Paradyne Compshere 3000 Series User manual

COMSPHERE
–48 Vdc CENTRAL OFFICE
POWER UNIT
INSTALLATION GUIDE
Document No. 3000-A2-GB41-50
October 2002

COMSPHERE –48 Vdc Central Office Power Unit
AOctober 2002 3000-A2-GB41-50
COMSPHERE
–48 Vdc Central Office Power Unit
Installation Guide
3000-A2-GB41-50
6th Edition (October 2002)
Changes and enhancements to the product and to the information herein will be documented and issued as a new release.
Warranty, Sales, and Service Information
Contact your local sales representative, service representative, or distributor directly for any help needed. For additional information
concerning warranty, sales, service, repair, installation, documentation, training, distributor locations, or Paradyne worldwide office
locations, use one of the following methods:
•Via the Internet: Visit the Paradyne World Wide Web site at http://www.paradyne.com
•Via Telephone: Call our automated call system to receive current information via fax or to speak with a company representative.
— Within the U.S.A., call 1-800-870-2221
— Outside the U.S.A., call 1-727-530-2340
Trademarks
All products and services mentioned herein are the trademarks, service marks, registered trademarks or registered service marks of their
respective owners.
COPYRIGHT E2002 Paradyne Corporation. All rights reserved.
Thispublicationisprotected by federalcopyright law.No part ofthis publicationmay be copiedor distributed,transmitted, transcribed,stored ina retrievalsystem,
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without the express written permission of Paradyne Corporation, 8545 126th Avenue North, P.O. Box 2826, Largo, Florida 33779-2826.
ParadyneCorporationmakesnorepresentationorwarrantieswithrespecttothecontentshereofandspecificallydisclaimsanyimpliedwarrantiesofmerchantability
orfitnessfor aparticular purpose.Further,Paradyne Corporationreserves therightto revisethispublication andto makechangesfrom timeto timeinthe contents
hereof without obligation of Paradyne Corporation to notify any person of such revision or changes.
Printed on recycled paper

Safety Instructions
B3000-A2-GB41-50 October 2002
!Important Safety Instructions
1. Read and follow all warning notices and instructions marked on the product or
included in the manual.
2. Slots and openings in the cabinet are provided for ventilation. To ensure reliable
operation of the product and to protect it from overheating, these slots and openings
must not be blocked or covered.
3. Do not attempt to service this product yourself, as opening or removing covers may
expose you to dangerous high voltage points or other risks. Refer all servicing to
qualified service personnel.
4. General purpose cables are provided with this product. Special cables, which may be
required by the regulatory inspection authority for the installation site, are the
responsibility of the customer. To reduce the risk of fire, use a UL Listed or CSA
Certified, minimum No. 26 AWG telecommunication cable.
5. When installed in the final configuration, the product must comply with the applicable
Safety Standards and regulatory requirements of the country in which it is installed. If
necessary, consult with the appropriate regulatory agencies and inspection
authorities to ensure compliance.
6. This product is to be conneted to a 48 VDC SELV supply source that is electrically
isolated from the AC source. The positive terminal of the 48 VDC source is to be
reliably connected to earth. Connect a green/yellow earthing (grounding) wire to the
protective earthing (grounding) lug connector, identified by the protective earth
symbol on the chassis.
7. In addition, if the equipment is to be used with telecommunications circuits, take the
following precautions:
—Never install telephone wiring during a lightning storm.
—Never install telephone jacks in wet locations unless the jack is specifically
designed for wet locations.
—Never touch uninsulated telephone wires or terminals unless the telephone line
has been disconnected at the network interface.
—Use caution when installing or modifying telephone lines.
—Avoid using a telephone (other than a cordless type) during an electrical storm.
There may be a remote risk of electric shock from lightning.
—Do not use the telephone to report a gas leak in the vicinity of the leak.

