1/T1 Fiber Optic Modem
FOM-E1/T1
E1/T1 Fiber Optic Modem
Installation and Operation Manual
Notice
This manual contains information that is proprietary to RAD Data Communications Ltd. ("RAD"). No
part of this publication may be reproduced in any form whatsoever without prior written approval by
RAD Data Communications.
Right, title and interest, all information, copyrights, patents, know-how, trade secrets and other
intellectual property or other proprietary rights relating to this manual and to the FOM-E1/T1 and any
software components contained therein are proprietary products of RAD protected under international
copyright law and shall be and remain solely with RAD.
FOM-E1/T1 is a registered trademark of RAD. No right, license, or interest to such trademark is granted
hereunder, and you agree that no such right, license, or interest shall be asserted by you with respect
to such trademark.
You shall not copy, reverse compile or reverse assemble all or any portion of the Manual or the FOME1/T1. You are prohibited from, and shall not, directly or indirectly, develop, market, distribute,
license, or sell any product that supports substantially similar functionality as the FOM-E1/T1, based on
or derived in any way from the FOM-E1/T1. Your undertaking in this paragraph shall survive the
termination of this Agreement.
This Agreement is effective upon your opening of the FOM-E1/T1 package and shall continue until
terminated. RAD may terminate this Agreement upon the breach by you of any term hereof. Upon
such termination by RAD, you agree to return to RAD the FOM-E1/T1 and all copies and portions
thereof.
For further information contact RAD at the address below or contact your local distributor.
International Headquarters
RAD Data Communications Ltd.
24 Raoul Wallenberg St.
Tel Aviv 69719 Israel
Tel: 972-3-6458181
Fax: 972-3-6498250
E-mail: rad@rad.co.il
© 1987–2002 RAD Data Communications Ltd. Publication No. 284-200-01/03
U.S. Headquarters
RAD Data Communications Inc.
900 Corporate Drive
Mahwah, NJ 07430 USA
Tel: (201) 529-1100, Toll free: 1-800-444-7234
Fax: (201) 529-5777
E-mail: market@radusa.com
Limited Warranty
RAD warrants to DISTRIBUTOR that the hardware in the FOM-E1/T1 to be delivered hereunder shall
be free of defects in material and workmanship under normal use and service for a period of twelve
(12) months following the date of shipment to DISTRIBUTOR.
If, during the warranty period, any component part of the equipment becomes defective by reason of
material or workmanship, and DISTRIBUTOR immediately notifies RAD of such defect, RAD shall have
the option to choose the appropriate corrective action: a) supply a replacement part, or b) request
return of equipment to its plant for repair, or c) perform necessary repair at the equipment's location.
In the event that RAD requests the return of equipment, each party shall pay one-way shipping costs.
RAD shall be released from all obligations under its warranty in the event that the equipment has been
subjected to misuse, neglect, accident or improper installation, or if repairs or modifications were
made by persons other than RAD's own authorized service personnel, unless such repairs by others
were made with the written consent of RAD.
The above warranty is in lieu of all other warranties, expressed or implied. There are no warranties
which extend beyond the face hereof, including, but not limited to, warranties of merchantability and
fitness for a particular purpose, and in no event shall RAD be liable for consequential damages.
RAD shall not be liable to any person for any special or indirect damages, including, but not limited to,
lost profits from any cause whatsoever arising from or in any way connected with the manufacture,
sale, handling, repair, maintenance or use of the FOM-E1/T1, and in no event shall RAD's liability
exceed the purchase price of the FOM-E1/T1.
DISTRIBUTOR shall be responsible to its customers for any and all warranties which it makes relating
to FOM-E1/T1 and for ensuring that replacements and other adjustments required in connection with
the said warranties are satisfactory.
Software components in the FOM-E1/T1 are provided "as is" and without warranty of any kind. RAD
disclaims all warranties including the implied warranties of merchantability and fitness for a particular
purpose. RAD shall not be liable for any loss of use, interruption of business or indirect, special,
incidental or consequential damages of any kind. In spite of the above RAD shall do its best to provide
error-free software products and shall offer free Software updates during the warranty period under
this Agreement.
RAD's cumulative liability to you or any other party for any loss or damages resulting from any claims,
demands, or actions arising out of or relating to this Agreement and the FOM-E1/T1 shall not exceed the
sum paid to RAD for the purchase of the FOM-E1/T1. In no event shall RAD be liable for any indirect,
incidental, consequential, special, or exemplary damages or lost profits, even if RAD has been advised of
the possibility of such damages.
This Agreement shall be construed and governed in accordance with the laws of the State of Israel.
General Safety Instructions
The following instructions serve as a general guide for the safe installation and operation of
telecommunications products. Additional instructions, if applicable, are included inside the manual.
Safety Symbols
This symbol may appear on the equipment or in the text. It indicates
potential safety hazards regarding product operation or maintenance to
operator or service personnel.
Warning
Danger of electric shock! Avoid any contact with the marked surface while
the product is energized or connected to outdoor telecommunication lines.
.
Warning
Protective earth: the marked lug or terminal should be connected to the building
protective earth bus.
Some products may be equipped with a laser diode. In such cases, a label
with the laser class and other warnings as applicable will be attached near
the optical transmitter. The laser warning symbol may be also attached.
Please observe the following precautions:
• Before turning on the equipment, make sure that the fiber optic cable is
intact and is connected to the transmitter.
• Do not attempt to adjust the laser drive current.
• Do not use broken or unterminated fiber-optic cables/connectors or look
straight at the laser beam.
• The use of optical devices with the equipment will increase eye hazard.
• Use of controls, adjustments or performing procedures other than those
specified herein, may result in hazardous radiation exposure.
ATTENTION: The laser beam may be invisible!
Always observe standard safety precautions during installation, operation and maintenance of this
product. Only qualified and authorized service personnel should carry out adjustment, maintenance or
repairs to this product. No installation, adjustment, maintenance or repairs should be performed by
either the operator or the user.
Handling Energized Products
General Safety Practices
Do not touch or tamper with the power supply when the power cord is connected. Line voltages may
be present inside certain products even when the power switch (if installed) is in the OFF position or a
fuse is blown. For DC-powered products, although the voltages levels are usually not hazardous,
energy hazards may still exist.
Before working on equipment connected to power lines or telecommunication lines, remove jewelry
or any other metallic object that may come into contact with energized parts.
Unless otherwise specified, all products are intended to be grounded during normal use. Grounding is
provided by connecting the mains plug to a wall socket with a protective earth terminal. If an earth lug
is provided on the product, it should be connected to the protective earth at all times, by a wire with a
diameter of 18 AWG or wider. Rack-mounted equipment should be mounted only in earthed racks
and cabinets.
Always make the ground connection first and disconnect it last. Do not connect telecommunication
cables to ungrounded equipment. Make sure that all other cables are disconnected before
disconnecting the ground.
Connection of AC Mains
Make sure that the electrical installation complies with local codes.
Always connect the AC plug to a wall socket with a protective ground.
