COBHAM OMU I User manual

The most important thing we build is trust
OMU I
Optical Master Unit Mark I
User Manual – A1829300UM Rev. 3.1
THIS DOCUMENT IS VALID FOR ALL OMU MARK I MODELS

OPTICAL MASTER UNIT MARK I
PRODUCT DESCRIPTION AND USER’S MANUAL
Cobham Wireless –Coverage Date: 4-Jan-18 www.cobham.com/wireless
Document number:A1829300UM Rev. 3.1 Page | II
Copyright © 2018 Axell Wireless Limited trading as Cobham Wireless
All rights reserved.
No part of this document may be copied, distributed, transmitted, transcribed, stored in a retrieval system, or
translated into any human or computer language without the prior written permission of Axell Wireless Limited
trading as Cobham Wireless.
The manufacturer has made every effort to ensure that the instructions contained in this document are
adequate and free of errors and omissions. The manufacturer will, if necessary, explain issues which may not be
covered by this document. The manufacturer's liability for any errors in the document is limited to the correction
of errors and the aforementioned advisory services.
This document has been prepared to be used by professional and properly trained personnel, and the customer
assumes full responsibility when using them. The manufacturer welcomes customer comments as part of the
process of continual development and improvement of the documentation in the best way possible from the
user's viewpoint. Please submit your comments to the nearest Cobham Wireless sales representative.
Contact Information
Headquarters Axell Wireless trading as Cobham Wireless
Aerial House, Asheridge Road
Chesham, Buckinghamshire
HP5 2QD, United Kingdom
Tel: [phone]
Fax: [phone]
Commercial inquiries [e-mail]
Website www.cobham.com/wireless
Support issues [e-mail]
Technical Support Line, English speaking [phone]
About This Manual
This Product Manual provides the following information:
•Description of the unit
•Procedures for setup, configuration and checking the proper operation of the unit
•Maintenance and troubleshooting procedures
For whom it is intended
This Product Manual is intended for experienced technicians and engineers. It is assumed that the customers
installing, operating, and maintaining Cobham Wireless Repeaters are familiar with the basic functionality of
Repeaters.
Notice
Confidential - Authorized Customer Use
This document may be used in its complete form only and is solely for the use of Cobham Wireless employees
and authorized Cobham Wireless channels or customers. The material herein is proprietary to Cobham Wireless.
Any unauthorized reproduction, use or disclosure of any part thereof is strictly prohibited.
All trademarks and registered trademarks are the property of their respective owners.

OPTICAL MASTER UNIT MARK I
PRODUCT DESCRIPTION AND USER’S MANUAL
Cobham Wireless –Coverage Date: 4-Jan-18 www.cobham.com/wireless
Document number:A1829300UM Rev. 3.1 Page | III
Disclaimer of Liability
Contents herein are current as of the date of publication. Cobham Wireless reserves the right to change the
contents without prior notice. The information furnished by Cobham Wireless in this document is believed to be
accurate and reliable. However, Cobham Wireless assumes no responsibility for its use. In no event shall
Cobham Wireless be liable for any damage resulting from loss of data, loss of use, or loss of profits and Cobham
Wireless further disclaims any and all liability for indirect, incidental, special, consequential or other similes
damages. This disclaimer of liability applies to all products, publications and services during and after the
warranty period.
Safety Instructions and Warnings
Throughout this manual, important safety warnings and admonishments are included to warn of possible
hazards to persons or equipment. A safety warning identifies a possible hazard and then describes what may
happen if the hazard is not avoided. The safety warnings –in the form of Dangers, Warnings and Cautions must
be followed at all times. These warnings are flagged by the use of a warning icon, usually the triangular alert
icon seen below. The exclamation point within the triangular alert icon is intended to warn the operator or
service personnel of operation and maintenance from factors relating to the product and its operating
environment, which could pose a safety hazard.
General Safety Warnings Concerning Use of This System
Always observe standard safety precautions during installation, operation and maintenance of this product.
System Maintenance
•In the event of a failure Cobham Wireless’s support service should be contacted for advice on a possible
module replacement or other action to be taken.
•If a shipment of a unit back to Cobham Wireless is made within the period of guarantee the original packing
must be used.
•The system normally operates without any operator intervention or maintenance. If in the unlikely event of
any unit failure, the faulty repeater should be replaced. A failed unit can be removed and replaced with a
spare while the rest of the system (other repeaters) is still operating. However, the power supply of the
failed repeater should be isolated from the power before anything is replaced.
•Component Replacement - None of the modules in the repeater can be replaced without removing the
repeater from its mounting and opening the cover of the repeater.
Product Disposal
CAUTION!! Product Disposal - Disposal of this product must be handled according to all national
laws and regulations. For detailed information regarding materials, please refer to Cobham
Wireless.