COMSPHERE –48 Vdc Central Office Power Unit
COctober 2002 3000-A2-GB41-50
Notices
!WARNING:
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which
case the user will be required to correct the interference at his own expense.
The authority to operate this equipment is conditioned by the requirements that no modifications
will be made to the equipment unless the changes or modifications are expressly approved by
Paradyne Corporation.
!WARNING:
To Users of Digital Apparatus in Canada:
This Class A digital apparatus meets all requirements of the Canadian interference-causing
equipment regulations.
Cet appareil numérique de la classe A respecte toutes les exigences du règlement sur le matérial
brouilleur du Canada.

i3000-A2-GB41-50 October 2002
Table of Contents
Preface
Objectives and Reader Assumptions v. . . . . . . . . . . . . . . . . . . . . . . . .
Abstract v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Related Documents v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. Introduction
Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Specifications 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Warranty and Support 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Installation
Overview 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation Considerations 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CO Power Unit Installation 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Filter and Brackets Installation (Optional) 2-20. . . . . . . . . . . . . . . . .

COMSPHERE –48 Vdc Central Office Power Unit
ii October 2002 3000-A2-GB41-50
3. Troubleshooting and Maintenance
Overview 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Indicators and Controls 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Module Replacement Instructions 3-3. . . . . . . . . . . . . . . . . . . . .
Preventive Maintenance 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A. Interface Connections
Glossary
Index

iii3000-A2-GB41-50 October 2002
List of Figures
Figure Page
1-1. Central Office (CO) Power Unit with One Power Module 1-3. . . . . . . . . . . . . . . . . . . .
1-2. Central Office (CO) Power Unit with Two Power Modules 1-3. . . . . . . . . . . . . . . . . . .
2-1. Installing the Optional Second Power Module 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2. Option Straps (S1 through S5) on the CO Power Unit’s Backplane 2-6. . . . . . . . . . . . .
2-3. CO Power Unit Installation 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4. COMSPHERE 3000 Series Carrier (Rear) 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-5. Using One Power Source and One Input Power Cable for Basic (shown) or
Redundant Mode 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-6. Using Two Separate Power Sources for Independent Mode or Redundant Mode 2-13. .
2-7. Using One Power Source and Two Input Power Cables for Independent Mode or
Redundant Mode 2-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-8. Installing the SDCP 2-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-9. Connecting an NMS Adapter Cable to a Modular 3611 DSU When the DTE
Interface is EIA-232 2-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-10. Connecting an NMS Adapter Cable to a Modular 3611 DSU When the DTE
Interface is V.35 2-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-11. Air Filter Brackets Installation 2-21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1. LED Status Indicators 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2. Replacing a Power Module 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-1. CO Power Unit (Rear) A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-2. Connector Housing and Contact A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-3. NMS Adapter Cable (Feature Number 3000-F2-510) A-6. . . . . . . . . . . . . . . . . . . . . . . .

COMSPHERE –48 Vdc Central Office Power Unit
iv October 2002 3000-A2-GB41-50
List of Tables
Table Page
1-1 Technical Specifications for Central Office (CO) Power Unit 1-4. . . . . . . . . . . . . . . . .
2-1 Maximum Ambient Temperatures Permitted 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2 Settings for Basic Mode 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3 Settings for Independent Mode 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4 Settings for Redundant Mode Using a Single –48 Vdc Power Source and a Single
Input Power Cable 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-5 Settings for Redundant Mode with Either a Single Power Source and Two Input
Power Cables, or Two Separate Power Sources and Two Input Power Cables 2-7. . . . .
2-6 Jumper Settings 2-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-1 Pin Assignments of the DC Inputs A-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-2 AMP Part Numbers A-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-3 Pin Assignments for the CO Alarm System Outputs A-4. . . . . . . . . . . . . . . . . . . . . . . . .
A-4 Pin Assignments for the NMS Adapter Cable A-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

