Axell Wireless Optical Master Unit Mark II User manual

AXELL OPTICAL MASTER UNIT MARK II
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd Doc PN 00018UM Rev. 1.9 I
Optical Master Unit Mark II
Product Description and User’s Manual
Doc PN 00018UM Rev. 1.9
THIS DOCUMENT IS VALID FOR ALL OMU MARK II MODELS

AXELL OPTICAL MASTER UNIT MARK II
PRODUCT DESCRIPTION AND USER’S MANUAL
II Doc PN 00018UM Rev. 1.9 © Axell Wireless Ltd
Copyright © 2013 Axell Wireless Ltd
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 Ltd.
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 Axell Wireless sales representative.
Contact Information
Headquarters
Axell Wireless
Aerial House
Asheridge Road
Chesham
Buckinghamshire HP5 2QD
United Kingdom
Tel: [phone]
Fax: [phone]
Commercial inquiries
[e-mail]
Web site
www.axellwireless.com
Support issues
[e-mail]
Technical Support Line, English speaking
[phone]
Contact information for Axell Wireless offices in other countries can be found on our web site,
www.axellwireless.com

AXELL OPTICAL MASTER UNIT MARK II
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd Doc PN 00018UM Rev. 1.9 III
About This Manual
This Product Manual provides the following information:
•Description of the OMU 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 Axell Wireless Remotes are familiar with the basic
functionality of Remotes.
Notice
Confidential - Authorized Customer Use
This document may be used in its complete form only and is solely for the use of Axell Wireless
employees and authorized Axell Wireless channels or customers. The material herein is proprietary to
Axell 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.
Disclaimer of Liability
Contents herein are current as of the date of publication. Axell Wireless reserves the right to change
the contents without prior notice. The information furnished by Axell Wireless in this document is
believed to be accurate and reliable. However, Axell Wireless assumes no responsibility for its use.
In no event shall Axell Wireless be liable for any damage resulting from loss of data, loss of use, or
loss of profits and Axell 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.
Exclusive Remedies
The remedies provided herein are the Buyer’s sole and exclusive remedies. Axell Wireless shall not
be viable for any direct, incidental, or consequential damages, whether based on contract, tort, or any
legal theory.

AXELL OPTICAL MASTER UNIT MARK II
PRODUCT DESCRIPTION AND USER’S MANUAL
IV Doc PN 00018UM Rev. 1.9 © Axell Wireless Ltd
References
References to standards apply as relevant to the remote type being connected to the OMU II. Please
see respective remote manual for details.
Guarantees
All antennas must be installed with lightning protection. Damage to power modules, as a result of
lightning are not covered by the warranty.
General Safety Warnings Concerning Use of This System
Always observe standard safety precautions during installation, operation and maintenance of this
product.
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: RF Exposure
RF radiation, (especially at UHF frequencies) arising from transmitter
outputs connected to AWL’s equipment, must be considered a safety
hazard.
This condition might only occur in the event of cable disconnection, or
because a ‘spare’ output has been left un-
terminated. Either of these
conditions would impair the system’s efficiency. No investigation
should be carried out until all RF power sources have been removed.
This would always be a wise precaution, despite the severe mismatch
between the impedance of an N type connector at 50
Ω, and that of free
space at 377Ω, which would severely compromise the efficient
radiation of RF power. Radio frequency burns could also be a hazard, if
any RF power carrying components were to be carelessly touched!
Antenna positions should be chosen to comply with requirements (both
local & statutory) regarding exposure of personnel to RF radiation.
When connected to an antenna, the unit is capable of producing RF
field strengths, which may exceed guideline safe values especially if
used with antennas having appreciable gain. In this regard the use of
directional antennas with backscreens and a strict site rule that
personnel must remain behind the screen while the RF power is on, is
strongly recommended.
Where the equipment is used near power lines or in association with
temporary masts not having lightning protection, the use of a safety
earth connected to the case-earthing bolt is strongly advised.