OPTICAL MASTER UNIT MARK I
PRODUCT DESCRIPTION AND USER’S MANUAL
Cobham Wireless –Coverage Date: 4-Jan-18 www.cobham.com/wireless
Document number:A1829300UM Rev. 3.1 Page | IV
General Safety Warnings Concerning Use of System
Caution labels!
Throughout this manual, there are "Caution" warnings. "Caution" calls attention to a
procedure or practice, which, if ignored, may result in injury or damage to the system,
system component or even the user. Do not perform any procedure preceded by a
"Caution" until the described conditions are fully understood and met.
Danger:
Electrical Shock
To prevent electrical shock when installing or modifying the system power wiring,
disconnect the wiring at the power source before working with un insulated wires or
terminals.
Caution: Safety
to personnel
oBefore installing or replacing any of the equipment, the entire manual should be
read and understood.
oThe user needs to supply the appropriate AC or DC power to the repeater.
Incorrect power settings can damage the repeater and may cause injury to the
user.
oPlease be aware that the equipment may, during certain conditions become very
warm and can cause minor injuries if handled without any protection, such as
gloves.
Caution: Safety
to equipment
oWhen installing, replacing or using this product, observe all safety precautions
during handling and operation. Failure to comply with the following general safety
precautions and with specific precautions described elsewhere in this manual
violates the safety standards of the design, manufacture, and intended use of this
product.
oChanges or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
oCobham Wireless assumes no liability for the customer's failure to comply with
these precautions. This entire manual should be read and understood before
operating or maintaining the repeater.
Warning:
Restricted
Access Location
Access to the unit installation location is restricted to SERVICE PERSONNEL who have
been instructed on the restrictions and the required precautions to be taken.
Attention:
Electrostatic
Sensitivity
oObserve electrostatic precautionary procedures.
oESD = Electrostatic Discharge Sensitive Device.
oStatic electricity can be conducted to the semiconductor chip from the centre pin of
the RF input connector, and through the AC connector pins. When unpacking and
otherwise handling the repeater, follow ESD precautionary procedures including
use of grounded wrist straps, grounded workbench surfaces, and grounded floor
mats.
Caution: Class 1
Laser
The repeaters described in this manual are equipped with class 1 lasers which have
been tested to meet IEC / EN 60825-1:2014 standards.
CAUTION!- Un-terminated optical receptacles may emit laser radiation. Exercise
caution as follows:
oUse of controls or adjustments or performances of procedures other than those
specified herein may result in hazardous radiation exposure.
oDo not stare into beam or view with optical instruments. Optical transmitters in the
fiber optic converter can send out high energy invisible laser radiation. There is a
risk for permanent damage to the eye.
oAlways use protective cover on all cables and connectors which are not connected.
oNever look directly into a fiber cable or a connector.
oConsider that a fiber can carry transmission in both directions.
oDuring handling of laser cables or connections, ensure that the source is switched
off.
oRegard all open connectors with respect and direct them in a safe direction and
never towards a reflecting surface. Reflected laser radiation should be regarded as
equally hazardous as direct radiation.

