Motorola 1999-2001
All Rights Reserved
Printed in the U.K.
31st Oct 01
Service Manual: Horizon
68P02902W06-B
CONTROLLED INTRODUCTION
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Copyrights, notices and trademarks
Copyrights
The Motorola products described in this document may include copyrighted Motorola computer
programs stored in semiconductor memories or other media. Laws in the United States and other
countries preserve for Motorola certain exclusive rights for copyright computer programs, including the
exclusive right to copy or reproduce in any form the copyright computer program. Accordingly, any
copyright Motorola computer programs contained in the Motorola products described in this document
may not be copied or reproduced in any manner without the express written permission of Motorola.
Furthermore, the purchase of Motorola products shall not be deemed to grant either directly or by
implication, estoppel or otherwise, any license under the copyrights, patents or patent applications of
Motorola, except for the rights that arise by operation of law in the sale of a product.
Restrictions
The software described in this document is the property of Motorola. It is furnished under a license
agreement and may be used and/or disclosed only in accordance with the terms of the agreement.
Software and documentation are copyright materials. Making unauthorized copies is prohibited by
law. No part of the software or documentation may be reproduced, transmitted, transcribed, stored
in a retrieval system, or translated into any language or computer language, in any form or by any
means, without prior written permission of Motorola.
GSM-205-020
Accuracy
Trademarks
While reasonable efforts have been made to assure the accuracy of this document, Motorola
assumes no liability resulting from any inaccuracies or omissions in this document, or from the use
of the information obtained herein. Motorola reserves the right to make changes to any products
described herein to improve reliability, function, or design, and reserves the right to revise this
document and to make changes from time to time in content hereof with no obligation to notify any
person of revisions or changes. Motorola does not assume any liability arising out of the application
or use of any product or circuit described herein; neither does it convey license under its patent
rights of others.
and
MOTOROLA
Aspira, Intelligence Everywhere, M-Cell and Taskfinder are trademarks of Motorola Inc.
All other brands and corporate names are trademarks of their respective owners.
The following shows the issue status of this manual since it was first released.
Version
information
The following lists the versions of this manual in order of manual issue:
Issue status of this manual
Resolution of
Service
Requests
Manual
issue
O3rd Jun 99Original issue.
A15th Oct 99Updated to include details for EGSM900.
B31st Oct 01Updated to include details for GSM850 and
The following Service Requests are now resolved in this manual:
Service
Request
N/AN/A
Date of
issue
PCS1900.
GMR
Number
Remarks
Remarks
31st Oct 01
Service Manual: Horizon
68P02902W06-B
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CONTROLLED INTRODUCTION
1
General information
General information
Important
notice
If this manual was obtained when attending a Motorola training course, it will not
be updated or amended by Motorola. It is intended for TRAINING PURPOSES
ONLY. If it was supplied under normal operational circumstances, to support a
major software release, then corrections will be supplied automatically by
Motorola in the form of General Manual Revisions (GMRs).
Purpose
Motorola cellular communications manuals are intended to instruct and assist
personnel in the operation, installation and maintenance of the Motorola cellular
infrastructure equipment and ancillary devices. It is recommended that all
personnel engaged in such activities be properly trained by Motorola.
GSM-205-020
About this
manual
WARNING
Failure to comply with Motorola’s operation, installation
and maintenance instructions may, in exceptional
circumstances, lead to serious injury or death.
These manuals are not intended to replace the system and equipment training
offered by Motorola, although they can be used to supplement and enhance the
knowledge gained through such training.
The manual contains: technical description of the hardware elements,
installation and configuration information, repair procedures and parts lists for
the Horizon
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indoor equipment in Motorola GSM850, GSM/EGSM900,
DCS1800 and PCS1900 systems.
The objectives are to help the reader:
Gain an overview of the equipment and interconnection of components.
Understand the function and operation of all components.
Recognize configurations, and equivalent module functions to M-Cell
6
(an
interchangeable previous cabinet).
Be aware of the warnings (potential for harm to people) and cautions
(potential for harm to equipment) to be observed when working on the
equipment.
Understand how to install and commission the equipment.
Understand how to inspect, maintain, and repair the equipment.
Have a clear ready reference for all dedicated information in one manual.
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CONTROLLED INTRODUCTION
GSM-205-020
Cross
references
Text
conventions
General information
Throughout this manual, cross references are made to the chapter numbers and
section names. The section name cross references are printed bold in text.
This manual is divided into uniquely identified and numbered chapters that, in
turn, are divided into sections. Sections are not numbered, but are individually
named at the top of each page, and are listed in the table of contents.
The following conventions are used in the Motorola cellular infrastructure
manuals to represent keyboard input text, screen output text and special key
sequences.
Input
Characters typed in at the keyboard are shown like
this.
Output
Messages, prompts, file listings, directories, utilities, and
environmental variables that appear on the screen are shown like
this.
Special key sequences
Special key sequences are represented as follows:
CTRL–c
ALT–fPress the Alt and f keys at the same time.
|Press the pipe symbol key.
CR or RETURNPress the Return (Enter) key. The Return key is
Press the Control and c keys at the same time.
identified with the ↵ symbol on both the PC and
the Sun keyboards. The keyboard Return key
may also be identified with the word Return.
31st Oct 01
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CONTROLLED INTRODUCTION
3
First aid in case of electric shock
First aid in case of electric shock
Warning
WARNINGDo not touch the victim with your bare hands until the
electric circuit is broken.
Switch off. If this is not possible, protect yourself with
dry insulating material and pull or push the victim clear of
the conductor.
Artificial
respiration
In the event of an electric shock it may be necessary to carry out artificial
respiration. Send for medical assistance immediately.
GSM-205-020
Burns treatment
If the patient is also suffering from burns, then, without hindrance to artificial
respiration, carry out the following:
1.Do not attempt to remove clothing adhering to the burn.
2.If help is available, or as soon as artificial respiration is no longer required,
cover the wound with a dry dressing.
3.Do not apply oil or grease in any form.
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CONTROLLED INTRODUCTION
GSM-205-020
Reporting safety issues
Introduction
Whenever a safety issue arises, carry out the following procedure in all
instances. Ensure that all site personnel are familiar with this procedure.
Procedure
Whenever a safety issue arises:
1.Make the equipment concerned safe, for example, by removing power.
2.Make no further attempt to tamper with the equipment.
3.Report the problem directly to the Customer Network Resolution Centre,
Swindon +44 (0)1793 565444 or China +86 10 68437733 (telephone) and
follow up with a written report by fax, Swindon +44 (0)1793 430987 or
China +86 10 68423633 (fax).