AXELL OPTICAL MASTER UNIT MARK II
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd Doc PN 00018UM Rev. 1.9 V
Caution: Safety to
personnel.
•Before installing or replacing any of the equipment, the entire
manual should be read and understood.
•The user needs to supply the appropriate AC or DC power to the
equipment. Incorrect power settings can cause damage to the
equipment and cause injury to the user.
•Please 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
•All servicing must be carried out by certified servicing engineers.
Caution: Safety to
equipment
•When 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.
•Axell 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 remote.
•All servicing must be carried out by certified servicing engineers.
Attention: Electrostatic
Sensitivity
Observe electrostatic precautionary procedures.
ESD = Electrostatic Discharge Sensitive Device.
Semiconductor transmitters and receivers provide highly reliable
performance when operated in conformity with their intended design.
However, a semiconductor may be damaged by an electrostatic
discharge inadvertently imposed by careless handling.
Static 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 remote, follow ESD
precautionary procedures including use of grounded wrist straps,
grounded workbench surfaces, and grounded floor mats.
Caution: Class 1 Laser
Equipment described in this manual are equipped with class 1 lasers, as
per definition in EN 60825-1
Caution - Un-terminated optical receptacles may emit laser radiation.
Exercise caution as follows:
•Do not stare into beam or view with optical instruments. Optical
transmitters in the fibre optic converter can send out high energy
invisible laser radiation. There is a risk for permanent damage to
the eye.
•Always use protective cover on all cables and connectors which are
not connected.
•Never look directly into a fibre cable or a connector.
•Consider that a fibre can carry transmission in both directions.
•During handling of laser cables or connections, ensure that the
source is switched off.
•Regard 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.

AXELL OPTICAL MASTER UNIT MARK II
PRODUCT DESCRIPTION AND USER’S MANUAL
VI Doc PN 00018UM Rev. 1.9 © Axell Wireless Ltd
Table of Contents
1Introduction.................................................................................................................1
1.1 Features ................................................................................................................................2
1.2 Architecture ..........................................................................................................................3
1.3 OMU II Models and Ordering Information..........................................................................4
1.4 Point-of-Interface (POI)........................................................................................................5
1.5 Supported Combinations of High-powered and Low-powered Units.............................5
1.5.1 OMU II Topology with 24 MBF-20 Remotes .............................................................6
1.5.2 OMU II Topology with Eight High-Power Remotes ...................................................6
1.6 OMU II Front Panel Modules ...............................................................................................7
1.6.1 WDM Fibre Optic Converter......................................................................................7
1.6.2 Optic Splitter..............................................................................................................8
1.6.3 RF Splitter and RF Combiner Modules .....................................................................8
1.6.4 Control Module ..........................................................................................................9
1.6.5 External Alarm and Battery Module...........................................................................9
1.6.6 Modem Unit ...............................................................................................................9
1.6.7 Modem Antenna......................................................................................................10
1.6.8 Rack Communication Board....................................................................................10
1.7 OMU Rear Panel Power and RF Interfaces ......................................................................11
1.7.1 Rear Panel for One or Two Service Connections ...................................................11
2Installation.................................................................................................................12
2.1 Installation Overview .........................................................................................................12
2.2 Unpacking...........................................................................................................................12
2.3 Mounting in Rack ...............................................................................................................12
2.4 Grounding – GND LUG ......................................................................................................13
2.5 RF Connections – Single Sector.......................................................................................14
2.6 Fibre Optic Connections ...................................................................................................14
2.7 External Alarm and Relay Connections...........................................................................16
2.8 Modem Connections..........................................................................................................16
2.8.1 GPRS Modem SIM Card Installation.......................................................................17
2.8.2 Wireless Modem Antenna Connections..................................................................17
2.8.3 PSTN Modem..........................................................................................................17
2.9 Power Connections............................................................................................................18
2.9.1 Power Cable Connections for Single/Dual Sector Rear Panel ...............................18
2.9.2 Power Up.................................................................................................................19
2.10RF Splitter/Combiner Installation .....................................................................................19
3OMU Commissioning Procedure .............................................................................20
3.1 Initiate Local Web Session................................................................................................20
3.1.1 Supported Browsers................................................................................................20
3.1.2 Opening a Local Web Session to the OMU II .........................................................20
3.1.3 Opening a Local USB Session to the OMU II .........................................................23
3.1.4 Login to the OMU II .................................................................................................24
3.2 Navigating the Web Interface............................................................................................25
3.2.1 Management Options Buttons.................................................................................25
3.2.2 Home Pane View.....................................................................................................26
3.2.3 Configuration Options..............................................................................................27
3.3 Commissioning Steps Overview ......................................................................................28
3.4 Configuring General Parameters......................................................................................29
3.4.1 Site Information - OMU II Identification ...................................................................29