The maximum permissible current capability of the branch distribution circuit that supplies power to
the product is 16A. The circuit breaker in the building installation should have high breaking capacity
and must operate at short-circuit current exceeding 35A.
Always connect the power cord first to the equipment and then to the wall socket. If a power switch is
provided in the equipment, set it to the OFF position. If the power cord cannot be readily
disconnected in case of emergency, make sure that a readily accessible circuit breaker or emergency
switch is installed in the building installation.
Connection of DC Mains
Unless otherwise specified in the manual, the DC input to the equipment is floating in reference to the
ground. Any single pole can be externally grounded.
Due to the high current capability of DC mains systems, care should be taken when connecting the DC
supply to avoid short-circuits and fire hazards.
DC units should be installed in a restricted access area, i.e. an area where access is authorized only to
qualified service and maintenance personnel.
Make sure that the DC supply is electrically isolated from any AC source and that the installation
complies with the local codes.
The maximum permissible current capability of the branch distribution circuit that supplies power to
the product is 16A. The circuit breaker in the building installation should have high breaking capacity
and must operate at short-circuit current exceeding 35A.
Before connecting the DC supply wires, ensure that power is removed form the DC circuit. Locate the
circuit breaker of the panel board that services the equipment and switch it to the OFF position. When
connecting the DC supply wires, first connect the ground wire to the corresponding terminal, then the
positive pole and last the negative pole. Switch the circuit breaker back to the ON position.
A readily accessible disconnect device that is suitably rated and approved should be incorporated in
the building installation.
Connection of Data and Telecommunications Cables
Data and telecommunication interfaces are classified according to their safety status.
The following table lists the status of several standard interfaces. If the status of a given port differs from
the standard one, a notice will be given in the manual.
Ports Safety Status
V.11, V.28, V.35, V.36, RS-530,
X.21, 10 BaseT, 100 BaseT,
Unbalanced E1, E2, E3, STM, DS-2,
DS-3, S-Interface ISDN, Analog voice
E&M
xDSL (without feeding voltage),
Balanced E1, T1, Sub E1/T1
FXS (Foreign Exchange Subscriber) TNV-2 Telecommunication Network Voltage-2:
FXO (Foreign Exchange Office), xDSL
(with feeding voltage), U-Interface
ISDN
SELV Safety Extra Low Voltage:
Ports which do not present a safety hazard. Usually
up to 30 VAC or 60 VDC.
TNV-1 Telecommunication Network Voltage-1:
Ports whose normal operating voltage is within the
limits of SELV, on which overvoltages from
telecommunications networks are possible.
Ports whose normal operating voltage exceeds the
limits of SELV (usually up to 120 VDC or telephone
ringing voltages), on which overvoltages from
telecommunication networks are not possible. These
ports are not permitted to be directly connected to
external telephone and data lines.
TNV-3 Telecommunication Network Voltage-3:
Ports whose normal operating voltage exceeds the
limits of SELV (usually up to 120 VDC or telephone
ringing voltages), on which overvoltages from
telecommunication networks are possible.
Always connect a given port to a port of the same safety status. If in doubt, seek the assistance of a
qualified safety engineer.
Always make sure that the equipment is grounded before connecting telecommunication cables. Do
not disconnect the ground connection before disconnecting all telecommunications cables.
Some SELV and non-SELV circuits use the same connectors. Use caution when connecting cables.
Extra caution should be exercised during thunderstorms.
When using shielded or coaxial cables, verify that there is a good ground connection at both ends. The
earthing and bonding of the ground connections should comply with the local codes.
The telecommunication wiring in the building may be damaged or present a fire hazard in case of
contact between exposed external wires and the AC power lines. In order to reduce the risk, there are
restrictions on the diameter of wires in the telecom cables, between the equipment and the mating
connectors.
Caution
To reduce the risk of fire, use only No. 26 AWG or larger telecommunication line cords.
Attention
Pour réduire les risques s’incendie, utiliser seulement des conducteurs de
télécommunications 26 AWG ou de section supérieure.
Some ports are suitable for connection to intra-building or non-exposed wiring or cabling only. In such
cases, a notice will be given in the installation instructions.
Do not attempt to tamper with any carrier-provided equipment or connection hardware.
Electromagnetic Compatibility (EMC)
The equipment is designed and approved to comply with the electromagnetic regulations of major
regulatory bodies. The following instructions may enhance the performance of the equipment and will
provide better protection against excessive emission and better immunity against disturbances.
A good earth connection is essential. When installing the equipment in a rack, make sure to remove all
traces of paint from the mounting points. Use suitable lock-washers and torque. If an external
grounding lug is provided, connect it to the earth bus using braided wire as short as possible.
The equipment is designed to comply with EMC requirements when connecting it with unshielded
twisted pair (UTP) cables. However, the use of shielded wires is always recommended, especially for
high-rate data. In some cases, when unshielded wires are used, ferrite cores should be installed on
certain cables. In such cases, special instructions are provided in the manual.
Disconnect all wires which are not in permanent use, such as cables used for one-time configuration.
The compliance of the equipment with the regulations for conducted emission on the data lines is
dependent on the cable quality. The emission is tested for UTP with 80 dB longitudinal conversion loss
(LCL).
Unless otherwise specified or described in the manual, TNV-1 and TNV-3 ports provide secondary
protection against surges on the data lines. Primary protectors should be provided in the building
installation.
The equipment is designed to provide adequate protection against electro-static discharge (ESD).
However, it is good working practice to use caution when connecting cables terminated with plastic
connectors (without a grounded metal hood, such as flat cables) to sensitive data lines. Before
connecting such cables, discharge yourself by touching earth ground or wear an ESD preventive wrist
strap.
FCC-15 User Information
This equipment has been tested and found to comply with the limits of the Class A digital device,
pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and used in
accordance with the Installation and Operation manual, may cause harmful interference to the radio
communications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his own expense.
Canadian Emission Requirements
This Class A digital apparatus meets all the requirements of the Canadian Interference-Causing
Equipment Regulation.
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel
brouilleur du Canada.
Warning per EN 55022 (CISPR-22)
Warning
Avertissement
Achtung
This is a class A product. In a domestic environment, this product may cause
radio interference, in which case the user will be required to take adequate
measures.
Cet appareil est un appareil de Classe A. Dans un environnement résidentiel, cet
appareil peut provoquer des brouillages radioélectriques. Dans ces cas, il peut
être demandé à l’utilisateur de prendre les mesures appropriées.
Dieses ist ein Gerät der Funkstörgrenzwertklasse A. In Wohnbereichen können
bei Betrieb dieses Gerätes Rundfunkströrungen auftreten, in welchen Fällen der
Benutzer für entsprechende Gegenmaßnahmen verantwortlich ist.
Declaration of Conformity
Manufacturer's Name: RAD Data Communications Ltd.
Manufacturer's Address: 24 Raoul Wallenberg St.
Tel Aviv 69719
Israel
declares that the product:
Product Name: FOM-E1/T1
conforms to the following standard(s) or other normative document(s):
EMC: EN 55022 (1994) Limits and methods of measurement of radio disturbance
characteristics of information technology equipment.