Reporting safety issues
4.Collect evidence from the equipment under the guidance of the Customer
Network Resolution Centre.
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CONTROLLED INTRODUCTION
5
Warnings and cautions
Warnings and cautions
Introduction
The following describes how warnings and cautions are used in this manual and
in all manuals of this Motorola manual set.
Warnings
Definition of Warning
A warning is used to alert the reader to possible hazards that could cause loss
of life, physical injury, or ill health. This includes hazards introduced during
maintenance, for example, the use of adhesives and solvents, as well as those
inherent in the equipment.
GSM-205-020
Cautions
Example and format
WARNINGDo not look directly into fibre optic cables or data in/out
connectors. Laser radiation can come from either the data
in/out connectors or unterminated fibre optic cables
connected to data in/out connectors.
Definition of Warning
A caution means that there is a possibility of damage to systems, software or
individual items of equipment within a system. However, this presents no danger
to personnel.
Example and format
CAUTIONDo not use test equipment that is beyond its calibration
due date when testing Motorola base stations.
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CONTROLLED INTRODUCTION
GSM-205-020
General warnings
Introduction
Observe the following warnings during all phases of operation, installation and
maintenance of the equipment described in the Motorola manuals. Failure to
comply with these warnings, or with specific warnings elsewhere in the Motorola
manuals, violates safety standards of design, manufacture and intended use of
the equipment. Motorola assumes no liability for the customer’s failure to comply
with these requirements.
Warning labels
Personnel working with or operating Motorola equipment must comply with any
warning labels fitted to the equipment. Warning labels must not be removed,
painted over or obscured in any way.
Specific
warnings
General warnings
High voltage
RF radiation
Warnings particularly applicable to the equipment are positioned on the
equipment and within the text of this manual. These must be observed by all
personnel at all times when working with the equipment, as must any other
warnings given in text, on the illustrations and on the equipment.
Certain Motorola equipment operates from a dangerous high voltage of 230 V
ac single phase or 415 V ac three phase supply which is potentially lethal.
Therefore, the areas where the ac supply power is present must not be
approached until the warnings and cautions in the text and on the equipment
have been complied with.
To achieve isolation of the equipment from the ac supply, the ac input isolator
must be set to off and locked.
Within the United Kingdom (UK) regard must be paid to the requirements of the
Electricity at Work Regulations 1989. There may also be specific country
legislation which need to be complied with, depending on where the equipment
is used.
High RF potentials and electromagnetic fields are present in the base station
equipment when in operation. Ensure that all transmitters are switched off when
any antenna connections have to be changed. Do not key transmitters
connected to unterminated cavities or feeders.
31st Oct 01
Refer to the following standards:
ANSI IEEE C95.1-1991,
IEEE Standard for Safety Levels with Respect to
Human Exposure to Radio Frequency Electromagnetic Fields, 3 kHz to
300 GHz
CENELEC 95 ENV 50166-2,
High Frequency (10 kHz to 300 GHz)
.
Service Manual: Horizon
68P02902W06-B
Human Exposure to Electromagnetic Fields
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CONTROLLED INTRODUCTION
7
General warnings
Laser radiation
Lifting
equipment
Do not ...
GSM-205-020
Do not look directly into fibre optic cables or optical data in/out connectors.
Laser radiation can come from either the data in/out connectors or unterminated
fibre optic cables connected to data in/out connectors.
When dismantling heavy assemblies, or removing or replacing equipment, the
competent responsible person must ensure that adequate lifting facilities are
available. Where provided, lifting frames must be used for these operations.
When equipments have to be manhandled, reference must be made to the
Manual Handling of Loads Regulations 1992 (UK) or to the relevant manual
handling of loads legislation for the country in which the equipment is used.
... substitute parts or modify equipment.
Battery supplies
Toxic material
Because of the danger of introducing additional hazards, do not install substitute
parts or perform any unauthorized modification of equipment. Contact Motorola
if in doubt to ensure that safety features are maintained.
Do not wear earth straps when working with standby battery supplies.
Certain equipment may incorporate components containing the highly toxic
material Beryllium or its oxide Beryllia or both. These materials are especially
hazardous if:
Beryllium materials are absorbed into the body tissues through the skin,
mouth, or a wound.
The dust created by breakage of Beryllia is inhaled.
Toxic fumes are inhaled from Beryllium or Beryllia involved in a fire.
Beryllium warning labels are fitted to equipment incorporating Beryllium or
Beryllium Oxide. Observe all safety instructions given on warning labels.
Beryllium Oxide is used within some components as an electrical insulator.
Captive within the component it presents no health risk whatsoever. However, if
the component should be broken open or burnt, the Beryllium Oxide, in the form
of dust or fumes, could be released, with the potential for harm.
Lithium
batteries
8
Lithium batteries, if subjected to mistreatment, may burst and ignite. Defective
lithium batteries must not be removed or replaced. Any boards containing
defective lithium batteries must be returned to Motorola for repair.
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CONTROLLED INTRODUCTION
GSM-205-020
General cautions
Introduction
Observe the following cautions during operation, installation and maintenance of
the equipment described in the Motorola manuals. Failure to comply with these
cautions or with specific cautions elsewhere in the Motorola manuals may result
in damage to the equipment. Motorola assumes no liability for the customer’s
failure to comply with these requirements.
Caution labels
Personnel working with or operating Motorola equipment must comply with any
caution labels fitted to the equipment. Caution labels must not be removed,
painted over or obscured in any way.
General cautions
Specific
cautions
Fibre optics
Static discharge
Cautions particularly applicable to the equipment are positioned within the text
of this manual. These must be observed by all personnel at all times when
working with the equipment, as must any other cautions given in text, on the
illustrations and on the equipment.
The bending radius of all fibre optic cables must not be less than 30 mm.
Motorola equipment contains CMOS devices that are vulnerable to static
discharge. Although the damage caused by static discharge may not be
immediately apparent, CMOS devices may be damaged in the long term due to
static discharge caused by mishandling. Wear an approved earth strap when
adjusting or handling digital boards.
See Devices sensitive to static for further information.
31st Oct 01
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CONTROLLED INTRODUCTION
9
Devices sensitive to static
Devices sensitive to static
Introduction
Certain metal oxide semiconductor (MOS) devices embody in their design a thin
layer of insulation that is susceptible to damage from electrostatic charge. Such
a charge applied to the leads of the device could cause irreparable damage.