AXELL OPTICAL MASTER UNIT MARK II
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd Doc PN 00018UM Rev. 1.9 VII
3.4.2 Date & Time.............................................................................................................30
3.4.3 Configure External Alarms ......................................................................................30
3.4.4 IP Address...............................................................................................................31
3.5 Remote Communication Setup.........................................................................................32
3.5.1 TCP/IP and Ethernet ...............................................................................................32
3.5.2 Modem Setup..........................................................................................................33
3.6 For Installations WITHOUT POI – RF Signal Level Limitation.......................................35
3.6.1 Calculating the Downlink Path Attenuation .............................................................35
3.6.2Setting the Attenuation............................................................................................36
3.6.3 Noise Considerations ..............................................................................................37
3.7 Optical Loss Adjustment (OLA) Per Link ........................................................................37
3.8 RF Balancing ......................................................................................................................39
3.8.1 Manual RF Balancing..............................................................................................39
3.8.2 Automatic Remote RF Balancing............................................................................42
4Setup and Commissioning of Remote Fibre-Fed Units ..........................................43
4.1 Overview .............................................................................................................................43
4.2 Connect to Remote ............................................................................................................43
5Administration...........................................................................................................45
5.1 User Accounts....................................................................................................................45
5.1.1 Default User Accounts.............................................................................................45
5.1.2 User Access Levels.................................................................................................45
5.1.3 Change Password...................................................................................................46
5.2 Reboot.................................................................................................................................46
5.3 Axell Shell (Command Line Interface) .............................................................................47
5.4 Attribute Reference............................................................................................................48
5.5 System Monitoring.............................................................................................................49
5.5.1 Module Status Monitoring........................................................................................49
5.5.2 Logs.........................................................................................................................51
5.5.3 SNMP Support.........................................................................................................52
6Troubleshooting........................................................................................................54
6.1 Troubleshooting Remote Communication ......................................................................54
6.2 Module LEDs.......................................................................................................................60
6.2.1 WDM Module LEDs.................................................................................................60
6.2.2 Control Module LEDs ..............................................................................................61
6.2.3 GSM Modem Behaviour..........................................................................................62
7OMU II Configurations...............................................................................................63
7.1 OMU II and MBF-20 Remotes ............................................................................................64
7.1.1 Single Sector 24 MBF-20 Remotes with POI..........................................................64
7.1.2 Single Sector 24 MBF-20 Remotes with Internal Splitter / Combiner.....................66
7.1.3 Dual Sector 24 MBF-20 Remotes with Internal Splitter / Combiners......................68
7.2 OMU I Replacement ...........................................................................................................70
7.2.1 OMU I Replacement – Single Sector, Six High Power Remotes............................70
7.2.2 OMU II – schematic for OMU I replacement to support 1 Sector x 6 FO................71
7.3 Single Sector – Eight High Power Remotes....................................................................72
7.3.1 Physical Configuration.............................................................................................72
7.3.2 Schematic................................................................................................................73
7.4 Two-Sectors – Eight High Power Remotes Split Evenly per Sector.............................74
7.4.1 Physical Configuration.............................................................................................74
7.4.2 Schematic................................................................................................................75
7.5 Two-Sectors – Eight High Power Remotes Split Unevenly Between Sectors .............76

AXELL OPTICAL MASTER UNIT MARK II
PRODUCT DESCRIPTION AND USER’S MANUAL
VIII Doc PN 00018UM Rev. 1.9 © Axell Wireless Ltd
7.5.1 Physical Configuration.............................................................................................76
7.5.2 Schematic................................................................................................................77
7.6 OMU II USA Solutions – with External POI......................................................................78
7.6.1 POI Single Sector –8 MBF-40 Remotes..................................................................78
7.6.2 OMU II USA POI Solutions......................................................................................80
7.6.3 External POI for OMU II with 8 MBF-40 Remotes in a single sector ......................81
8Maintenance..............................................................................................................82
8.1 General................................................................................................................................82
8.2 Preventive Maintenance ....................................................................................................82
8.3 Product Disposal................................................................................................................82
Appendix A - Specifications............................................................................................83
Appendix B – Connections with Duplex Filter...............................................................84
Appendix C - F/O Cleaning Procedure ...........................................................................85
Cleaning Procedure.........................................................................................................86
Dry Cleaning...............................................................................................................................86
Wet Cleaning ..............................................................................................................................88