EN 50082-1 (1992) Electromagnetic compatibility – Generic immunity standards
for residential, commercial and light industry.
Safety: EN 60950 (1992/93) Safety of information technology equipment, including
electrical business equipment.
Supplementary Information:
The product herewith complies with the requirements of the EMC Directive 89/336/EEC and the Low
Voltage Directive 73/23/EEC. The product was tested in a typical configuration.
Tel Aviv, October 3rd, 1996
Haim Karshen
VP Quality
European Contact: RAD Data Communications GmbH, Otto-Hahn-Str. 28-30,
85521 Ottobrunn-Riemerling, Germany
Quick Start Guide
Installation of FOM-E1/T1 should be carried out only by an experienced
technician. If you are familiar with FOM-E1/T1, use this quick start guide to set it
up for operation.
This guide describes the standalone version of the modem.
Perform the installation procedures for both the local and the remote units.
1. Installing FOM-E1/T1
Configuring FOM-E1/T1
1. Open the modem’s case.
2. Select the E1/T1 electrical interface (JP2, JP4, JP5, JP6, JP7 and JP8).
3. If using E1 unbalanced interface, connect the BNC shield to the chassis ground.
If you are using balanced E1/T1, leave the shield floating (SW1 and SW2).
4. Close the modem’s case.
Table below provides details on the functions of the internal jumpers and switches,
and their default settings.
Jumper/Switch Function Possible Settings Factory
Setting
SW3, AIS When a major alarm is
detected, AIS is transmitted
to either the electrical or
optical interface.
SW2, INPUT Ground
SW1, OUTPUT Ground
JP2, JP4, JP5, JP6, JP7, JP8,
INTERFACE
Controls connection of the
BNC shield to the chassis
ground
Selects the E1/T1 electrical
interface
ON – Transmit AIS
OFF – Do not transmit AIS
CONNECTED – BNC shield is connected
to the chassis ground
(for E1 unbalanced)
FLOATING – BNC shield is disconnected
from the chassis ground
(for E1/T1 balanced)
100 ohm BAL T1 – T1 100Ω balanced
(DB-15 connector)
120 ohm BAL CEPT – E1 120Ω balanced
(DB-15 connector)
75 ohm UNBAL CEPT – E1 75Ω
unbalanced
(BNC
connectors)
ON
FLOATING
120 ohm
BAL CEPT
For
Note:
Installing FOM-E1/T1 1
FOM-E1/T1
units with 115 VAC, factory setting is 100Ω BAL T1.
Quick Start Guide FOM-E1/T1 Installation and Operation Manual
Connecting the Cables
To connect cables:
1. Connect the E1/T1 electrical interface.
2. Connect the fiber optic interface.
3. Connect the power cable (first to the modem, then to the mains).
Operation starts when the power is applied to the rear panel power
connector.
2. Operating FOM-E1/T1
1. Check that the TEST switch is set to the NORM position.
2. Verify LED status. All the LED indicators should be OFF, except for the PWR
indicator.
3. If there is an indication of a malfunction or fault, run a diagnostic test.
2 Operating FOM-E1/T1
Contents
Chapter 1. Introduction
1.1 Overview..................................................................................................................... 1-1
Versions................................................................................................................................ 1-1
Application ........................................................................................................................... 1-2
Features................................................................................................................................ 1-2
1.2 Physical Description..................................................................................................... 1-3
1.3 Functional Description................................................................................................. 1-3
Signal Conversion ................................................................................................................. 1-4
Data/Clock Recovery ............................................................................................................1-4
Data Transfer........................................................................................................................ 1-4
1.4 Technical Specifications............................................................................................... 1-5
Chapter 2. Installation and Setup
2.1 Site Requirements and Prerequisites ............................................................................ 2-1
2.2 Package Contents ........................................................................................................2-1
2.3 Installation and Setup .................................................................................................. 2-2
Configuring FOM-E1/T1........................................................................................................2-2
Connecting the Interfaces .....................................................................................................2-4
Connecting the Power ..........................................................................................................2-5
Chapter 3. Operations
3.1 Front Panel Controls and Indicators ............................................................................. 3-1
3.2 Operating Instructions ................................................................................................. 3-2
Turning On........................................................................................................................... 3-2
Normal Operating Instructions .............................................................................................. 3-2
Turning Off........................................................................................................................... 3-2
Chapter 4. Testing and Diagnostics
4.1 Status Indicators and Alarm Relay ................................................................................ 4-1
Front Panel LEDs ..................................................................................................................4-1
Alarm Relay ..........................................................................................................................4-1
4.2 Diagnostic Tests ........................................................................................................... 4-2
Local Analog Loopback (LLB) ................................................................................................ 4-2
Remote Digital Loopback (RLB).............................................................................................4-2
4.3 Troubleshooting Instructions ........................................................................................ 4-3
4.4 Frequently Asked Questions ........................................................................................ 4-4
Chapter 5. FOM-E1/T1/R Card Version
5.1 ASM-MN-214 Card Cage............................................................................................. 5-1
5.2 Power Supply .............................................................................................................. 5-2
AC Supply ............................................................................................................................5-2
DC Supply............................................................................................................................5-3
Power Supply Redundancy ................................................................................................... 5-3
5.3 FOM-E1/T1/R Front Panel............................................................................................ 5-4
FOM-E1/T1 Installation and Operation Manual i
Table of Contents
5.4 Installing the FOM-E1/T1/R Card ................................................................................. 5-5
Setting Internal Jumpers and Switches ................................................................................... 5-5
Installing FOM-E1/T1/R into the ASM-MN-214 Card Cage.....................................................5-6
Connecting the Interfaces .....................................................................................................5-6
Appendix A. Interface Connector Specifications
List of Figures
1-1 FOM-E1/T1 Application.......................................................................................................... 1-2
1-2 FOM-E1/T1 3D View.............................................................................................................. 1-3
1-3 FOM-E1/T1 Block Diagram .................................................................................................... 1-3
2-1 FOM-E1/T1 PCB Layout ......................................................................................................... 2-3
2-2 FOM-E1/T1 Rear Panel, AC-Powered Unit ............................................................................. 2-4
3-1. FOM-E1/T1 Front Panel......................................................................................................... 3-1
4-1. Local Analog Loopback ......................................................................................................... 4-2
4-2. Remote Digital Loopback ...................................................................................................... 4-2
5-1 ASM-MN-214 Rear Panel ....................................................................................................... 5-2
5-2 ASM-MN-214 Front Panel ...................................................................................................... 5-3
5-3 FOM-E1/T1/R Front Panel ...................................................................................................... 5-4
5-4 FOM-E1/T1/R PCB Layout ...................................................................................................... 5-5
List of Tables
1-1. Fiber Optic Interface Types ................................................................................................... 1-2
2-1 FOM-E1/T1 Internal Jumpers and Switches............................................................................. 2-4
3-1. FOM-E1/T1 Front Panel Controls and Indicators .................................................................... 3-1
4-1. DB-15 Connector, Alarm Relay Pins ...................................................................................... 4-1
4-2. Troubleshooting Chart ........................................................................................................... 4-3
5-1. FOM-E1/T1/R Internal Jumpers and Switches......................................................................... 5-6
ii FOM-E1/T1 Installation and Operation Manual
Chapter 1
Introduction
1.1 Overview
This manual provides information on the technical characteristics, installation and
operation of the FOM-E1/T1 fiber optic modem as a standalone unit, and as
FOM-E1/T1/R rack-mount card for the ASM-MN-214 modem rack.