v3000-A2-GB41–50 October 2002
Preface
Objectives and Reader
Assumptions
This guide contains installation information for the
COMSPHEREr–48 Vdc Central Office (CO) Power Unit
which is designed to be used with COMSPHERE
3000 Series Carriers.
It is assumed that you are familiar with the functional
operation of data equipment, digital network services,
data service units (DSUs), dial/lease modems, T1 channel
service units (CSUs) and T1 data service units/channel
service units (DSU/CSUs).
Abstract
Chapter 1 provides descriptive information about the
–48 Vdc CO Power Unit.
Chapter 2 provides installation consideration
information and procedures for installing an optional
second power module, setting the option straps, installing
the –48 Vdc CO Power Unit, providing power to the
power unit, installing a Shared Diagnostic Control Panel
(SDCP), connecting to a CO Alarm System or a
COMSPHERE 6800 Series Network Management System
(NMS), and installing an optional air filter and brackets.
Chapter 3 describes the status indicators on the
faceplate of the power module. It also provides
troubleshooting guidelines and replacement instructions
for the power module, and a preventive maintenance
schedule for the optional air filter.
Appendix A contains interface connector pin
assignment information.
The Glossary provides definitions for acronyms and
product-specific terms used in this guide.
The Index lists key terms, acronyms, concepts, and
sections in alphaorder.
Related Documents
3000-A2-GA31 COMSPHERE 3000 Series
Carrier Installation Manual
Contact your sales or service representative to order
additional product documentation.
Paradyne documents are also available on the World Wide
Web at:
http://www.paradyne.com
Select Service & Support –> Technical Manuals

COMSPHERE –48 Vdc Central Office Power Unit
vi October 2002 3000-A2-GB41-50

1-13000-A2-GB41-50 October 2002
Introduction
Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Feature 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Specifications. 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Warranty and Support 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview
The COMSPHERE –48 Vdc Central Office (CO)
Power Unit is designed to provide low voltage dc power
to any data communication equipment (DCE) operating in
a COMSPHERE 3000 Series Carrier.
The –48 Vdc CO Power Unit (hereafter referred to as
the CO Power Unit) consists of the following
components:
•One CO power tray with mounted backplane
•One power module
•Two backplane connector cable assemblies
•Two air filter brackets
•One installation kit which includes the following:
—Two dc input connector housings and six
contacts for the customer-supplied dc input
cable
—Four air filter bracket screws
—Two nylon cable ties
You must supply the following related components:
•A second power module, if desired.
•One or two –48V power input cables. The required
number of input cables depends upon your
configuration.
•One air filter, if needed.
•Alarm cables and NMS adapter cable, if needed.
These components are used to connect the CO
Power Unit to a CO alarm system and/or a
COMSPHERE 6800 Series Network Management
System (NMS) through a Modular 3611 Data
Service Unit (DSU).
(A Modular 3611 DSU has a row of contacts on the
rear edge of the circuit card and is shipped with a
rear connector plate. The rear connector plate
allows the removal of a Modular 3611 DSU from
the front of the carrier without first disconnecting
the DTE cables at the rear of the carrier. The NMS
adapter cable is only compatible with the Modular
3611 DSU. For more information on the Modular
3611 DSU, see the COMSPHERE 3600 Series Data
Service Units, Models 3610 and 3611, Operator’s
Guide.)
The total number of components required depends
upon your configuration. The ACCULINK 3151
CSUs and 3161 DSU/CSUs do not support
forwarding of CO Power Unit alarms to a 6800
Series NMS.
The CO Power Unit can send alarms to a CO alarm
system and a 6800 Series NMS simultaneously. To
connect to a CO alarm system, you need one
customer-supplied alarm cable for each power
module. To forward alarms to a 6800 Series NMS,
you need one Modular 3611 DSU (configured to
forward alarms to a 6800 Series NMS) and one
NMS adapter cable. You can also use a
non-modular Model 3611 DSU, but you must build
your own cable. This guide provides information on
forwarding alarms to a 6800 Series NMS via a
Modular 3611 DSU, but reminds you that a
non-modular Model 3611 DSU can also be used.
1