AXELL OPTICAL MASTER UNIT MARK II
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd Doc PN 00018UM Rev. 1.9 1
1 Introduction
Axell OMU II is a scalable, flexible and remotely manageable fibre-to-optic conversion system
designed to provide media conversion and single source management capabilities for Axell high-
power and low-power fibre-fed Remote units. OMU II is a head-end system that acquires the RF
signal(s) from an external source, such as base station(s) or an off-air device, and converts the RF
signal into light signals for routing via optical fibres to remote Axell devices.
Depending on the model and the physical configuration, OMU II can support up to eight sectors
(where support for more than two sectors requires the use of Axell’s Point Of Interface (POI) unit in
conjunction with the OMU II).
OMU II can provide single source remote Web access commissioning and monitoring via a range of
remote modems or an Ethernet connection, where the hosted remote units are be monitored and
managed via an OMU II session.

AXELL OPTICAL MASTER UNIT MARK II
PRODUCT DESCRIPTION AND USER’S MANUAL
2 Doc PN 00018UM Rev. 1.9 © Axell Wireless Ltd
1.1 Features
•Wideband frequency range support - supports Cellular 2G, 3G, 4G services up to 2700MHz and
public safety services FM/VHF/UHF/LMR in one enclosure
•Supported Remote units – MBF-20 (low power), MBF-40 and BSF-3604 (high power)
•Modular, scalable, highly customizable system
•Flexible configuration to support up to 8 sectors via single chassis as well as MIMO and SISO
installations
•Single enclosure to support high power (MBF-40/BSF-3604) and low power (MBF-20) remote
units:
oUp to 24 MBF-20 remote units connected to a single OMU II unit
oUp to 8 high-power remote units (MBF-40 or BSF) connected to a single OMU II
unit
oVarious combinations of both high-power and low-power remote units as detailed in
section 1.5
•WDM technology (Wavelength Division Multiplexing) – single fibre connection to each Remote
unit
•Automatic Optical Loss Adjustment – system initiated pilot tones sent between the OMU II and
each of its remote units are used to automatically determine the fibre loss and perform the
necessary adjustment for each link
•One or two (for redundancy) power-supplies (115-240V AC operation or DC 48V)
•Management and control options:
oHosted fibre-optic remote units are managed and controlled via the OMU II (through
fibre communication)
oAuto detect of connected Remote units
oLocal setup via Ethernet (or via USB port)
oEthernet or wireless modem connection (optional) for remote management
oA range of supported modems including: GSM, WCDMA, CDMA 1x, PSTN
oSNMP v1/v2c support

AXELL OPTICAL MASTER UNIT MARK II
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd Doc PN 00018UM Rev. 1.9 3
1.2 Architecture
OMU II comprises of a chassis in which various modules are installed and whose rear panel varies
(model dependent) to support one RF sector, two RF sectors or up to eight RF sectors (the latter
requires the use of a POI unit).
OMU II main function is to perform the RF to optic conversion from the RF source and route the
optic signal over the optical fibres towards fibre-fed Axell remotes. Two main types of remotes are
supported: high-power and low-power. Each optic conversion module provides power to a single
high-power remote, where up to 8 optic conversion modules are supported.
To support low-powered fibre-fed remotes, an optic splitter module is used to split the optical signal
from one converter into four, feeding four low-powered fibre-fed remote units. Thus, various
combinations of supported remote units can be achieved, within the given limitations. The valid
combination of both high-power and low-power remotes per OMU II is detailed in section 1.5.
Below is a general example of an OMU II configuration fed by a single sector (BTS) and a
combination of high power (e.g. MBF-40, BSF-3604) and low power (MBF-20) remote fibre-fed
units.
Figure 1-1. Overview of OMU II Architecture

AXELL OPTICAL MASTER UNIT MARK II
PRODUCT DESCRIPTION AND USER’S MANUAL
4 Doc PN 00018UM Rev. 1.9 © Axell Wireless Ltd
The following figure illustrates one high-powered and four low-power remote connections to the
opto-board and optic splitter board.
Figure 1-2. Optic Converter Connections
1.3 OMU II Models and Ordering Information
OMU II is available in a range of models corresponding to remote products and customer needs.