These charges can be built up on nylon overalls, by friction, by pushing the
hands into high insulation packing material or by use of unearthed soldering
irons.
MOS devices are normally despatched from the manufacturers with the leads
shorted together, for example, by metal foil eyelets, wire strapping, or by
inserting the leads into conductive plastic foam. Provided the leads are shorted
it is safe to handle the device.
GSM-205-020
Special
handling
techniques
In the event of one of these devices having to be replaced, observe the
following precautions when handling the replacement:
Always wear an earth strap which must be connected to the electrostatic
point (ESP) on the equipment.
Leave the short circuit on the leads until the last moment. It may be
necessary to replace the conductive foam by a piece of wire to enable the
device to be fitted.
Do not wear outer clothing made of nylon or similar man made material. A
cotton overall is preferable.
If possible work on an earthed metal surface. Wipe insulated plastic work
surfaces with an anti-static cloth before starting the operation.
All metal tools should be used and when not in use they should be placed
on an earthed surface.
Take care when removing components connected to electrostatic sensitive
devices. These components may be providing protection to the device.
10
When mounted onto printed circuit boards (PCBs), MOS devices are normally
less susceptible to electrostatic damage. However PCBs should be handled with
care, preferably by their edges and not by their tracks and pins, they should be
transferred directly from their packing to the equipment (or the other way
around) and never left exposed on the workbench.
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CONTROLLED INTRODUCTION
GSM-205-020
Motorola GSM manual set
Introduction
The following manuals provide the information needed to operate, install and
maintain the Motorola equipment.
Generic GSM
manuals
The following are the generic manuals in the GSM manual set, these manuals
are release dependent:
The following are the Motorola Base Station service manuals, these manuals
are not release dependent. The internal organization and makeup of service
manual sets may vary, they may consist of from one to four separate manuals,
but they can all be ordered using the overall catalogue number shown below:
The following are the Motorola GPRS service manuals, these manuals include
the Packet Control Unit (PCU) service manual which becomes part of the BSS
for GPRS:
GPRS-301-020Service Manual:GPRS Support Nodes (GSN)68P02903W05. . . . .
GPRS-302-020Service Manual: Packet Control Unit (PCU)68P02903W10. . . . . . .
The classification number is used to identify the type and level of a manual. For
example, manuals with the classification number GSM-100-2xx contain
operating information.
The Motorola 68P order (catalogue) number is used to order manuals.
31st Oct 01
All orders for Motorola manuals must be placed with your Motorola Local Office
or Representative. Manuals are ordered using the order (catalogue) number.
Motorola manual sets may also be ordered on CD-ROM.
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CONTROLLED INTRODUCTION
13
GMR amendment
GMR amendment
Introduction to
GMRs
Changes to a manual that occur after the printing date are incorporated into the
manual using General Manual Revisions (GMRs). GMRs are issued to correct
Motorola manuals as and when required. A GMR has the same identity as the
target manual. Each GMR is identified by a number in a sequence that starts at
01 for each manual at each issue. GMRs are issued in the form of loose leaf
pages, with a pink instruction sheet on the front.
GMR procedure
When a GMR is received, remove and replace pages in this manual, as detailed
on the GMR pink instruction sheet.
GSM-205-020
14
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CONTROLLED INTRODUCTION
31st Oct 01
GSM-205-020
GMR amendment record
GMR
instructions
When a GMR is inserted in this manual, the amendment record below is
completed to record the GMR. Retain the pink instruction sheet that
accompanies each GMR and insert it in a suitable place in this manual for future
reference.
Amendment
record
Record the insertion of GMRs in this manual in the following table:
The Horizon
with variants that operate in the following frequency bands: GSM850, GSM/
EGSM900, DCS1800, and PCS1900.
Indoor cabinets operate from either –48/60 V dc (positive earth), +27 V dc
(negative earth), or wide input, nominal 120/240 V, ac single phase supplies.
An optional battery backup system is available for use with the –48/60 V dc
BTS, and is described in
Horizonmacro Indoor: (GSM-205-023) Order number 68P02900W59
Cooling is provided by circulation fans located in the bottom of the unit.
Figure 1-1 shows an external view of a standard cabinet with an optional hood
fitted.
macro
indoor is a six carrier base transceiver station (BTS) cabinet,
Service Manual: Battery Backup System for
.
31st Oct 01
Figure 1-1 Indoor cabinet on plinth with optional hood
Technical Description: Horizon
68P02902W07-B
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CONTROLLED INTRODUCTION
ig.225.rh
Tech. 1–1
Equipment introduction and manual definition
Names and
acronyms for
main cabinet
equipment
This section is intended to give the reader a basic understanding of how
components interconnect.
The BTS cabinet consists of the cabinet frame structure, a main cage and a top
panel, and contains the following equipment, as shown in Figure 1-2:
A digital module shelf, located in the lower right side of the cabinet. This
contains master and optional redundant digital modules:
–Fibre optic multiplexer (FMUX), 1 + 1 redundant (if required).
–Main control unit with dual FMUX (MCUF), 1 + 1 redundant (if
required).
–Network interface units (NIUs), four in total.
GSM-205-323
–An alarm board (no redundancy option).
–One or two (for redundancy) BCU power supply modules (BPSMs).
Up to three power supply modules (PSMs) and one circuit breaker module
(CBM) in the upper right portion of the cabinet. The PSMs are load
sharing, with the third PSM providing optional redundancy.
Up to six compact transceiver units (CTUs), located in the left side of the
cabinet.
Fan modules mounted in the bottom of the cabinet, two 2-fan modules
and one 4-fan module.
RF modules, mounted in the top panel, comprising transmit (Tx) blocks,
and a receive (Rx) module, the sectorized universal receiver front-end
(SURF). The various Tx blocks are listed in Specifications in this chapter.
Interface panel, mounted in the top panel, for power and customer
communications connectors.
Tech. 1–2
Technical Description: Horizon
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CONTROLLED INTRODUCTION
31st Oct 01
GSM-205-323
Cabinet inside
view
Equipment introduction and manual definition
Figure 1-2 shows the location of components and main headings for detailed
information in this technical description category of the manual.
hold-up battery module may be installed instead of a
redundant PSM.
Figure 1-2 Cabinet with components identified (door and base plinth removed)
Technical Description: Horizon
68P02902W07-B
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Tech. 1–3
CONTROLLED INTRODUCTION
Equipment introduction and manual definition
Configuration
information
GSM-205-323
Finding
information in
this manual
Configuration information can be found in
System Information: BSS Equipment
Planning: (GSM-001-103) Order number 68P02900W21.