COMSPHERE –48 Vdc Central Office Power Unit
1-2 October 2002 3000-A2-GB41-50
NOTE
Customer-supplied cable
assemblies must comply with
items 5 and 6 of the Important
Safety Instructions at the front of
this guide.
For more information on the alarm cables and NMS
adapter cable, see Appendix A of this guide.
Part numbers for the CO Power Unit and its related
components are listed in Appendix B of this guide.
Features
The CO Power Unit provides the following features:
•Enables DCEs supported by the COMSPHERE
3000 Series Carrier to operate in a –48 Vdc central
office environment.
•Provides the following three modes of operation:
—Basic mode –the mode in which the single
power module supplies power to the entire
carrier. This mode of operation is the only
mode available for the CO Power Unit with one
power module.
—Redundant mode –the mode in which two
power modules supply power to the entire
carrier. If one power module fails, the
remaining power module assumes the full load
of the carrier. To operate in this mode of
operation, you must install an optional second
power module in the CO Power Unit.
—Independent mode –the mode in which each
of the two power modules supplies power to
one-half of the carrier. To operate in this mode
of operation, you must install an optional
second power module in the CO Power Unit.
•Provides forced air cooling for the carrier via a
–48 Vdc fan in the power module.
•Provides an optional air filter which prevents dust
from entering the CO Power Unit and the
COMSPHERE 3000 Series Carrier.
•Detects power module and fan failures by
monitoring the power output levels and the fan’s
low-speed sensor for proper operation of the power
module. When a failure occurs, an alarm indication
light appears on the power module’s faceplate.
•Sends power failure and/or fan failure alarms to a
CO alarm system and/or a 6800 Series NMS via a
Modular 3611 DSU.
Figure 1-1 illustrates the CO Power Unit with one
power module in the left side of the CO power tray. In
Basic mode, the single power module can be installed in
either the left or right side of the CO power tray.
Figure 1-2 illustrates the CO Power Unit with two power
modules.

Introduction
1-33000-A2-GB41-50 October 2002
Power
Module
Fan
CO Power Unit
Backplane
CO Power
Tray
Captive
Screws
Power
Module
Handle
98-13758-01
Power
Fan Alarm
3000 DC Power Module
Captive
Screws
Figure 1-1. Central Office (CO) Power Unit with One Power Module
Left
Power
Module
Fan
CO Power Unit
Backplane
Right
Power
Module
CO Power
Tray
Power
Module
Handle
Power
Module
Handle
Fan
98-13694-01
Power
Fan Alarm
3000 DCPower Module
Power
Fan Alarm
3000 DCPower Module
Captive
Screws
Captive
Screws
Figure 1-2. Central Office (CO) Power Unit with Two Power Modules

COMSPHERE –48 Vdc Central Office Power Unit
1-4 October 2002 3000-A2-GB41-50
Technical Specifications
Technical specifications for the CO Power Unit (which
includes one power module) are listed in Table 1-1.
Table 1-1
(1 of 2)
Technical Specifications for Central Office (CO) Power Unit
Technical Specifications Criteria
ENVIRONMENT
Operating Temperature
Relative Humidity
Storage Temperature
Shock and Vibration
32°F (0°C) to 122°F (50°C) (See the Installation Considerations
section in Chapter 2 for additional operating temperature limits.)
5% to 95% (noncondensing)
–4°F (–20°C) to 158 5F (70°C)
Withstands normal shipping and handling
POWER REQUIREMENTS
CO Power Unit (with 16 fully equipped
3611 DSUs in the carrier)
CO Power Unit (with 16 fully equipped
3151 CSUs in the carrier)
CO Power Unit (with 16 fully equipped
3161 DSU/CSUs in the carrier)
–60 Vdc to –40 Vdc (4.5 amps maximum)
–60 Vdc to –40 Vdc (2.3 amps maximum)
–60 Vdc to –40 Vdc (4.8 amps maximum)
HEAT DISSIPATION (MAX.) AT
–48 Vdc
CO Power Unit (with 16 fully equipped
cards in the carrier) 160 watts (CO Power Unit efficiency is approximately 76%)
PHYSICAL DIMENSIONS
CO Power Unit
Height
Height (including air filter brackets)
Width
Depth
Power Module
Height
Width
Depth
Air Filter
Height
Width
Depth
2.4 inches ( 6.2 cm)
3.0 inches ( 7.7 cm)
16.9 inches (43.3 cm)
13.5 inches (34.6 cm)
2.4 inches ( 6.2 cm)
8.5 inches (21.8 cm)
11.7 inches (30.0 cm)
0.5 inches ( 1.3 cm)
14.2 inches (36.4 cm)
5.5 inches (14.1 cm)