AXELL OPTICAL MASTER UNIT MARK II
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd Doc PN 00018UM Rev. 1.9 5
1.4 Point-of-Interface (POI)
The POI unit is used with specific OMU II models whose rear panel is designed for interface with the
POI. This type of installation provides user customizable configurations of up to eight sectors that
can be routed to user selectable optical conversion units.
The POI front panel provides the interfaces for up to eight RF sectors, whereas the rear panel allows
the user to associate each sector to any of the OMU II optical conversion modules.
1.5 Supported Combinations of High-powered and
Low-powered Units
The following table demonstrates the available remote combination in a single OMU system. Note
that the extreme options are for only high-power remotes - up to eight are supported; only low-power
remotes - up to 24 are supported. In addition, the available combinations of both types of units.
# of MBF-40 / BSF-3604 # of MBF-20
8 0
7 4
6 8
5 12
4 16
3 16
2 20
1 20
0 24
Figure 1-3. Remote Combination Table

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PRODUCT DESCRIPTION AND USER’S MANUAL
6 Doc PN 00018UM Rev. 1.9 © Axell Wireless Ltd
1.5.1 OMU II Topology with 24 MBF-20 Remotes
Illustrated below is an example of a configuration supporting up to 24 MBF-20 units.
Figure 1-4. Example of an OMU with the maximum supported number of MBF-20 Remotes
1.5.2 OMU II Topology with Eight High-Power Remotes
The following figure illustrates an installation with several sectors (up to eight) – each with a
dedicated connection via the POI unit to the OMU II. The POI adjusts the power level of each
services to 10dBm and routes it to one or more (according to manual configuration on the unit) optic
converter units.
Figure 1-5. Example of an OMU and POI for multi-sector support

AXELL OPTICAL MASTER UNIT MARK II
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd Doc PN 00018UM Rev. 1.9 7
1.6 OMU II Front Panel Modules
OMU II chassis is designed for a 19” rack. It houses a number of different modules where the types
of modules must be inserted in specific slots. For reference, the slots in the image below are
numbered from left to right. Each of the modules is described in detail in the following sections.
The OMU II has 12 connector slots configured, where specific types of modules must be inserted in
the relevant slots.
Figure 1-6. Axell OMU Front Panel Interfaces
1.6.1 WDM Fibre Optic Converter
Caution: Class 1 Laser
Caution!!! Un-terminated optical receptacles may emit laser radiation.
Do not stare into beam or view with optical instruments.
Location: see Figure 1-6.
Provides WDM (single fibre) RF to optical signal conversion.
•Interfaces via the fibre (SC/APC port) to one of the following:
oOne high-power fibre-fed remote or
oTo an Optic Splitter module for feeding four low power
fibre-fed remotes.
•Six LED indicators: power status, error, (2) data communication
and (2) optic signals. See section 6.2.1 for more details.
ERR
PWR
UL
DATA
DL
DATA
OPTO
Rx
OPTO
Tx
SC/APC
Optic port

AXELL OPTICAL MASTER UNIT MARK II
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1.6.2 Optic Splitter
Location: see Figure 1-6.
Splits an optic signal from the connected WDM fibre-optic converter to four
F/O signals used to feed four MBF-20 units
1.6.3 RF Splitter and RF Combiner Modules
Location: see Figure 1-6.
Each pair of modules supports interface to one RF service. Depending on
whether the ports are shorted, the service(s) can be connected from the front
(or rear of the chassis).
•Combine and distribute the RF signals between the OMU’s RF port and
up to six Fibre Optic modules.
•Allows for Front Panel connection to RF source (e.g BTS).
•Contains attenuators used to set the master signal levels in the downlink
and uplink.
Note: By default, the module ports are interconnected (UL In to RF out) to
allow RF connections at the rear of the unit. However, these may be
disconnected to allow RF connections at the front of the unit for tests or
troubleshooting.
IN/OUT
RF in
DL out
RF out
UL in
To Fibre Optic
Converter port
Towards four
MBF-20 remotes