FOM-E1/T1 is a fiber optic modem for transmission of E1 (2.048 Mbps) or T1
(1.544 Mbps) over multimode or single-mode fiber optic media. The
communication equipment is connected to FOM-E1/T1 according to the ITU
G.703 standard. The modem is designed to operate with several types of fiber
optic cables and connectors. The electrical signals are connected through BNC
connectors or a DB-15 connector. LED indicators show the operational status of
the modem on the front panel. Alarms indicating faults in modem operation are
provided to a supervisory port. Local and remote loopback tests are available for
diagnostics.
Versions
The following versions of the FOM-E1/T1 modem are available:
• FOM-E1/T1 – standalone unit
• FOM-E1/T1/R – a plug-in card for installation in the ASM-MN-214, 19-inch
modem rack, holding up to 14 cards (see Chapter 5 for the FOM-E1/T1/R
description).
Power Supply Options
The following power supply options are available:
• AC source: 115 VAC or 230 VAC
• DC source: 24 VDC or -48 VDC.
Overview 1-1
Chapter 1 Introduction FOM-E1/T1 Installation and Operation Manual
Application
In the application illustrated, each FOM-E1/T1 receives E1 or T1 signals that are
equalized to overcome electrical link distortion. FOM-E1/T1 then converts the E1
or T1 signals into an optical signal.
E1/T1 E1/T1 E1/T1
PBX
Coax
FOM-E1/T1 FOM-E1/T1
Fiber Optic
Figure 1-1 FOM-E1/T1 Application
Coax
DACS
Features
Fiber Optic Interface
Table 1-1 details fiber optic interface types supported by FOM-E1/T1.
Table 1-1. Fiber Optic Interface Types
Wavelength
[nm]
850 62.5/125
1310 9/125 single
1310 9/125 single
1550 9/125 single
E1/T1 Interface
• The electrical interface meets requirements of ITU G.703, G.824, G.921 and
G.935 standards for E1 and T1.
Fiber Type
[µm]
multimode
mode
mode
mode
Transmitter
Type
VCSEL -18 -38 5/3
LED -18 -40 38/24
Laser -12 -40 50/31
Laser -12 -40 100/62
Power
[dBm]
Receiver
Sensitivity
[dBm]
Typical Max.
Range
[km/miles]
1-2 Overview
• FOM-E1/T1 supports both balanced and unbalanced interfaces.
• FOM-E1/T1 conforms to all relevant ITU standards.
When FOM-E1/T1 detects electrical interface levels below G.703 electrical levels,
the modem transmits an “All 1 signal” (AIS) to the optical interface.
Test and Diagnostics Capabilities
• FOM-E1/T1’s built-in diagnostics comply with the V.54 standard.
• FOM-E1/T1 features a dry contact alarm port for attaching an external alert
device.
• When an AIS is detected at the optical or electrical interface, the modem
transparently converts the signal and alerts the user via front panel LEDs.
FOM-E1/T1 Installation and Operation Manual Chapter 1 Introduction
1.2 Physical Description
FOM-E1/T1 is a compact unit, intended for installation on desktops or shelves. An
optional rack-mount adapter kit enables FOM-E1/T1 installation into a 19-inch
rack. Figure 1-2 shows a 3D view of FOM-E1/T1.
Figure 1-2 FOM-E1/T1 3D View
The front panel indicates modem status. The front panel indicators and controls
are described in Chapter 3.
The rear panel connectors and internal jumpers are described in Chapter 2.
1.3 Functional Description
This section describes the functional circuitry of the FOM-E1/T1 fiber optic
modem. FOM-E1/T1 is used for transmission of E1 (2.048 Mbps) and T1
(1.544 Mbps) over multimode or single-mode fiber optic media. The unit is
transparent to framing and can transmit data using any framing pattern with HDB3
or B8ZS coded signals.
Figure 1-3 illustrates the FOM-E1/T1 block diagram.
TD
RD
TC & RC
EXT CLK
DTE
Interface
External Clock
CDP
Encoder/
Decoder
Receive Clock
PLL
Figure 1-3 FOM-E1/T1 Block Diagram
CDP to F/O
AGC, Equalizer
Clock Recovery
Trans mit Clock
LED
LED
F/O to CDP
FOM-E1/T1 comprises the following signal processing stages:
• Signal conversion
• Data/clock recovery
• Data transfer.
Functional Description 1-3
Chapter 1 Introduction FOM-E1/T1 Installation and Operation Manual
Signal Conversion
Conversion of the electrical signal into an optical signal takes place by using an
infrared light-emitting diode or laser transmitter. At the opposite end of the fiber,
the optical signal is converted back into an electrical signal and amplified to the
required level.
Data/Clock Recovery
To recover data and clock from the signal, a Phase Locked Loop (PLL) circuit is
utilized. FOM-E1/T1 provides internal selection for the E1/T1 electrical interfaces.
Data Transfer
The optical signal is linked to the fiber-optic media and transmitted via the optical
link to the remote unit. A high sensitivity pre-amplifier and an AGC (Automatic
Gain Control) circuit enable the remote unit to receive the optical signal. The
output of the receiver is applied to the clock recovery circuit and the data
regeneration circuit, which in turn apply it to the electrical interface driving circuit.