Introduction
1-53000-A2-GB41-50 October 2002
Table 1-1
(2 of 2)
Technical Specifications for Central Office (CO) Power Unit
Technical Specifications Criteria
WEIGHT
CO Power Unit
(includes one power module)
CO Power Unit
(includes two power modules)
Power Module
Air Filter
10.6 pounds (4.8 kg)
15.8 pounds ( 7.2 kg)
5.2 pounds ( 2.4 kg)
0.2 pounds ( 0.1 kg)
CENTRAL OFFICE (CO) ALARM
RELAY CONTACTS 0.1 amp maximum at 70 Vdc maximum
APPROVALS
Underwriters Laboratories, Inc. (UL)
Recognized Component
Canadian Standards Association (CSA)
Certified Component
Recognized component as part of 3000 Series Carrier, UL 1950
Certified Component as part of 3000 Series Carrier, CSA 22.2
No. 950
Equipment Warranty
and Support
If you experience trouble with this equipment, please
contact your sales or service representative (as
appropriate) for repair or warranty information. If the
product needs to be returned to the company service
center for repair, contact them directly for return
instructions using one of the following methods:
•Via the Internet: Visit the Paradyne World Wide
Web site at http://www.paradyne.com
•Via Telephone: Call our automated call system to
receive current information via fax or to speak with
a company representative.
—Within the U.S.A., call 1-800-870-2221
—Outside the U.S.A., call 727-530-2340
If the trouble is causing harm to the telephone
network, the telephone company may request that
you remove the equipment from the network until
the problem is resolved.

COMSPHERE –48 Vdc Central Office Power Unit
1-6 October 2002 3000-A2-GB41-50
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2-13000-A2-GB41-50 October 2002
Installation
Overview 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation Considerations 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Basic Mode of Operation 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Independent Mode of Operation 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Redundant Mode of Operation 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Alarm Forwarding to a 6800 Series NMS 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CO Power Unit Installation 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the Optional Second Power Module 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting the Option Straps 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing the CO Power Unit 2-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Providing Power to a CO Power Unit 2-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing an SDCP 2-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting the Alarm Contacts to a CO Alarm System 2-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Connecting the Alarm Contacts to a 6800 Series NMS Via a Modular 3611 DSU 2-18. . . . . . . . . . . . . . .
Air Filter and Brackets Installation (Optional) 2-21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview
The CO Power Unit consists of one power module in a
CO power tray. When installed, the CO Power Unit
provides low voltage dc power to the DCEs in the carrier.
This chapter provides information on how to install the
CO Power Unit into a COMSPHERE 3000 Series Carrier.
Installation Considerations
The CO Power Unit is shipped with one power module
and operates in Basic mode. With an optional second
power module the CO Power Unit can be configured to
operate in either Independent mode or Redundant mode.
If you order a second power module for your CO Power
Unit, you must determine the mode in which you wish to
operate before installing the CO Power Unit.
NOTE
The CO Power Unit installation
procedure must be performed
by a qualified service personnel.
In addition, if you want to forward alarms to a
6800 Series Network Management System (NMS), you
must connect the CO Power Unit to the external leads of a
Modular 3611 DSU. Model 3151 CSUs and Model 3161
DSU/CSUs do not support forwarding of CO Power Unit
alarms to a 6800 Series NMS. To access these external
leads, use an NMS adapter cable to connect the external
leads of a Modular 3611 DSU to the CO Power Unit.
This section describes the three modes of operation and
provides information you need to know in order to send
alarms to a 6800 Series NMS.
Basic Mode of Operation
The CO Power Unit with one power module operates
in Basic mode. In this mode of operation, the single power
module supplies power to the entire carrier.
When stacking multiple carriers equipped with CO
Power Units with single power modules, you must install
the power module in each of the CO Power Units in
alternating sequence (that is, left side, right side, left side,
right side, etc.) for proper cooling. For example, if the CO
Power Unit in the bottom carrier has its power module
installed in the left side of the CO power tray, the carrier
2