OPTICAL MASTER UNIT MARK I
PRODUCT DESCRIPTION AND USER’S MANUAL
Cobham Wireless –Coverage Date: 4-Jan-18 www.cobham.com/wireless
Document number: A1829300UM Rev. 3.1 Page | V
Table of Contents
1Introduction ....................................................................................................................................1
1.1 Features..................................................................................................................................2
1.2 Models and Ordering Information............................................................................................2
1.3 OMU Installation Configurations..............................................................................................3
1.3.1 Single OMU Topology ...............................................................................................3
1.3.2 Cascading OMUs ......................................................................................................4
1.3.3 Expansion using Multi-color Laser System ...............................................................4
1.4 OMU Modules..........................................................................................................................5
1.4.1 WDM Fibre Optic Converter......................................................................................6
1.4.2 UL Combiner and DL Splitter ....................................................................................6
1.4.3 6-Way UL/DL RF Simplex Interface Cards ...............................................................7
1.4.4 Control Module..........................................................................................................7
1.4.5 External Alarm and Battery Module...........................................................................8
1.4.6 Modem Unit...............................................................................................................8
1.4.7 Modem Antenna........................................................................................................9
1.4.8 Rack Communication Board......................................................................................9
1.4.9 Power Supplies..........................................................................................................9
1.5 Rear Panel.............................................................................................................................10
2Installation....................................................................................................................................11
2.1 Unpacking.............................................................................................................................11
2.2 Mounting in Rack ..................................................................................................................11
2.3 Grounding.............................................................................................................................11
2.4 Connections..........................................................................................................................12
2.4.1 Single Sector RF Connections................................................................................12
2.4.2 Configuration at Delivery is Alternative 1. ...............................................................13
2.4.3 Fibre Optic Connections..........................................................................................13
2.4.4 Connections for Cascaded OMU Units ...................................................................14
2.4.5 External Alarm and Relay Connections ..................................................................15
2.4.6 Modem Connections ...............................................................................................16
2.5 Connecting Power and Power-up ..........................................................................................17
2.6 OMU Module Configuration Examples...................................................................................18
3Setup............................................................................................................................................20
3.1 Initiate Local Communication................................................................................................20
3.1.1 RMC Communication ..............................................................................................20
3.2 Configure the OMU................................................................................................................21
3.2.1 Set OMU Name (TAG) ............................................................................................21
3.3 Fiber Loss Compensation and Master Attenuation ................................................................21
3.4 External Alarms.....................................................................................................................22
3.5 Relay.....................................................................................................................................23
3.6 Integration into AEM..............................................................................................................23
3.7 Set Up OMU-Repeater System...............................................................................................24
3.8 Balance the System...............................................................................................................25
3.8.1 Downlink Path..........................................................................................................25
3.8.2 Fiber Loss Compensation .......................................................................................26
3.8.3 Uplink Path..............................................................................................................27
3.8.4 Noise Considerations ..............................................................................................27
3.9 Initiate Fibre Loss Compensation..........................................................................................27
3.10 Set up Remote Communication.............................................................................................30

OPTICAL MASTER UNIT MARK I
PRODUCT DESCRIPTION AND USER’S MANUAL
Cobham Wireless –Coverage Date: 4-Jan-18 www.cobham.com/wireless
Document number:A1829300UM Rev. 3.1 Page | VI
3.10.1 Communication via Modem.....................................................................................30
3.10.2 Communication via Wireless Modem......................................................................31
3.10.3 Communication via PSTN (Fixed) Modem..............................................................34
3.10.4 Communication via TCP/IP and Ethernet................................................................35
3.10.5 Troubleshooting Remote Communication...............................................................35
3.11 Integrate into the AEM...........................................................................................................41
3.12 Installation Examples ............................................................................................................41
3.12.1 OMU Signal Tapped at BTS....................................................................................41
3.12.2 OMU Signal Source provided by Repeater.............................................................42
3.12.3 Multi-Sector Configurations - Up to Six Sectors......................................................43
3.12.4 Changing UL Combiner and DL Splitter Connections.............................................44
4Troubleshooting............................................................................................................................45
4.1 Module LEDs.........................................................................................................................45
4.1.1 WDM Module LEDs.................................................................................................45
4.1.2 Control Module LEDs ..............................................................................................46
4.1.3 GSM Modem Behaviour..........................................................................................47
5Maintenance..................................................................................................................................48
5.1 General .................................................................................................................................48
5.2 Preventive Maintenance ........................................................................................................48
5.3 Product Disposal...................................................................................................................48
Appendix A: Specifications...................................................................................................................49
Appendix B: F/O Cleaning Procedure....................................................................................................50
Appendix C: EU Declaration of Conformity ...........................................................................................54