1-4 Functional Description
FOM-E1/T1 Installation and Operation Manual Chapter 1 Introduction
1.4 Technical Specifications
E1/T1
Interface
Optical
Interface
Transmission Rates
Interface
Zero Suppression
Connectors
Operating
Wavelength
Receiver Sensitivity
Connectors
E1: 2.048 Mbps
T1: 1.544 Mbps
User-selectable:
• E1: 120Ω balanced or 75Ω unbalanced
• T1: 100Ω balanced
E1: HDB3
T1: B8ZS
Balanced: 15-pin D-type, female
Unbalanced: two BNC
See Table 1-1
-9
For BER 10
• -38 dBm at 850 nm
• -40 dBm at 1310 nm or 1550 nm
ST, SC or FC
:
Alarm
Indicators
Dynamic Range
Budget (Max)
Operation
Connector
POWER
TEST LOC
TEST REM
ELECTRICAL LOW
ELECTRICAL AIS
OPTICAL ERR
OPTICAL AIS
28 dB for all types of optical interfaces
20 dB for 850 nm over 62.5/125
22 dB for 1310 nm over 9/125
28 dB for 1310 nm or 1550 nm laser over 9/125
Normally Open and Normally Closed, using different pins
15-pin, D-type, female
ON – The unit is powered
ON – The unit is in local loopback mode
ON – The unit is in remote loopback mode
ON – The electrical interface input is below G.703
electrical levels
ON – An “All 1s” string is received at the electrical
interface
ON – Bit error rate of the received signal from the optical
interface is 10
ON – An “All 1s” string is received at the optical interface
-6
or worse
Technical Specifications 1-5
Chapter 1 Introduction FOM-E1/T1 Installation and Operation Manual
Physical
Power
Environment
Height
Width
Depth
Weight
AC Voltage
DC Voltage
Fuses
Temperature
Humidity
44 mm / 1.7 in (1U)
179 mm / 7.0 in
203 mm / 8.0 in
1.1 kg / 3.0 lb
115 or 230 VAC (±10%), 50 or 60 Hz, 6W
24 VDC (18 to 36 VDC) or
-48 VDC (-36 to -72 VDC)
FOM-E1/T1:
• 115 VAC supply: 0.2A T 250V
• 230 VAC supply: 0.1A T 250V
FOM-E1/T1/R:
• 1A 250V and 50 mA 250V
0°–50°C / 32°–122°F
Up to 90%, non–condensing
1-6 Technical Specifications
Warning
Chapter 2
Installation and Setup
This chapter describes installation and setup procedures for the standalone
FOM-E1/T1 modem.
FOM-E1/T1 is delivered completely assembled. It is designed for tabletop or
19-inch rack installation. For instructions on installation of a single unit or two units
in a 19-inch rack, refer to the rack mounting kit for 19-inch racks guide that comes
with the RM kit.
After installing the unit, refer to Chapter 3 to assure normal operation.
In case a problem is encountered, refer to Chapter 4 for test instructions.
Internal settings, adjustment, maintenance, and repairs may be performed
only by a skilled technician who is aware of the hazards involved.
Always observe standard safety precautions during installation, operation, and
maintenance of this product.
2.1 Site Requirements and Prerequisites
An AC-powered FOM-E1/T1 should be installed within 1.5m (5 ft) of an easily
accessible grounded AC outlet. The outlet should furnish 115 VAC or 230 VAC
(depending on rated voltage of unit).
A DC-powered FOM-E1/T1 unit requires -48 VDC or 24 VDC power source,
which must be adequately isolated from the mains supply. In order to prevent a
fire hazard, a suitable fuse should be installed in the DC line.
Allow at least 90 cm (36 in) of frontal clearance for operating and maintenance
accessibility. Allow at least 10 cm (4 in) clearance at the rear of the unit for signal
lines and interface cables.
The ambient operating temperature of FOM-E1/T1 is 0° to 50°C (32° to 122°F) at
relative humidity of 90%, non-condensing.
2.2 Package Contents
The package of the standalone FOM-E1/T1 modem includes:
• One FOM-E1/T1 unit or FOM-E1/T1/R card
• Last Mile Access and Intelligent Modems CD
• AC power cord or DC power supply connector kit
• CBL-FOME1T1/RJ-45 cable for the balanced E1/T1 and alarm relay connection
(if ordered).
• RM-9 rack installation kit (if ordered).
Package Contents 2-1
Chapter 2 Installation and Setup FOM-E1/T1 Installation and Operation Manual
2.3 Installation and Setup
FOM-E1/T1 is a standalone device intended for tabletop or bench installation. It is
delivered completely assembled. No provision is made for bolting the unit on the
tabletop.
To install FOM-E1/T1:
1. Determine the required configuration of FOM-E1/T1 and set the internal
jumpers accordingly (see Configuring FOM-E1/T1 below).
2. Connect the line (see Connecting the Fiber Optic Interface below).
3. Connect the DTE (see Connecting the E1/T1 Interface below).
4. Connect power to the unit (see Connecting the Power below).
Access to the inside of the equipment is permitted only to authorized and
qualified service personnel.
To avoid accidental electric shock, always disconnect the interface cables and
the power cord before removing the unit from its casing.
Warning
Line voltages are present inside FOM-E1/T1 when it is connected to power
and/or to the lines. Moreover, under external fault conditions dangerous
voltages may appear on the lines connected to the unit.
Any adjustment, maintenance, and repair of the opened instrument under
voltage should be avoided as much as possible and, when inevitable, should
be carried out only by a skilled technician who is aware of the hazard involved.
Capacitors inside the instrument may remain charged even after the
instrument has been connected from its power supply source.
Caution
FOM-E1/T1 contains components sensitive to electrostatic discharge (ESD). To
prevent ESD damage, avoid touching the internal components. Before moving
jumpers, touch the FOM-E1/T1 frame.
Configuring FOM-E1/T1
This section describes how to configure FOM-E1/T1 for a typical application.
Figure 2-1 illustrates the layout of the FOM-E1/T1 printed-circuit board. Table 2-1
provides details on the functions of the internal jumpers and switches, and their
default settings.
To configure FOM-E1/T1:
1. Disconnect all the cables connected to FOM-E1/T1.
2. Release the two rear panel screws and use them as levers to slide out the PCB
interior of the unit.
3. Select the E1/T1 electrical interface: E1 balanced, E1 unbalanced or T1 balanced by
setting the JP2, JP4, JP5, JP6, JP7 and JP8 jumpers to appropriate position.
4. If using E1 unbalanced interface, connect the BNC shield to the chassis ground by
setting the SW1 and SW2 switches to the CONNECTED position.
If you are using balanced E1/T1 connection, set the SW1 and SW2 switches to the
FLOATING position.
2-2 Installation and Setup
FOM-E1/T1 Installation and Operation Manual Chapter 2 Installation and Setup
Note
Setting the SW1 and SW2 switches to CONNECTED is valid for coaxial cables only.
When using 4-wire connection, set these switches to FLOATING.
5. Slide the PCB interior back into the case.
6. Screw in the two rear panel screws to secure the PCB in the case.
Now you can proceed with the line, DTE and power connections as
described below.
INPUT OUTPUT
GROUNDED GROUNDED
FLOATING FLOATING
SW2 SW1
JP2
JP4
JP5
JP6
JP7
JP8
100 ohm
BAL
T1
120 ohm
BAL
CEPT
INTERFACE
75 ohm
UNBAL
Fiber Optic
Interface Board
AIS
ON
OFF
SW3
Figure 2-1 FOM-E1/T1 PCB Layout
Installation and Setup 2-3
Chapter 2 Installation and Setup FOM-E1/T1 Installation and Operation Manual
Table 2-1 FOM-E1/T1 Internal Jumpers and Switches
Jumper/Switch Function Possible Settings Factory
Setting
SW3, AIS When a major alarm is
detected, AIS is
transmitted to either the
electrical or optical
interface.