Each category and chapter has a table of contents (TOC). Headings are
designed to convey contents accurately, to enable manual search. The index
provides an alternative method of finding subsections of information. This
chapter provides a summary of the equipment, to enable readers to understand
terminology and thus locate information via the TOCs and index.
The service manual set comprises the four categories below:
Category 323
Provides an introduction, specification, and technical description.
Category 423
Provides the information for installation and commissioning.
Category 523
Provides information on maintenance and repair, with procedures to
change Field Replaceable Units (FRUs).
Category 623
Provides list of options and spares, with diagrams to illustrate FRUs.
The category 323 technical description is divided into chapters based on
functionality as shown in Figure 1-2:
Overview and specifications
This chapter provides a summary of the equipment to enable the reader to
understand terminology, and thus locate information via the TOCs and
index.
Cabinet structure, including:
Interface panel, main cage, door and optional hood.
Temperature control system, including:
2-fan and 4-fan.
Cabinet power supply, including:
PSM, BPSM and circuit breaker module.
RF modules, including:
CTU, SURF, Tx blocks and CCB.
Digital modules, including:
Tech. 1–4
MCUF, NIU, T43/BIB connections, FMUX and alarm module.
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CONTROLLED INTRODUCTION
31st Oct 01
GSM-205-323
Stacking
capability and
cabinet view
Equipment introduction and manual definition
An optional stacking bracket enables any of the BTS variants to have a second
cabinet mounted on top of the first. The stacking bracket also enables an
optional Cavity Combining Block (CCB) to be installed in an optional stacking
bracket basket. A stacking bracket can be placed on top of the second (stacked)
cabinet, as shown in Figure 1-3.
NOTE
CCBs are not currently available for the GSM850 or
PCS1900 BTS variants.
31st Oct 01
Figure 1-3 View of two cabinets stacked in maximum assembly
Technical Description: Horizon
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CONTROLLED INTRODUCTION
Tech. 1–5
Equipment introduction and manual definition
Functional
diagram of
Horizon
macro
GSM-205-323
Figure 1-4 shows the functional modules of a Horizon
one transceiver and one Tx block has been shown.
TO SURF or
MCell6 Rx OF
EXTENSION
CABINET
EXT
SURF
0B1B1A2A2B0A
Rx0
SWITCH (CONTROLLED BY CTU)
Rx ARx B
Rx2Rx1
RF LOOPBACK
UP TO SIX TRANSCEIVERS
(CTUs)
SEPARATE OR COMBINED)
Tx
macro
. For clarity, only
ANTENNAS (Tx and Rx
Rx FILTER
Tx FILTER
UP TO THREE
Tx BLOCKS
NIU
MCUF
6
FMUX
FMUX
FMUX
NIUNIUNIU
TO NETWORK
2
2
2
TO FMUX OF
EXTENSION CABINET
TO FMUX OF
EXTENSION CABINET
TO FMUX OF
EXTENSION CABINET
Figure 1-4 Functional diagram of cabinet components
RF
MODULES
DIGITAL
MODULES
Tech. 1–6
Technical Description: Horizon
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CONTROLLED INTRODUCTION
31st Oct 01
GSM-205-323
M-Cell6 comparison with Horizon
macro
M-Cell6 comparison with Horizon
Comparison
overview
Horizon
and M-Cell
macro
6
compatibility
The Horizon
GSM/EGSM900 and DCS1800 Horizon
with M-Cell
BTSs can be combined to form a single site, with either a Horizon
M-Cell
with M-Cell
are described in this section, to assist understanding.
The Horizon
components. The plinth base fix points are the same as M-Cell
replacement may require repositioning, to allow for adequate cabinet spacing.
The Horizon
and/or to enable mounting a second Horizon
macro
6
6
being in control of the other units. Since many customers are familiar
6
macro
macro
is a replacement for M-Cell
. For example, a mixture of up to four Horizon
, and will use Horizon
is a single cabinet, using reduced size and higher reliability
can have a stacking bracket fitted to enable CCB installation,
macro
macro
macro
with M-Cell6, equivalent components
2/6
base stations, and the
variants are directly compatible
macro
macro
.
and M-Cell
macro
6
, though direct
or an
6
A 24-carrier BTS site (in an 8/8/8 configuration) can be achieved by combining
four units as shown in Figure 1-5. This is the maximum BTS size. Each unit can
be either a Horizon
can control the other three units; the MCU of M-Cell6 and the MCUF of
Horizon
An MCUF can be fitted into an M-Cell
MCU cannot be fitted into a Horizon
diagram of the digital connectons in a four cabinet BTS site.
macro
macro
being identical in control function.
or an M-Cell6. Either a Horizon
6
and will then function as an MCU. An
macro
. Figure 1-5 shows a schematic
2
2
2
macro
or an M-Cell
6
31st Oct 01
Figure 1-5 Digital connections in maximum BTS site
Technical Description: Horizon
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CONTROLLED INTRODUCTION
Tech. 1–7
M-Cell6 comparison with Horizon
Comparison of
Horizon
and M-Cell
macro
6
connections
and modules
macro
GSM-205-323
Table 1-1 compares the main components of the Horizon
6
components of M-Cell
Table 1-1 Main components of Horizon
FunctionHorizon
Input power conversion unitsPSMPSM (different)
Power to radios and BPSMBackplaneCables
TransceiverCTUTCU/TCU-B
Main processor board
(formerly GPROC, KSW and
GCLK boards in BTS4/5/6
(pre-M-Cell) equipment)
Connection radio to MCUBackplaneFOX
Connection MCU to
transceivers in another cabinet
Rx components and
distribution
Radio to Rx componentsSURF HarnessCables
(the previous generation of equipment).
macro
macro
component
MCUFMCU
MCUF internal FMUX
(two) or external
FMUX (one)
SURFDNLB & IADU
macro
and M-Cell
, with equivalent
6
M-Cell6 equivalent
FMUX
Tx componentsDCF, TDF, DDF, HCU
and CCB
Links to terrestrial networkNIUNIU
E1/T1 linksT43/BIBT43/BIB
Power for digital boardsBPSMBPSM
CBF, MPDM, HPDM
HC and CCB
Tech. 1–8
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CONTROLLED INTRODUCTION
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GSM-205-323
Specifications
Overview of
specifications
Specifications
Software
requirements
Approval and
safety
All Horizon
The GSM/EGSM900 and DCS1800 BTSs require software release GSR4 (or
later) in the network.