COMSPHERE –48 Vdc Central Office Power Unit
2-2 October 2002 3000-A2-GB41-50
directly above the bottom carrier should have its power
module installed in the right side of its CO power tray.
Then, the next carrier directly above should have its
power module installed in the left side of its CO power
tray, and so on for the remainder of the carriers in the
cabinet. For information on removing and installing a
power module, see the Power Module Replacement
Instructions section in Chapter 3.
With the power modules placed in alternating
sequence, the maximum operating ambient temperatures
listed in Table 2-1 are permitted.
Independent Mode of Operation
In the Independent mode of operation, the left power
module (as viewed from the front of the carrier) powers
Slots 1 through 8 of the carrier and the right power
module powers Slots 9 through 16 of the carrier. The
Shared Diagnostic Unit (SDU), contained in Slot 0, is
powered by both power modules. If a power module fails,
only the service to that side of the carrier is disrupted. The
other side of the carrier is unaffected. Do not remove a
failed power module until a replacement is available. To
replace a power module, see the Power Module
Replacement Instructions section in Chapter 3 of this
guide.
When the power modules are configured for
Independent mode of operation, up to six carriers can be
mounted in a cabinet. The maximum ambient temperature
is 50°C.
The –48 Vdc input can be provided in one of two
powering options:
•Using two separate –48 Vdc power sources and two
input power cables.
•Using one –48 Vdc power source and two input
power cables.
For maximum reliability, use the first option. For more
information on these powering options, see the Providing
Power to a CO Power Unit section.
To change the mode of operation, see the Setting the
Option Straps section.
Table 2-1
Maximum Ambient Temperatures Permitted
Maximum Allowable Number of Stacked COMSPHERE 3000 Series
Carriers in a Cabinet
Maxim
u
m
Ambient
Temperature 3551 and 3611 DSUs
without DBMs, 3511
DSUs, 3151 and CSUs2
3551, 3611, and 3616
DSUs with DBMs and
3811 Modems23161 DSU/CSUs1
122°F (50°C) 4 2 See Note 4
113°F (45°C) 5 3 13, 2
104°F (40°C) 6 4 3
ă95°F (35°C) 6 5 4
86°F (30°C) 6 5 5
77°F (25°C) 6 6 6
NOTES:
1These operating ambient temperatures can be increased by 5°C by placing 3161 DSU/CSUs in cooler
slots (2, 3, 4, 5, 10, 11, 12, 13), or by leaving a slot empty next to each 3161 DSU/CSU.
2Use the strictest cooling requirements when there is a mixture of units installed.
3Requires a power module on each side, otherwise the ambient temperature must be restricted to 35°C.
4A single carrier, equipped with two power modules, can operate at 50°C provided the cooler slots (2, 3, 4,
5, 10, 11, 12, 13) are used.