SW2, INPUT Ground
SW1, OUTPUT Ground
Controls connection of
the BNC shield to the
chassis ground
JP2, JP4, JP5, JP6, JP7, JP8,
INTERFACE
Selects the E1/T1
electrical interface
ON – Transmit AIS
OFF – Do not transmit AIS
CONNECTED – BNC shield is
connected to the
chassis ground
(for E1 unbalanced)
FLOATING – BNC shield is
disconnected from the
chassis ground
(for E1/T1 balanced)
100 ohm BAL T1 – T1 100Ω balanced
(DB-15 connector)
120 ohm BAL CEPT – E1 120Ω
balanced
(DB-15
connector)
75 ohm UNBAL CEPT – E1 75Ω
unbalanced
(BNC
connectors)
ON
FLOATING
120 ohm
BAL CEPT
Note:
For
FOM-E1/T1
units with 115 VAC, factory setting is 100Ω BAL T1.
Connecting the Interfaces
Figure 2-2 illustrates the AC-powered FOM-E1/T1 unit rear panel.
Figure 2-2 FOM-E1/T1 Rear Panel, AC-Powered Unit
Connecting the Fiber Optic Interface
Two fiber optic ST, SC or FC connectors are located on the rear panel and marked
TX and RX.
To connect the fiber optic cables
1. Remove the protective caps from the connectors and store them in a safe
place for later use.
TX
RX
OUT
IN
2-4 Installation and Setup
FOM-E1/T1 Installation and Operation Manual Chapter 2 Installation and Setup
2. Connect the transmit fiber to the connector marked TX and the receive fiber to
the connector marked RX.
3. At the remote unit connect the transmit fiber to RX and the receive fiber to TX.
Connecting the E1/T1 Interface
The rear-panel E1/T1 connector provides interface for data input/output, clock
reference and control signal exchange between FOM-E1/T1 and E1/T1 equipment.
Balanced E1/T1 interface terminates in DB-15 female connector, which also serves
as an alarm relay (see Appendix A for the connector pinout).
Unbalanced E1 interface terminates in two coaxial BNC connectors, designated as
IN and OUT. IN refers to the FOM-E1/T1 input signal. OUT refers to a signal
transmitted from FOM-E1/T1 to the attached equipment.
Note
RAD offers an optional splitter cable for connecting the DB-15 port to the balanced
E1/T1 equipment and alarm device (refer to Appendix A for further details).
The E1 and T1 ports should be connected to SELV (Safety Extra Low Voltage)
links only.
Warning
Connecting the Power
To connect the power to FOM-E1/T1, refer to the appropriate section below,
depending on your version of the unit (AC or DC).
Before switching on this unit and connecting or disconnecting any other cable,
the protective earth terminals of this unit must be connected to the protective
ground conductor of the mains power cord. If you are using an extension cord
Warning
(power cable) make sure it is grounded as well.
Any interruption of the protective (grounding) conductor (inside or outside the
instrument) or disconnecting of the protective earth terminal can make this
unit dangerous. Intentional interruption is prohibited.
The line fuse is located in an integral-type fuse holder located on the rear
panel. Make sure that only fuses of the required rating, as marked on the rear
panel, are used for replacement. Do not use repaired fuses or short-circuit the
fuse holder. Always disconnect the mains cable before removing or replacing
the fuse. Whenever it is likely that the fuse protection has been damaged,
make the unit inoperative and secure it against unintended operation.
Installation and Setup 2-5
Chapter 2 Installation and Setup FOM-E1/T1 Installation and Operation Manual
Connecting AC Power
AC power should be supplied to FOM-E1/T1 through the 1.5m (5 ft) standard
power cable terminated by a standard 3-prong plug. The cable is provided with
the unit.
To connect AC power:
1. Connect the power cable to the power connector on the FOM-E1/T1 rear
panel.
2. Connect the power cable to the mains outlet.
The unit will be turned on automatically upon connection to the mains.
Connecting DC Power
To connect DC power:
• Refer to DC power supply connection supplement.
2-6 Installation and Setup
Chapter 3
Operations
This chapter provides the following information for the FOM-E1/T1 standalone
modem:
• FOM-E1/T1 front-panel indicators and controls
• Operating procedures (turn-on, front-panel indications, performance
monitoring and turn-off).
• Installation procedures given in Chapter 2 must be completed and checked
before attempting to operate FOM-E1/T1.
3.1 Front Panel Controls and Indicators
Figure 3-1 shows the FOM-E1/T1 front panel. Table 3-1 lists the FOM-E1/T1
controls and indicators.
TEST ELECTRICAL OPTICAL
TEST ELECTRICAL OPTICAL
NORM
PWR
PWR
LOC REM
LOC REM
NORM
LOW ERRAIS AIS
LOW ERRAIS AIS
Figure 3-1. FOM-E1/T1 Front Panel
Table 3-1. FOM-E1/T1 Front Panel Controls and Indicators
Name Type Function
PWR Green LED ON – FOM-E1/T1 is powered up
LOC Yellow LED ON – A local loopback is active
REM Yellow LED ON – A remote loopback is active
TEST Slide switch LOC – Activates local analog loopback
REM – Activates remote digital loopback
NORM – Normal operation (no loopbacks are active)
ELECTRICAL LOW Red LED ON – E1/T1 electrical input is below G.703 level
ELECTRICAL AIS Yellow LED ON – E1/T1 electrical interface received "All 1s" string
OPTICAL ERR Red LED ON – Bit error rate of the signal received from at the optical
-6
interface is 10
or worse
OPTICAL AIS Yellow LED ON – Fiber optic interface received "All 1s" string
Front Panel Controls and Indicators 3-1
Chapter 3 Operations FOM-E1/T1 Installation and Operation Manual
3.2 Operating Instructions
Turning On
FOM-E1/T1 starts operating as soon as it is connected to the power source. The
PWR LED turns ON and remains lit as long as the units are connected to the
mains.
Normal Operating Instructions
During normal operation all indicators should be OFF, except for the PWR
indicator.
Note
Turning Off
Some of LEDs may turn on upon the FOM-E1/T1 power-up, indicating that other
communication equipment is not functioning properly.
Turn FOM-E1/T1 off by disconnecting the power cord from the mains.
3-2 Operating Instructions
Chapter 4
Testing and Diagnostics
This chapter describes the FOM-E1/T1 diagnostics functions, which include:
• Front panel LED indicators
• Alarm relay
• Diagnostic loopbacks.
In addition, this chapter provides some tips on troubleshooting and frequently
asked questions.
4.1 Status Indicators and Alarm Relay
Front Panel LEDs
The status of FOM-E1/T1 is indicated by the front panel LED indicators. For
description of LED indicators and their functions, refer to Chapter 3.
Alarm Relay
FOM-E1/T1 supports dry contact alarm relay via reserved pins of the DB-15 female
connector. The following fault conditions trigger relay of the major and minor
alarms:
• Major alarms are initiated when E1/T1 electrical input becomes lower than
G.703 electrical levels, or bit error rate at the fiber optic interface is 10
worse.
• Minor alarms occur when an Alarm Indication Signal is received at the E1/T1
electrical or fiber optic interfaces.
Table 4-1 lists the DB-15 connector pins used for the alarm relay.