AXELL OPTICAL MASTER UNIT MARK II
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© Axell Wireless Ltd Doc PN 00018UM Rev. 1.9 9
1.6.4 Control Module
Location: see Figure 1-6.
Provides control and management connections. These include local Ethernet
(and USB) management Web management and a modem.
Manages and controls the OMU and transmits alarms to the control centre.
•Includes a Real Time Clock (RTC) with a dedicated backup battery.
•Status LEDS:
oModem Status
oModem Power
oStatus
oLogin
1.6.5 External Alarm and Battery Module
Location: see Figure 1-6.
•Supports connections for four dry-contact external alarms and an alarm
relay (output alarm).
•ON/Off switch – can switch On/Off rechargeable battery pack. When
on, allows the modem to transmit an alarm in case input power loss is
detected. Switch for ON/OFF.
•LED - Power
1.6.6 Modem Unit
Location: see Figure 1-6.
•Optional – if a modem is not available on the Control unit. For
example, PSTN modems or wireless modems with a form factor that
prevents it from being integrated with the Control Module.
•The access to a PSTN modem is via an RJ11 connector on the front of
the module.
Modem Status
Modem Power
Status
Login
.
..
..
..
..
.
..
..
..
..
LMT Port
Ethernet
PWR
Battery
PowerOn
Off
PWR

AXELL OPTICAL MASTER UNIT MARK II
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10 Doc PN 00018UM Rev. 1.9 © Axell Wireless Ltd
1.6.7 Modem Antenna
Location: see Figure 1-6.
•Always relevant if a modem (except for PSTN modem) is
installed – either as an integrated part of the Control
module or as a dedicated module.
•Provides the connection to an external (modem) antenna
1.6.8 Rack Communication Board
Location: see Figure 1-6.
•Provides two functions:
oAllows communication between the Optic Converters and
the Control Module.
•LEDs indicate communication status between Control Module and F/O
converters
Modem
ANT
To external
antenna
ERR
PWR
UL
DATA
DL
DATA
Link OK
IN OUT 1 OUT 2
ERR
PWR
UL
DATA
DL
DATA
Link OK
IN OUT 1 OUT 2

AXELL OPTICAL MASTER UNIT MARK II
PRODUCT DESCRIPTION AND USER’S MANUAL
© Axell Wireless Ltd Doc PN 00018UM Rev. 1.9 11
1.7 OMU Rear Panel Power and RF Interfaces
The OMU II rear-panel provides interface to the:
•RF source connections
•Power supply connections
Two main types of rear panels are available:
•Model supporting one or two service connections
•Model supporting up to eight service connections via POI interface
1.7.1 Rear Panel for One or Two Service Connections
The rear panel is protected by a removable plate with openings for routing the power cables and for
accessing the OMU N-type RF connections.
The rear panel may vary according to the number of supported sectors. The following figure
illustrates the rear panel supplied for a single sector with simplex RF connections.
Figure 1-7. Example of OMU II Rear Panel Interfaces – Single Sector Simplex Connections
Routed
Power Cables
RF
connections
Removable
rear panel

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PRODUCT DESCRIPTION AND USER’S MANUAL
12 Doc PN 00018UM Rev. 1.9 © Axell Wireless Ltd
2 Installation
2.1 Installation Overview
To get the system up and running, the following steps are required:
1. Unpack the equipment and verify all ordered items have been delivered and in operational
condition.
2. Mount the OMU in a 19” rack (see 2.3).
3. Ground the unit (2.4)
4. Connect rear panel RF connections in the back panel (see 2.5)
5. Connect rear panel power cables (see 2.9.1)
6. Connect all F/O connections (2.6)
7. For GPRS modem communication, insert SIM card in Control module (see 2.8.1)
8. System setup and commissioning using the Web-GUI (see Chapter 0).
2.2 Unpacking
Inspect the shipped material before unpacking the equipment, document any visual damage and
report according to routines. A delivery of an OMU from Axell Wireless contains:
•Checklist with delivered items
•OMU II Chassis with modules according to order
2.3 Mounting in Rack
The OMU is designed to be mounted in a 19” rack. Follow the standard procedure on mounting
equipment in a 19” rack.
NOTE: A fibre guide unit can be mounted above the OMU to support the fibres as they are run from
the front of the OMU to the back side of the rack..