Installation
2-33000-A2-GB41-50 October 2002
Redundant Mode of Operation
In the Redundant mode of operation, both power
modules share the load (that is, both modules supply
power to all slots in the carrier). If one power module
fails, the remaining power module assumes the full load
of the carrier. Operation of the CO Power Unit continues,
but it is recommended that you replace the failed power
module as soon as possible. Do not remove a failed power
module until a replacement is available. For instructions
on how to replace a power module, see the Power Module
Replacement Instructions section in Chapter 3 of this
guide.
When the power modules are configured for
Redundant mode of operation, up to four carriers can be
mounted in a cabinet and meet the stated maximum
temperature operating limits of 50°C. The reduction of
carriers per cabinet is necessary to compensate for the loss
of cooling capability if one of the power modules fails. If
the operating temperature limit in the room is less than
45°C, then up to five carriers can be mounted in a cabinet.
If the operating temperature limit in the room is less than
40°C, then up to six carriers can be mounted in a cabinet.
The –48 Vdc input can be provided in one of three
power options:
•Using one –48 Vdc power source and one fused
input power cable.
•Using one –48 Vdc power source and two fused
input power cables.
•Using two separate –48 Vdc power sources and two
fused input power cables.
The second power option is more reliable than the first
power option because it protects the CO Power Unit
against a short circuit failure in the input circuit of one
power module from interrupting the power source to the
other power module. However, the third power option is
the most reliable for the Redundant mode of operation
because it protects against short circuit and input power
failures. For more information on these powering options,
see the Providing Power to a CO Power Unit section. To
change the mode of operation, see the Setting the Option
Straps section.
Alarm Forwarding to a 6800 Series NMS
In order to send power module failure and fan failure
alarm signals to a 6800 Series NMS, you must have a
Modular 3611 DSU (configured to forward alarms to a
6800 Series NMS) and an NMS adapter cable.
(Model 3151 CSUs and Model 3161 DSU/CSUs do not
support this feature.) When these components are properly
configured and alarm conditions occur, alarm signals are
sent to the 3611 DSU and then routed to the 6800 Series
NMS where an alarm event is reported to the NMS
operator. (Remember, you can also use a nonmodular
Model 3611 DSU, but you must build your own adapter
cable to connect Pin 9 of the EIA 25-pin male connector
to Pin 6 of the modular plug for the +12 Vdc source,
Pin 19 of the EIA 25-pin male connector to Pin 2 of the
modular plug for the fan alarm, and Pin 23 of the EIA
25-pin male connector to Pin 1 of the modular plug for the
power alarm).
For the Basic or Independent mode of operation, the
Modular 3611 DSU (configured for alarm forwarding)
must be installed in a different carrier in the cabinet (that
is, a carrier in the cabinet other than the one you want to
manage). This arrangement enables you to send alarms to
the 6800 Series NMS even if one of the CO Power Unit’s
power modules fails. If the Modular 3611 DSU is installed
in the same carrier, a power module failure will disrupt
alarm forwarding to the 6800 Series NMS. In the
Independent mode of operation, a power module failure
disrupts service to one-half of the carrier. If that half of
the carrier contains the Modular 3611 DSU (configured
for alarm forwarding), then the DSU is inoperable and is
unable to forward alarms.
NOTE
In the Redundant mode of
operation, you may want to
install the Modular 3611 DSU
(configured for alarm forwarding)
in a different carrier in the cabinet
in the unlikely event of a double
power module failure.
For information on connecting the CO Power Unit to a
6800 Series NMS, see the Connecting the Alarm Contacts
to a 6800 Series NMS section.

COMSPHERE –48 Vdc Central Office Power Unit
2-4 October 2002 3000-A2-GB41-50
CO Power Unit Installation
The CO Power Unit is installed at the bottom of the
carrier. You will need a large, flat-blade screwdriver to
install the CO Power Unit and a medium, flat-blade
screwdriver to set the option straps.
NOTE
If you plan to use two power
modules in your CO Power Unit,
you must install the second
power module before proceeding
to Step 1. (See the Installing the
Optional Second Power Module
section.)
The following is an overview of the CO Power Unit
installation procedure:
"Procedure
1. Set the option straps on the CO Power Unit’s
backplane to the desired mode of operation. (See
the Setting the Option Straps section.)
If your CO Power Unit has a single power
module, you do not need to set the option straps.
The option straps are factory set for the Basic
mode of operation. However, you should compare
the option strap setting on backplane to the strap
settings listed in Table 2-2 in the Setting the
Option Straps section to ensure correct settings.
2. Install the CO Power Unit into the carrier. (See the
Installing the CO Power Unit section.)
3. Provide power to the CO Power Unit. (See the
Providing Power to a CO Power Unit section.)
4. Install the Shared Diagnostic Control Panel
(SDCP) on the carrier in which you installed the
CO Power Unit, if desired. (See the Installing an
SDCP section.)
5. Connect the alarm contacts for the CO Power Unit
to a CO alarm system and/or a Modular 3611
DSU, if desired. (See the Connecting the Alarm
Contacts to a CO Alarm System section or the
Connecting the Alarm Contacts to a 6800 Series
NMS Via a Modular 3611 DSU section.)
Steps 4 and 5 are optional.
Installing the Optional Second Power
Module
You can order a second power module for your CO
Power Unit. This additional power module allows you to
choose between two modes of operation: Redundant or
Independent. You must install the optional second power
module into the CO power tray before installing the CO
Power Unit into the carrier.
To install the optional second power module:
"Procedure
1. Remove the coverplate by loosening the two
captive screws on the bottom of the coverplate.
2. Place the second power module in the card guides
on the right side of the CO power tray (as viewed
from the front of the tray) and then slide power
module to the rear of tray. See Figure 2-1.
3. Tighten the two captive screws on the bottom of
the power module’s faceplate.