Table 4-1. DB-15 Connector, Alarm Relay Pins
Pin Contact Alarm Type
7, 8 Normally Closed
Minor
15, 8 Normally Open
5, 6 Normally Closed
Major
13, 6 Normally Open
-6
or
Status Indicators and Alarm Relay 4-1
Chapter 4 Testing and Diagnostics FOM-E1/T1 Installation and Operation Manual
4.2 Diagnostic Tests
Local Analog Loopback (LLB)
FOM-E1/T1 supports activation of a local loopback, which tests the performance of
the E1/T1 electrical interface of the local unit and equipment attached to it.
The data received at the E1/T1 electrical interface is looped back to the equipment
attached to it (see Figure 4-1).
LOC
Position
Coax
E1 or T1 BERT
Figure 4-1. Local Analog Loopback
To activate local loopback:
• Slide the front panel TEST switch to the LOC position.
The TEST LOC indicator lights up and remains lit as long as the local
loopback is active.
Remote Digital Loopback (RLB)
FOM-E1/T1 supports activation of a remote loopback, which tests the performance
of the local unit's E1/T1 electrical and optical interfaces and the remote unit's
optical interface.
The data received at the optical interface of the remote unit is transmitted to the
remote electrical interface and at the same time is looped back to the local unit
(see Figure 4-2).
Coax Fiber Optic
FOM-E1/T1
REM
Position
To activate remote loopback:
• Slide the front panel TEST switch to the REM position.
4-2 Diagnostic Tests
E1 or T1 BERT
Local
FOM-E1/T1
Remote
FOM-E1/T1
Figure 4-2. Remote Digital Loopback
The TEST REM indicator lights up and remains lit as long as the remote
loopback is active.
FOM-E1/T1 Installation and Operation Manual Chapter 4 Testing and Diagnostics
4.3 Troubleshooting Instructions
Table 4-2 provides troubleshooting details. Perform the actions listed under
Corrective Measures in the order given in the table, until the problem is corrected.
Table 4-2. Troubleshooting Chart
Symptom Probable Cause(s) Corrective Measures
PWR LED is
OFF
ELECTRICAL
LOW LED is
ON
ELECTRICAL
AIS LED is ON
OPTICAL ERR
LED is ON
No AC power
Blown fuse Replace with fuse of proper rating.
One of the four wires is
disconnected from the DB-15
connector of FOM-E1/T1
One of coaxial cables is
disconnected or defective
The attached equipment
outputs are not according to
G.703 electrical levels
The SW1, SW2 switches are
set incorrectly
The attached equipment is
transmitting “All 1s" string
No optical connection. Ensure that both transmit and receive fiber connections on
Optical budget is too low Measure the optical loss over the fiber link and verify that it
Verify that the power outlet is providing the required power.
Ensure that both ends of the AC power cord are connected
properly.
Ensure all the wires are connected properly to the DB-15
connector.
Ensure that both ends of the coaxial cables are connected
properly and that the cables operate properly.
Check that the output levels of equipment attached to
FOM-E1/T1 comply with G.703 electrical levels.
Verify that the SW1, SW2 switch positions correspond to the
E1/T1 interface type
Ensure that the equipment attached to the FOM-E1/T1
transmits real data (not “all 1s").
the local and remote units are connected properly.
meets the product specifications.
.
OPTICAL AIS
LED is ON
Troubleshooting Instructions 4-3
The equipment attached to
the remote unit is transmitting
“All 1s" string
The remote unit detected
Electrical Low alert
Check the remote attached equipment transmission.
Check the remote unit and the remote attached equipment
for possible fault.
Chapter 4 Testing and Diagnostics FOM-E1/T1 Installation and Operation Manual
4.4 Frequently Asked Questions
Q: Does FOM-E1/T1 operate opposite FOM-40?
A: No. The fiber optic interfaces of these modems are not compatible.
Q: Can I connect FOM-E1/T1 with a balanced interface to FOM-E1/T1 with an
unbalanced interface?
A: Yes
Q: What is the maximal distance between FOM-E1/T1 and end equipment (E1
link)?
A: The FOM-E1/T1 output conforms to the G.703 standard: the coding is bipolar
±3V (CDP) with the maximum attenuation of 6 dB. This gives us a range of
approximately 300 meters for a balanced 24 AWG (0.5 mm) line. The range for
a coax cable is about 150 meters.
4-4 Frequently Asked Questions
Chapter 5
FOM-E1/T1/R Card Version
This chapter describes the card cage version of FOM-E1/T1. It discusses the
following topics:
• ASM-MN-214 card cage
• FOM-E1/T1/R plug-in card for the ASM-MN-214 cage
• Cage and card power supply
• Installation of cage and card.
5.1 ASM-MN-214 Card Cage
The ASM-MN-214 card cage contains one or two power supplies and up to
14 plug-in cards. The card types can be FOM-E1/T1/R or other RAD rack version
modems/converters – any combination of up to 14 plug-in cards.
For each of the 14 cards, the rear panel (see Figure 5-1) contains a male connector
for the terminal block and a DB-25 connector. A protection cover protects the
terminal block connectors.
The terminal block contains screws for connecting the transmit and receive pairs
and ground, for the balanced E1/T1 interface. The transmit pair is connected to
the terminals marked XMT, the receive pair – to the terminals marked RCV, while
the fifth screw is a terminal for optional ground connection. When operating
FOM-E1/T1/R with unbalanced E1 interface, use a CIA/TB-BNC/214 adapter,
which converts the terminal block connector into two coaxial BNC connectors.
The 25-pin D-type female connector serves as an alarm relay port (see Appendix A
for the connector pinout).
ASM-MN-214 Card Cage 5-1
Chapter 5 FOM-E1/T1/R Card Version FOM-E1/T1 Installation and Operation Manual
Terminal
Block
AC Supply
Terminal
Block
CIA/TB-BNC/214
Figure 5-1 ASM-MN-214 Rear Panel
5.2 Power Supply
The FOM-E1/T1/R card is powered from the ASM-MN-214 power supply via its
chassis. Each FOM-E1/T1/R card has two fuses that protect the entire system
against power failure due to a short circuit in one card (see Figure 5-4). The ratings
of the fuses are 1A, 250V and 50 mA 250V.
The ASM-MN-214 card cage can accept both AC and DC power supplies. LED
indicators located on the ASM-MN-214 front panel (see Figure 5-2) show activity
when the power supply is connected to the mains plug. The power supply
supports the full card cage with any combination of cards.
The AC power supply of the ASM-MN-214 is 100, 115, or 230 VAC, ±10%,
47 to 63 Hz.
5-2 Power Supply
FOM-E1/T1 Installation and Operation Manual Chapter 5 FOM-E1/T1/R Card Version
DC Supply
The DC power supply is -48 VDC (-36 to -72 VDC) or 24 VDC (18 to 32 VDC). It
uses a DC/DC converter module to provide the power required for the cards.
Power Supply Redundancy
This special ordering option is equipped with two separate power supplies,
operating together and sharing the load of the whole card cage. If either of the
power supplies fails, the other one will continue to supply power to the full card
cage.