The GSM850 and PCS1900 BTSs require software release GSR5.1 (or later) in
the network.
Table 1-2 lists the specifications with which the Horizon
Type
approval
macro
specifications are included in this section.
macro
Table 1-2 Horizon
GSM/EGSM900 & DCS1800GSM850 & PCS1900
macro
specification compliance
ETS 301 502
CFR47 Part 22 (850 only)
CFR47 Part 24 (1900 only)
indoor complies.
CFR47 Part 2
Environmental
limits
EMCEN301 489-8
CFR 47 Part 2 and 15
CFR47 Part 22 (850 only)
CFR47 Part 24 (1900 only)
SafetyEN 60215, IEC 60215, EN 60950, IEC 950,
CSA 22.2 No. 950, UL 1950
Table 1-3 lists the operating and storage environmental limits.
Table 1-3 Environmental limits
EnvironmentTemperatureRelative Humidity
Operating–5 C to + 45 C.5% to 100% relative humidity, not to
exceed 0.029 g water / m
Storage–45 C to +70 C.8% to 100% relative humidity, not to
exceed 0.029 g water / m
NOTEThis specification is valid up to 3 km altitude,
corresponding to an atmospheric pressure range of 648 to
1048 millibars.
3
dry air.
3
dry air.
31st Oct 01
Technical Description: Horizon
68P02902W07-B
macro
indoor
CONTROLLED INTRODUCTION
Tech. 1–9
Specifications
Power
requirements
GSM-205-323
Cabinet power supply requirements
Table 1-4 lists the power supply requirements for the different power supply
options.
Table 1-4 Main indoor cabinet power supply requirements
Nominal VoltageVoltage supply
Current supply maximum
range
+27 V dc (negative earth)+20 to +30 V dc64 A (at nominal voltage)
–48 V dc (positive earth)–39 to –72 V dc36 A (at nominal voltage)
120/240 V ac (50 – 60 Hz)88 to 2647.5 A (at nominal voltage)
NOTEVoltage transients must be less than 35 V peak amplitude
(never below 0 V). Ripple and noise must be less than 200
mV p-p (30 mV rms) over 10 Hz to 14 MHz. Voltage
application stabilization must be within the specified range
in less than 1 second.
Power consumption
Table 1-5 lists typical and maximum power consumption values
Table 1-5 Power consumption of full cabinet, including digital redundancy
Typical measured consumptionMaximum power consumption
1400 watts1700 watts
Tech. 1–10
NOTEMaximum power consumption figures are theoretical
values derived under extreme conditions and are affected
by variables such as temperature, component tolerances,
transmission power and supply voltage.
Although these figures must be considered when planning
site power requirements, typical measured consumption
values will be lower.
Technical Description: Horizon
68P02902W07-B
macro
indoor
31st Oct 01
CONTROLLED INTRODUCTION
GSM-205-323
Specifications
Maximum thermal dissipation
Thermal dissipation has to remove the energy of maximum power consumption,
less RF power output of the six transceivers.
Maximum power consumption:1700 W.
Six CTUs at full power at DCF Tx blocks:
1800 MHz(6 x 16 = 96) approx. 100 W.
900 MHz(6 x 20 = 120) 120 W.
Maximum thermal dissipation 1800 MHz:1700 – 100 = 1600 W.
Maximum thermal dissipation 900 MHz:1700 – 120 = 1580 W.
RF power
output
NOTE
Thermal dissipation figures are not currently available for
when 850 MHz or 1900 MHz CTUs are used.
Table 1-6 lists the RF power output of the CTU types.
Table 1-6 CTU RF power output at Tx connector
GSM850 and EGSM900DCS1800 and PCS1900
60 W (47.8 dBm) +/– 1.0 dB50 W (47.0 dBm) +/–1.0 dB
Table 1-7 lists the expected power output from the various Tx blocks for both
types of CTU.
Table 1-7 RF power output at cabinet after Tx blocks
Tx blockGSM850EGSM900DCS1800PCS1900
TDF40 W
(46.0 dBm)
DCF20 W
(43.0 dBm)
32 W
(45.1 dBm)
16 W
(42.1 dBm)
31st Oct 01
DDF8.5 W
(39.3 dBm)
CCB*n/a20 W
(43.0 dBm)
16 W
(42.1 dBm)
7 W
(38.5 dBm)
n/a
* For a six-channel configuration with minimum cavity separation of 800 kHz.
NOTECCBs are not currently available for the GSM850 or
PCS1900 variants.
Technical Description: Horizon
68P02902W07-B
macro
indoor
Tech. 1–11
CONTROLLED INTRODUCTION
Specifications
Sensitivity
Battery backup
GSM-205-323
The receive sensitivity of the equipment is shown in Table 1-8.
* Guaranteed over all channel types, fading profiles, RF frequencies
and operating conditions.
BSC
connectivity
options
Indoor cabinet
dimensions
The Horizon
An optional hold-up battery module, (sufficient to provide ten seconds of backup
power), can be fitted in the PSM shelf, in an empty slot or in place of the
redundant PSM. The optional hold-up battery module is described in chapter 4
of this category in Hold-up battery module
Additional battery backup capacity can be provided by installation of an optional
battery back up system, described in
Horizonmacro indoor; GSM-205-023, 68P02900W59
Options exist for E1, T1 and HDSL (star and daisy chain) connection.
The dimensions of cabinets are shown in Table 1-9.
Cabinet (without hood)750 mm700 mm430 mm
macro
indoor cabinet has no internal battery backup as standard.
Service manual: Battery backup system for
.
Table 1-9 Cabinet dimensions
Cabinet typeHeightWidthDepth
Tech. 1–12
Cabinet with optional hood870 mm700 mm430 mm
Cabinet with stacking bracket (to hold CCB)1025 mm700 mm430 mm
Two cabinets, with stacking bracket
between, and optional hood on top
Two cabinets, with stacking bracket
between, and stacking bracket on top.
The optional hood allows cables to enter the cabinet from the back and above.
The stacking bracket allows a second cabinet to be stacked on top of the first
cabinet. The stacking bracket can also contain a metal basket, in which CCBs
are fitted (the only Tx unit that cannot fit in the cabinet itself).
Technical Description: Horizon
68P02902W07-B
macro
1900 mm700 mm430 mm
2050 mm700 mm430 mm
indoor
31st Oct 01
CONTROLLED INTRODUCTION
GSM-205-323
Weights
Specifications
The maximum weight of the cabinet is shown in Table 1-10.