OPTICAL MASTER UNIT MARK I
PRODUCT DESCRIPTION AND USER’S MANUAL
Cobham Wireless –Coverage Date: 4-Jan-18 www.cobham.com/wireless
Document number: A1829300UM Rev. 3.1 Page | 1
1 INTRODUCTION
The Cobham Wireless OMU is a scalable, RF to optic signal conversion unit. The unit is installed near
the Base Station and is used in combination with fibre fed repeaters to provide wireless coverage for
remote sites located at a distance of up to 20 km (12.42 miles) from the Base Station.
The OMU taps the signal directly off a base station via a coupler and performs the RF to optic
conversion of the base station signal for transmission to the fibre connected repeaters. (In the
uplink, the procedure is reversed).
The OMU can either be installed at the BS or connected directly to a repeater. In that case the signal
is tapped from the repeater’s service antenna.
An OMU can be equipped to be used for frequency ranges from 88 MHz to 2170 MHz.
A single OMU unit supports up to 6 fibre optic converters, where each converter provides the signal
conversion for one Repeater. The system can be expanded to support up to 24 Repeaters.
The figure below illustrates an OMU system with six F/O converters and two power supplies.
Figure 1-1. Example of OMU System
ERR
PWR
UL
DATA
DL
DATA
IN OUT 1 OUT 2
ERR
PWR
UL
DATA
DL
DATA
IN OUT 1 OUT 2
RF in
DL out
UL in
RF out
Modem Status Modem Power
Status
Login
.
..
..
..
..
.
..
..
..
..
LMT Port
Ethernet
Modem
ANT
PWRPWR
In OK
Out OK
In OK
Out OK
ERR
PWR
UL
DATA
DL
DATA
OPTO
Rx
OPTO
Tx
SC/APC
ERR
PWR
UL
DATA
DL
DATA
OPTO
Rx
OPTO
Tx
SC/APC
ERR
PWR
UL
DATA
DL
DATA
OPTO
Rx
OPTO
Tx
SC/APC
ERR
PWR
UL
DATA
DL
DATA
OPTO
Rx
OPTO
Tx
SC/APC
ERR
PWR
UL
DATA
DL
DATA
OPTO
Rx
OPTO
Tx
SC/APC
ERR
PWR
UL
DATA
DL
DATA
OPTO
Rx
OPTO
Tx
SC/APC
ERR
PWR
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DATA
DL
DATA
OPTO
Rx
OPTO
Tx
SC/APC
ERR
PWR
UL
DATA
DL
DATA
OPTO
Rx
OPTO
Tx
SC/APC
ERR
PWR
UL
DATA
DL
DATA
OPTO
Rx
OPTO
Tx
SC/APC
ERR
PWR
UL
DATA
DL
DATA
OPTO
Rx
OPTO
Tx
SC/APC
ERR
PWR
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DL
DATA
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Rx
OPTO
Tx
SC/APC
ERR
PWR
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DATA
DL
DATA
OPTO
Rx
OPTO
Tx
SC/APC
PWR
Battery
Power
LinkOK
On
Off On Off On Off