Two LED indicators show activity of each power supply. They should both light
when mains power is provided.
Note
It is possible to combine AC and DC power supplies in the same cage.
Figure 5-2 ASM-MN-214 Front Panel
Power Supply 5-3
Chapter 5 FOM-E1/T1/R Card Version FOM-E1/T1 Installation and Operation Manual
5.3 FOM-E1/T1/R Front Panel
Figure 5-3 shows the FOM-E1/T1/R card front panel. The front panel of
FOM-E1/T1/R includes fiber optic connectors, loopback initiation switch and LED
indicators. The front panel LEDs of the card version are identical in their
functionality to those of the standalone device. For this information, refer to the
Front Panel Controls and Indicators section in Chapter 3.
PWR
ERR
ELECTRICAL
LOW
TEST
OPTICAL
AIS
AIS
TEST
LOC
NOR
REM
TX
5-4 FOM-E1/T1/R Front Panel
RX
FOM-E1/T1
Figure 5-3 FOM-E1/T1/R Front Panel
FOM-E1/T1 Installation and Operation Manual Chapter 5 FOM-E1/T1/R Card Version
5.4 Installing the FOM-E1/T1/R Card
Setting Internal Jumpers and Switches
The FOM-E1/T1/R internal jumpers and switches are similar in their functionality
to those of the standalone unit, as detailed Table 5-1.
Figure 5-4 illustrates the FOM-E1/T1/R PCB layout.
INPUT OUTPUT
GROUNDED GROUNDED
FLOATING FLOATING
SW1 SW3
V
E
0
S
U
5
F
2
1A
100 ohm
BAL
T1
120 ohm
BAL
CEPT
JP6
JP5
JP4
JP3
JP2
JP1
75 ohm
UNBAL
AIS
SW4
ON
OFF
V
E
0
S
U
5
F
2
5
A
0
m
Figure 5-4 FOM-E1/T1/R PCB Layout
Installing the FOM-E1/T1/R Card 5-5
Chapter 5 FOM-E1/T1/R Card Version FOM-E1/T1 Installation and Operation Manual
Table 5-1. FOM-E1/T1/R Internal Jumpers and Switches
Jumper/Switch Function Possible Settings Factory
Setting
SW4, AIS When a major alarm
is detected, AIS is
transmitted to either
the electrical or
optical interface.
SW1, INPUT Ground
SW3, OUTPUT Ground
JP1, JP2, JP3, JP4, JP5, JP6 Selects the E1/T1
Controls connection
of the BNC shield to
the chassis ground
electrical interface
ON – Transmit AIS
OFF – Do not transmit AIS
CONNECTED – BNC shield is connected to
the chassis ground
(for E1 unbalanced)
FLOATING – BNC shield is disconnected from
the chassis ground
(for E1/T1 balanced)
100 ohm BAL T1 – T1 100Ω balanced
120 ohm BAL CEPT – E1 120Ω balanced
75 ohm UNBAL CEPT – E1 75Ω unbalanced
ON
FLOATING
120 ohm
BAL CEPT
Installing FOM-E1/T1/R into the ASM-MN-214 Card Cage
To install FOM-E1/T1/R into ASM-MN-214:
1. Install the ASM-MN-214 card cage in the 19-inch rack.
2. Insert the FOM-E1/T1/R card into one of the ASM-MN-214 slots.
3. Push the card into the cage until it is fully inserted into the edge connector
inside the rack.
4. Tighten the screws on the front panel of the card.
Connecting the Interfaces
FOM-E1/T1/R uses the ASM-MN-214 rear panel terminal block ports for the E1/T1
connections. The 25-pin D-type female connector serves as an alarm relay port.
Balanced E1/T1
The two TX screws of the terminal block serve as the E1/T1 electrical signal outputs
of the modem. The RX screws serve of the terminal block as the electrical signal
inputs to the modem.
Unbalanced E1
When operating FOM-E1/T1/R with unbalanced E1 interface, use
CIA/TB-BNC/214 adapter, which converts the terminal block connector into two
coaxial BNC connectors.
Fiber Optic
The ST, SC or FC fiber optic connectors are located on the front panel of the
modem card.
Alarm Relay
The ASM-MN-214 DB-25 connector serves as an alarm relay port (see Appendix A
for the connector pinout).
5-6 Installing the FOM-E1/T1/R Card
Appendix A
Interface Connector
Specifications
A.1 Standalone FOM-E1/T1
DB-15 Connector
Balanced E1/T1 interface terminates in DB-15 female connector, which also serves
as an alarm relay. Table A-1 describes the DB-15 pins that serve for the E1/T1
connection. Table A-2 describes the DB-15 pins that serve for the alarm relay.
Table A-1. DB-15 Pin Assignment, E1/T1 Pins
Pin Designation Function
3 Send Data (TTIP) Transmit Data, A-wire
(FOM-E1/T1 output)
11 Send Data (TRING) Transmit Data, B-wire
(FOM-E1/T1 output)
1 Receive Path (RTIP) Receive Data, A-wire
(FOM-E1/T1 input)
9 Receive Path (RRING) Receive Data, B-wire
(FOM-E1/T1 input)
Table A-2. DB-15 Pin Assignment, Alarm Relay Pins
Pin Contact Alarm Type
7, 8 Normally Closed
15, 8 Normally Open
5, 6 Normally Closed
13, 6 Normally Open
Minor
Major
Standalone FOM-E1/T1 A-1
Appendix A Interface Connector Specifications FOM-E1/T1 Installation and Operation Manual
CBL-E1T1/RJ45 Cable
RAD offers an optional splitter cable, CBL-E1T1/RJ45, which connects the DB-15
female connector of the standalone unit to the balanced E1/T1 device and alarm
equipment.
The CBL-E1T1/RJ45 cable includes two DB-15 connectors (male and female) and
one RJ-45 connector. Figure A-1 illustrates the cable schematics.
RCV (RTIP)
1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 10
11 11
12 12
13 13
14 14
15 15
Male DB-15 Connector
(FOM-E1/T1 Side)
TRM (TTIP)
RCV (RRING)
TRM (TRING)
1
Female DB-15 Connector
(Alarm Equipment Side)
Twisted
Twisted
RCV (RTIP)
RCV (RRING)
TRM (TTIP)
TRM (TRING)
(E1/T1 Balanced Equipment Side)
1
2
3
4
5
6
7
8
RJ-45 Connector
Figure A-1. CBL-FOME1T1/RJ45 Scheme
A.2 FOM-E1/T1/R Modem Card
The 25-pin D-type female connector located on the rear panel of the
ASM-MN-214 modem rack serves as an alarm relay port. Table A-3 lists the
functions of the DB-25 pins.
Table A-3 ASM-MN-214, DB-25 Pin Assignment
Pin Contact Alarm Type
10, 22 Normally Closed
10, 21 Normally Open
Minor
13, 25 Normally Closed
Major
13, 24 Normally Open
A-2 FOM-E1/T1/R Modem Card
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