Torque values
CAUTION
Consider future expansion. Another cabinet may be added
by stacking on top of the existing cabinet. This, if used
with stacking units on both, each with CCBs, and
associated cables, could result in a total weight of 280 kg.
Ensure floor is capable of supporting this weight.
Table 1-10 Main indoor cabinet weights (with six transceivers)
Cabinet with plinth and
optional hood
Cabinet with plinth, stacking bracket and
CCB
115 kg130 kg
Table 1-11 details torque values used during installation, maintenance and
repair procedures.
Table 1-11 Torque values for all cabinet screws/bolts and RF connectors
Size of
M4M6M8M10SMAN-type7/16
screw/bolt
Torque value2.2 Nm3.4 Nm5 Nm10 Nm1 Nm3.4 Nm25 Nm
NOTETorque values used with M12 anchor bolts will depend on
the anchor bolt manufacturer. Check manufacturer’s data
for correct values.
31st Oct 01
Technical Description: Horizon
68P02902W07-B
macro
indoor
CONTROLLED INTRODUCTION
Tech. 1–13
Specifications
Frequency
capability
GSM-205-323
Frequency hopping
The Horizon
macro
supports baseband frequency hopping (BBH) and
synthesizer frequency hopping (SFH).
NOTE
Baseband frequency hopping is not supported in the
GSM850 and PCS1900 Horizon
macro
variants.
Frequency band characteristics
BTS radio channels (RF carriers) are full duplex (transmit and receive) with the
characteristics listed in Table 1-12 for GSM/EGSM900 and DCS1800 BTSs and
in Table 1-13 for GSM850 and PCS1900 BTSs.
Table 1-12 Frequency band characteristics – GSM/EGSM900 and DCS1800
GSM900EGSMDCS1800
Transmit frequency band
(MHz)
Receive frequency band (MHz)890 to 915880 to 9151710 to 1785
Transmit/receive duplex
separation (MHz)
Channel width (kHz)200200200
Number of channels124174374
935 to 960925 to 9601805 to 1880
454595
Transmit frequency guard
bands (MHz)
Receive frequency guard
bands (MHz)
Transmit channel centre
frequency (MHz)
Receive channel centre
frequency (MHz)
935.0 to
935.1
959.9 to
960.0
890.0 to
890.1
914.9 to
915.0
Even 10ths
of a MHz
from 935.2
to 959.8
Even 10ths
of a MHz
from 890.2
to 914.8
925.0 to
925.1
959.9 to
960.0
880.0 to
880.1
914.9 to
915.0
Even 10ths
of a MHz
from 925.2
to 959.8
Even 10ths
of a MHz
from 880.2
to 914.8
1805.0 to
1805.1
1879.9 to
1880.0
1710.0 to
1710.1
1784.9 to
1785.0
Even 10ths of
a MHz from
1805.2 to
1879.8
Even 10ths of
a MHz from
1710.2 to
1784.8
Tech. 1–14
Technical Description: Horizon
68P02902W07-B
macro
indoor
CONTROLLED INTRODUCTION
31st Oct 01
GSM-205-323
Specifications
Table 1-13 Frequency band characteristics – GSM850 and PCS1900
GSM850PCS1900
Transmit frequency band (MHz)869 to 8941930 to 1990
Receive frequency band (MHz)824 to 8491850 to 1910
Transmit/receive duplex
4580
separation (MHz)
Channel width (kHz)200200
Number of channels124299
Transmit frequency guard
bands (MHz)
Receive frequency guard bands
(MHz)
Transmit channel centre
frequency (MHz)
Receive channel centre
frequency (MHz)
869.0 to 869.1
893.9 to 894.0
824.0 to 824.1
848.9 to 849.0
Even 10ths of a
MHz from
869.2 to 893.8
Even 10ths of a
MHz from
824.2 to 848.8
1930.0 to 1930.1
1989.9 to 1990.0
1850.0 to 1850.1
1909.9 to 1910.0
Even 10ths of a
MHz from
1930.2 to 1989.8
Even 10ths of a
MHz from
1850.2 to 1909.8
31st Oct 01
Technical Description: Horizon
68P02902W07-B
macro
indoor
CONTROLLED INTRODUCTION
Tech. 1–15
Specifications
Structural
considerations
GSM-205-323
Adequate clearance must be provided at the front of the equipment for
operation and maintenance purposes. There must be adequate side clearance
(50 mm) to enable the door to open beyond 90° (see Figure 1-6). The door can
also stop at 95° and 130° , but this is only to protect the door, or give optional
additional operator space.
The cabinet ventilation entry can be solely from the bottom front of the cabinet.
This allows a cabinet to be placed against a wall. However, if the unit is placed
50 mm from back or side obstructions, such as wall or other cabinets, the
ventilation will be improved, and fan noise reduced.
Up to 100 mm rear space may be required for cables if using stacking bracket.
The foundation or structure on which the BTS cabinet is mounted must be of
sufficient strength to support a maximum gross weight of 130 kg for a single
cabinet or 280 kg for two stacked cabinets.
Layout plan
NOTE
In seismically active areas, Motorola suggest using a
qualified structural engineer to assess frame mounting
requirements, such as floor construction, mounting
anchors, cell site construction and to provide a suitable
design for top frame support if a stacked configuration is
required.
Figure 1-6 shows the cabinet installation layout plan.
Figure 2-1 shows an external view of a closed cabinet with optional hood, and a
cabinet with door open and no hood.
macro
indoor
31st Oct 01
Figure 2-1 Closed cabinet and cabinet with hood removed and door open
Technical Description: Horizon
68P02902W07-B
macro
indoor
Tech. 2–1
CONTROLLED INTRODUCTION
Cabinet structure of Horizon
Overview of
structure
description
The equipped cabinet is shown in Figure 2-2. The cabinet, intended for
minimum maintenance and maximum ease of module replacement, and has
access only from the front and the top.
This chapter describes the cabinet structure and inner connections to assist
understanding of the cabinet functions. There should be no need to dismantle
the cabinet beyond Field Replaceable Unit (FRU) level.
The cabinet structure components are explained in the following sections:
Empty cabinet and SURF harness
This section describes the empty cabinet and the SURF harness connections
between the SURF and the backplane and transceivers.
macro
indoor
GSM-205-323
Space required
around cabinet
Top panel
This section describes the bare top panel with all the modules removed.