OPTICAL MASTER UNIT MARK I
PRODUCT DESCRIPTION AND USER’S MANUAL
Cobham Wireless –Coverage Date: 4-Jan-18 www.cobham.com/wireless
Document number:A1829300UM Rev. 3.1 Page | 2
1.1 Features
•Frequency ranges from 88 MHz to 2 170 MHz.
•WDM technology (Wavelength Division Multiplexing) – single fibre connection to each Repeater
•Each OMU supports up to 6 Repeaters
•Scalability – up to four OMUs can be cascaded for support of up to 24 Repeaters
•Multi-sectors support - OMU I can support up to six sectors (model specific)
•Single-source management – cascaded OMUs can be controlled via the “Master” OMU
•Two independent power supplies (in the unit) – can be used to either:
•allow for flexibility in power supply source selection according to the type of voltage available
on site: 115 – 230 VAC 50/60 Hz and 24 – 48 VDC
•provide power supply redundancy by installing two power supplies of the same type
•Flexible RF signal source – RF signal can be acquired either from the BS or from the Repeater's
Service antenna
•Easily replaceable modules
•Simple, local setup via RS232 connection
•Remote management via Ethernet connection or via modem
•Various types of modems are supported: for example GSM, GSM-R, HSDPA/UMTS, TETRA, GPRS
and PSTN.
•Single modem (installed at the Master OMU) is required for management of cascaded OMUs
•Modem can be integrated (part of the Control module) or connected separately
1.2 Models and Ordering Information
OMU is available in a range of models corresponding to repeater products

OPTICAL MASTER UNIT MARK I
PRODUCT DESCRIPTION AND USER’S MANUAL
Cobham Wireless –Coverage Date: 4-Jan-18 www.cobham.com/wireless
Document number:A1829300UM Rev. 3.1 Page | 3
1.3 OMU Installation Configurations
The OMU can be installed in several configurations:
•Basic configuration of a single OMU installed at the BTS
•Expanding the system by either:
•Linking several OMUs (up to four)
•Using laser systems with three or four colours.
1.3.1 Single OMU Topology
The following figure illustrates the connections for a single OMU installed at the BTS. The OMU
supports up to six Repeaters, where each repeater is connected via optic fibre to an RF/Optic
converter module on the OMU. Each OMU supports up to six RF/Optic converters – for connections to
up to six Repeaters.
In the downlink the radio signal is tapped from a BTS using a coupler installed in series with the
BTS’s antenna cable. The Fibre Optic Converter in the OMU converts the RF signal to an optical signal
and sends it to the repeater over a fibre.
In the uplink the Fibre Optic Converter receives the optical RF signal from the repeater, converts it to
electrical RF signal and sends it to the BTS. The signal is transferred to the antenna cable using a
coupler.
Figure 1-2. Example of Single OMU Topology
BTS
Directional
Coupler
RF
OMU
Repeater
Opto Fiber
RF
FiberOptic
Converters
Server
Antenna
Up to Six
Repeaters

OPTICAL MASTER UNIT MARK I
PRODUCT DESCRIPTION AND USER’S MANUAL
Cobham Wireless –Coverage Date: 4-Jan-18 www.cobham.com/wireless
Document number:A1829300UM Rev. 3.1 Page | 4
1.3.2 Cascading OMUs
Up to four OMUs can be cascaded and operate up to 24 repeaters as one system: one Master OMU
and three Slave OMUs.
This type of topology requires only one Control module and one modem (at the Master OMU). All
OMUs and hosted Repeaters are managed as a single system via the Master OMU.
Figure 1-3. Four OMUs cascaded in one system
1.3.3 Expansion using Multi-color Laser System
The number of Repeaters supported by each OMU can be expanded using multi-coloured laser
systems.
A laser system with two colours can operate one repeater for each fibre optic converter in an OMU-
Repeater system – one color is used for the uplink and one for the downlink. A laser system with
three or more colours can operate two or more repeaters per fibre optic converter. One color is used
for the downlink which is the same for all repeaters, and in the uplink each repeater has its own
color.
The connection from one repeater to the next is done via so called add-drop couplers.
The difference in distance between the repeaters and the OMU can be compensated for
automatically.
Two repeaters are connected to the same converter in the OMU via the same fibre but the
wavelength for the uplink differs between the units. Slave 1: 1550 ± 3 nm, Slave 2: 1510 ± 3 nm.
The downlink signal is the same for both repeaters.
Figure 1-4. Dual-colour Fibre Connections to Two Repeaters
BTS
RepeatersOMU Units