Nortel SONET AccessNode User manual

P0887749
SONET Products
AccessNode
ABM Bay Cable Connection Quick Reference
Guide
Issue 1.0 February 1999
Front cover

AccessNode ABM Bay Cable Connection Quick Reference Guide Issue 1.0
Title page
SONET Products
AccessNode
ABM Bay Cable Connection Quick Reference
Guide
Document release: Issue 1.0
Date: February 1999
Copyright  1998–1999 Northern Telecom, All Rights Reserved.
Printed in Canada
All information contained in this document is subject to change without notice. Northern Telecom reserves the
right to make changes to equipment design or program components, as progress in engineering, manufacturing
methods, or other circumstances may warrant.
ACCESSNODE, NORTEL, and NORTEL NETWORKS are trademarks of Northern Telecom.

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Publication history
February 1999
Release-independent Standard Issue 1.0 of the document.
Note: With the February 1999 release, references to the software release
number (such as AN15 or AN16) have been deleted, making this
document release-independent. This document will be rereleased only
when technical changes occur.
June 1998
AN15 Standard 01.01 release of the document.
February 1998
AN14 Standard release of the document.

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Contents
About this document vii
Audience vii
Related documentation vii
ABM bay ac power requirements 1-1
AC power grounding environments 1-1
AC power feed requirements 1-1
Utility receptacles (ac) 1-2
Receptacles (ac) in a CBN 1-2
Receptacles (ac) in an IBN 1-2
ABM bay grounding schemes 2-1
Grounding schemes 2-1
Central office CBN engineering rules 2-2
Remote CBN engineering rules 2-4
Central office IBN engineering rules 2-6
Remote IBN engineering rules 2-8
ABM bay frame ground 2-10
ABM bay dc power requirements and connection 3-1
Protection against transient voltages 3-1
Calculating capacitor values 3-2
Main power cables for ABM bays 3-2
NT4K84UA main power cable (4 cables for each bay) 3-3
Power redundancy in bays equipped with ABM shelves 3-4
Feeder voltage drop in bays equipped with ABM shelves 3-4

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ABM bay connections 4-1
ABM bay intershelf and external cabling connections 4-1
ABM bay intershelf cabling connections 4-2
ABM bay external cabling connections 4-5
Index 5-1

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About this document
This document presents the essential cabling and connection information for
access bandwidth manager (ABM) bays in all configurations. It is a quick
reference to help installers in planning the installation of an ABM bay.
Note: This document should be used to support the Bay in Central Office
Installation Manual - ABM , 323-3001-201, in the AccessNode
documentation suite (separately bound).
Audience
Users of this document should be familiar with the job specifications for the
ABM bay application and configuration they are installing. Users should also
know telecommunications industry installation practices and be familiar with
the tools required to complete the tasks.
Related documentation
For additional information related to theABM bay and its applications and
configurations, see the following documents:
Engineering, Configuration, and Ordering Guide,Volume 1
• Engineering and Ordering Information , 323-3001-032
• Mapper Layouts Planning Guide , 323-3001-154
• Site Installation Planning and Engineering , 323-3001-200
Description,Volume 2A
• Configuration and Equipment Description , 323-3001-100
• Features and Services Description , 323-3001-101

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AccessNode Express volume, separately bound
• AccessNode Express Customer Ordering Guide , 323-3051-032
• AccessNode Express Configuration and Equipment Description ,
323-3051-100

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ABM bay ac power requirements1-
This chapter describes the ac power requirements for the access bandwidth
manager (ABM) bay.
Note: For complete information on the ac power requirements of the
ABMbay,see Site Installation Planningand Engineering ,323-3001-200
in the Engineering, Configuration, and Ordering Guide , Volume 1.
AC power grounding environments
The ABM bay can be used in both isolated bonding network (IBN) and
common bonding network (CBN) grounding environments. For CBN
environments, Nortel Networks recommends that you use a dedicated ac
panel for feeding communication equipment and utility receptacles. For IBN
grounding environments, you must use a dedicated ac panel for feeding
communication equipment and utility receptacles.
AC power feed requirements
The sizes of ac entrance and distribution feed cables must conform with
information given in national electrical codes, as follows:
• For the United States: Table 250-94, of the National Electrical Code
(NEC)
• For Canada: Table 17, of the Canadian Electrical Code (CEC)
Unlessotherwise specified bythe operating companyorlocalelectrical codes,
the preferred wiring is metal-clad flexible cable.
The ac distribution panel and cabling must be installed by a licensed
electrician in accordance with the national and local codes.