This section describes the CBIA. It also describes the backplane connections
between all modules, and the harness from the backplane to the interface top
panel connectors.
Door and hood
This section describes the structure and function of the door and optional hood.
Stacking bracket and CCB basket
This section describes the stacking bracket. It is used for mounting a second
cabinet on top of the first, and/or providing a mounting position for CCBs.
See Specifications in Chapter 1.
Tech. 2–2
Technical Description: Horizon
68P02902W07-B
macro
indoor
CONTROLLED INTRODUCTION
31st Oct 01
GSM-205-323
Filled cabinet
view
Cabinet structure of Horizon
macro
indoor
Figure 2-2 shows a cabinet with maximum number of modules installed. Further
information is detailed in the later technical description chapters.
hold-up battery module may be installed instead of a
redundant PSM.
Figure 2-2 Cabinet, without door or hood, showing main components
Technical Description: Horizon
68P02902W07-B
macro
indoor
CONTROLLED INTRODUCTION
Tech. 2–3
Empty cabinet and SURF harness
Empty cabinet and SURF harness
SURF harness
and cabinet
attachment
The SURF harness is fitted on the back wall of the cabinet, as shown in
Figure 2-3. The chassis of the SURF harness supports the SURF module.
The SURF harness provides:
Three connectors to the SURF, for RF and power.
One RF connector to each CTU, consisting of three inputs, one each for
RxA, RxB and RF loopback test, as shown in Figure 2-4. The RF
connectors are free floating to ensure fitting of CTU modules.
One connector to the backplane, for power from the PSMs.
GSM-205-323
Cabinet view
with installed
SURF harness
Figure 2-3 shows the SURF harness installed in an empty cabinet, with, for
clarity, SURF harness cables not shown.
SURF HARNESS
EARTH CABLE FOR
MAIN CAGE
Tech. 2–4
Figure 2-3 SURF harness installed in empty cabinet.
Technical Description: Horizon
68P02902W07-B
macro
indoor
CONTROLLED INTRODUCTION
ig.232.rh
31st Oct 01
GSM-205-323
SURF harness
view
Empty cabinet and SURF harness
Figure 2-4 shows the SURF harness with connectors indicated.
SLOT FOR SURF
MODULE
RxB X 6
RF LOOPBACK X 6
THREE CONNECTORS
TO SURF
POWER CONNECTOR TO
BACKPLANE
CTU 5
CONNECTOR FOR
EACH CTU
LOCATING PINS
RxA X 6
RxA
RF LOOPBACK
TEST PORT (L)
CTU 0
31st Oct 01
Figure 2-4 SURF harness with connectors indicated
Technical Description: Horizon
68P02902W07-B
macro
indoor
CONTROLLED INTRODUCTION
RxB
ig.233.rh
Tech. 2–5
Top panel
Top panel
Top panel
description
GSM-205-323
The top panel provides:
A basket to hold up to three Tx blocks. This includes three holes to
enable connection of CTU Tx cables to the underside of each Tx block.
The holes also allow cooling of the Tx blocks from underneath.
A slot for insertion of the SURF module.
A location hole for the interface panel.
An area for ventilation purposes above the PSMs.
A cable hole for fibre optic extension cables from the MCUF FMUX to an
FMUX of another cabinet.
Top panel view
Figure 2-5 shows a top panel with major features labelled.
The main cage holds modules and supports the backplane. Each compartment
has appropriate sliders for insertion of the modules. Figure 2-8 shows the
module compartments of the cage.
MAIN CAGE
TRANSCEIVERS (CTUs)
2-FAN
2-FAN
POWER SUPPLY MODULES
CIRCUIT BREAKER MODULE
FULL SIZE
DIGITAL
MODULES
(MCUFs
AND
ALARM)
(PSMs)
HALF SIZE DIGITAL
MODULES (FMUX,
NIUs AND BPSM)
HALF SIZE DIGITAL
MODULES (FMUX,
NIUs AND BPSM)
4-FAN
CBIA harness
function
31st Oct 01
HOLES IN BACK PANEL OF CAGE FOR
BACKPLANE FAN CONNECTORS
Figure 2-8 Front view of CBIA cage showing where modules fit
The harness provides cables to link connectors on the backplane with
connectors on the underside of the interface panel.
The cabinet design enables all possible RF and digital module combinations to
be served by the same backplane. The only module-to-module cabling required
are the Tx cables from the transceivers to the Tx blocks. Any external
attachments will also require separate cabling.
The backplane is a multilayered printed circuit board with attached connectors
on front and back. The backplane:
Routes power and digital signals throughout the cabinet.
Provides connectors for the harness cables linking to the interface panel.
Provides connectors for plug in modules.
Provides power to the SURF harness, when the main cage is inserted into
the cabinet.
Provides a connector for the door switch cable.
GSM-205-323
Attachment of
cage to cabinet
Provides connectors for three heat sensors in the main cage above the
CTUs.
The CBIA is fitted to the cabinet at the factory and is not intended to be
removed in the course of normal maintenance or FRU replacement procedures.
The interface panel provides all connection points to:
The required power sources.
External alarms (for example battery backup system alarms)
Connection points to all telecommunications links.
All connectors are linked to the backplane via the CBIA harness. Plastic
connector covers, supplied by Motorola, keep unused connectors protected
from damage by static or foreign matter and should be retained.
Figure 2-9 shows the locations of the interface panel connectors.
GPS
(if fitted)
T43/BIB
CCB
PIX 0
PIX 1
EXTERNAL ALARMS
DC POWER
INPUT
VENTILATION
GRID
AC POWER
SOCKET INPUT
ICS
ig.239.rh
Interface panel
pinouts
31st Oct 01
Figure 2-9 Interface panel connector locations
Interface panel pinouts are detailed in
(GSM-205-423)
Technical Description: Horizon
Interface panel cabling of this service manual.
68P02902W07-B
CONTROLLED INTRODUCTION
Installation and Configuration:
macro
indoor
Tech. 2–11
Cabinet door and optional hood
Cabinet door and optional hood
Door function
The cabinet is fitted with a door and a hood option. The optional hood cannot
be fitted in conjuction with a stacking bracket.
The door has the following functions:
Protects modules from damage.
Ensures correct air ventilation.
Provides EMC shielding.
The door has a ventilation grid with internal honeycomb grid, a vertical
aluminium air baffle, and a horizontal door stop bracket. The door stop bracket
enables the door to open to 95 or 130 degrees.
The lock is a trigger latch, opened (if unlocked) by pressing the middle button.
There is also a door alarm bracket, to touch the cabinet door switch.
GSM-205-323
Door external
and internal
view
Figure 2-10 shows both sides of the cabinet door.
DOOR ALARM
BRACKET
EXTERNAL VIEW
INTERNAL VIEW
DOOR STOP
BRACKET
Tech. 2–12
VENTILATION
GRID
Technical Description: Horizon
CONTROLLED INTRODUCTION
VERTICAL AIR
BAFFLE
TRIGGER
LATCH
HONEYCOMB
VENTILATION
Figure 2-10 External and internal view of cabinet door
macro
indoor
68P02902W07-B
ig.266.rh
31st Oct 01
GSM-205-323
Hood function
View of hood
Cabinet door and optional hood
The optional hood can be fitted to keep unsightly cables and connectors out of
view, where this is important.
Figure 2-11 shows a top view of the hood.
LIFTING EDGE
Securing pins
and hood
removal
ig.267.rh
Figure 2-11 View of hood as seen from the front of the cabinet
The hood mounts on four pins that screw into the cabinet top panel, replacing
existing screws.
The hood can be easily lifted off the cabinet by pulling on the lifting edge at the
rear, as shown in Figure 2-11.
31st Oct 01
Technical Description: Horizon
68P02902W07-B
macro
indoor
CONTROLLED INTRODUCTION
Tech. 2–13
Stacking bracket and CCB basket
Stacking bracket and CCB basket
Stacking
bracket function
The stacking bracket has two main functions:
To enable a second cabinet to be stacked on top of the first cabinet.
To house CCBs in a dedicated optional CCB basket.
The stacking bracket is fixed to the top of the cabinet by eight M8 screws. If the
stacking bracket is replacing an existing hood, then the four hood securing pins
must first be removed to accommodate four of the stacking bracket screws. A
second cabinet may be attached on top of the stacking bracket by four M10
screws.
Lower cabinet outlet and additional upper cabinet inlet ventilation is provided by
the large open sides of the stacking bracket (especially on the right side of the
cabinet).
GSM-205-323
Stacking
bracket diagram
The CCB basket is fitted only if CCBs are required. The CCB basket is
removable, to enable access for SURF module replacement.
Figure 2-12 shows a view of the stacking bracket with CCB basket installed.
M10 HOLES (4) FOR TOP CABINET
ATTACHMENT (IF REQUIRED)
REAR OF
BRACKET
Tech. 2–14
CCB BASKET
(IF REQUIRED)
DETACHABLE
CCB BASKET BAR
M8 HOLES (8) FOR
BOTTOM CABINET
Figure 2-12 View of stacking bracket with CCB basket installed.
Technical Description: Horizon
68P02902W07-B
macro
indoor
CONTROLLED INTRODUCTION
ATTACHMENT.
ig.268.rh
31st Oct 01
GSM-205-323
Stacking
bracket front
cover function
View of stacked
cabinets
Stacking bracket and CCB basket
The stacking bracket front cover clips onto the front of the stacking bracket and
provides the following functions:
Protection for CCB (if fitted).
Blanking panel to match appearance of cabinet door.
Figure 2-13 shows a view of two stacked Horizon
front covers attached to the two stacking brackets.
The Horizon
within the operational temperature range, to ensure correct operation of the
equipment and to guard against premature failure of the individual components.
The internal temperature is maintained within these limits by internal fans.
Under overheat conditions, as the temperature rises above preset levels,
temperature sensors located in various areas within the cabinet provide alarms.
A further increase in temperature causes dual sensors, set at a higher threshold
temperature to initiate PSM and cabinet shutdown. The cabinet is restarted
when the sensors are reset by a substantial fall in temperature.
The CTUs have their own shutdown responses to overheating. The CTUs
shutdown at 92 C.
850/900 MHz CTUs also have an internal 4 dB power reduction response to
overheating at 85 C. 1800/1900 MHz CTUs have a 0.6 dB cut back at 70 C, in
addition to the 4 dB power reduction at 85 C.
The CTU shutdown response to overheating provides a second level of cabinet
protection, independent of the cabinet heat sensors.
macro
indoor cabinet contains equipment that has to be maintained
Temperature
sensors
Cabinet restart
after shutdown
The three cabinet temperature sensors are located above the CTU
compartment (see Figure 2-7) and consist of the following:
One 70 C sensor provides a cabinet overtemperature alarm when the
cabinet temperature exceeds planned level. The alarm is processed by
the alarm board and MCUF, and sent on to the OMC-R via the BSC.
Two 85 C sensors shut down the PSMs to protect the cabinet equipment
from heat damage. Both sensors must detect excess temperature for the
shutdown to take place; this reduces the risk of an unnecessary shutdown.
No prior notification of shutdown is given to the OMC-R, except for the
original 70 C sensor alarm. This is because the MCUF and CTUs
immediately lose power and functionality.
The cabinet is restarted when the overtemperature condition initiating shutdown
has reset. The two 85 C temperature sensors reset at 55 C. This
re-establishes an earth point for the PSM internal detectors connected to the
cabinet heat sensors, which then reactivate the PSM outputs. The MCUF then
reboots as in a normal power up.
31st Oct 01
Technical Description: Horizon
68P02902W07-B
macro
indoor
CONTROLLED INTRODUCTION
Tech. 3–1
Fan unit description
Fan unit description
Fan unit
overview
The indoor cabinet operating temperature is maintained by three sets of fans:
One 4-fan unit (referred to as FAN0), located in front and beneath the
digital module shelf.
Two identical 2-fan units, (referred to as FAN1 and FAN2), located
beneath the CTUs.
Figure 3-1 shows the two types of fan unit:
2-FAN
UNIT
GSM-205-323
4-FAN
UNIT
Fan operation
and reset
Filter option
and effect on
fans
RESET BUTTONS
(ONE PER FAN)
SLIDE LATCH FOR
MODULE REMOVAL
Figure 3-1 View of 2-fan and 4-fan units
The fans draw in air from beneath the cabinet, and the air is expelled through
the door and top cabinet vents. The fans run continuously, and respond to
temperature changes to ensure adequate flow. The speed of each fan is
controlled by a heat sensor mounted on the fan hub.
Each fan has a reset button, for use if a fan has stopped or cannot start. Each
reset button is marked FRONT or REAR to identify the appropriate fan.
Tech. 3–2
The filter is an option and not essential in a clean environment. The single filter
is mounted under all the fan units. If clogged, fan airflow may be reduced,
straining fan motors and increasing fan noise.