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Utility receptacles (ac)
Utility ac receptacles can be installed on theAccessNode bays or on the walls
of the installation room, and can be of one of the two following types:
• standard receptacle for 3 conductors (Neutral, Line 1, and Line 2) and ac
equipment ground (ACEG). Use insulated metal-clad cable with 4
conductors: L1, L2, N, and ACEG
• isolated-ground receptacle (orange) for 4 conductors (L1, L2, N, and
dedicated ACEG). Use insulated metal-clad cable with 5 conductors:
L1, L2, N, dedicated ACEG and ACEG.
Boxes for receptacles installed on the bays can either be bolted directly to the
bays or can be mounted on insulators to isolate them from frame ground.
Unless otherwise specified by the operating company or by local codes, the
preferred method is to use standard 3-conductor receptacles, and when the
receptacles are mounted on the bays, to use receptacle boxes that are not
isolated from frame ground.
Receptacles (ac) in a CBN
In a CBN, receptacles on the bays or on the walls of the installation room
should be bonded to the same floor ground bar (FGB) as theAccessNode. For
an illustration of the grounding scheme for ac receptacles in a CBN, see
Figure 1-1 on page 1-3.
Receptacles (ac) in an IBN
In an IBN, Nortel Networks recommends that you bond the utility receptacles
that are mounted on the bays to the single point ground (SPG). Also, you
should bond receptacles that are mounted on the walls of the installation room
within 2 m (7 ft) of the bays to the SPG. If they are not bonded to the SPG,
the receptacles must be further than 2 m (7 ft) from the bays. For an
illustration of the grounding scheme for ac receptacles in an IBN, see
Figure 1-2 on page 1-4.

ABM bay ac power requirements 1-3
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Figure 1-1
CBN ac power distribution and utility receptacle ground wiring scheme
ACEG
Note 2: In compact installations, such as customer-located equipment, the building principal ground
(BPG) reference serves the same functions as the FGB, and a secondary ac panel is not used.
Secondary ac
panel
ACEG Building principal
ground (BPG)
(See Note 2)
Floor
ground bar
(FGB)
ACEG
Standard receptacle
Isolated ground
receptacle (orange)
ACEG
L
N
Insulated metal-clad cable unless
otherwise required by the customer
Other grounds
(See Note 1)
LN
(See Note 1)
Insulated metal clad cable or
insulated conduit unless otherwise
required by the customer
AC feed in conduit or armored cable:
- L, N, and ACEG for 120 V ac;
- L1, L2, N, and ACEG for 208/240 V ac
Note 1: For standard utility receptacles, 3 conductors are wired (L, N, and ACEG). For the
isolated-ground receptacles, (orange) 4 conductors are wired to include a dedicated ACEG lead.
Primary ac panel
Unlessotherwisespecifiedbytheoperatingcompany
or by local codes, the receptacles are standard
3-conductor receptacles and the receptacle boxes
are not insulated from frame ground.
Dedicated ACEG

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Figure 1-2
IBN ac power distribution and utility receptacle ground wiring scheme
Note 2: In compact installations, such as customer-located equipment, the building principal
ground (BPG) reference serves the same functions as the SPG, and the ac primary panel is also
the dedicated panel within the isolated bonding network (IBN).
Dedicated
ac panel
ACEG Building principal
ground (BPG)
(See Note 2)
SPG
ACEG
Standard receptacle
Isolated ground
receptacle (orange)
ACEG
ACEG
Dedicated ACEG
L
N
Insulated metal-clad cable unless
otherwise required by the customer
Unless otherwise specified by the
operating company or by local codes, the
receptacles are standard 3-conductor
receptacles and the receptacle boxes are
not insulated from frame ground.
Other grounds
within the office
IBN
(See Note 1)
LN
(See Note 1)
Insulated metal clad cable
orinsulatedconduitunless
otherwise required by the
customer
AC feed in conduit or armored cable:
- L, N, and ACEG for 120 V ac;
- L1, L2, N, and ACEG for 208/240 V ac
Note 1: For standard utility receptacles, 3 conductors are wired (L, N, and ACEG). For the
isolated-ground receptacles (orange) 4 conductors are wired to include a dedicated ACEG lead.
Primary ac panel
Isolated bonding network

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ABM bay grounding schemes 2-
This chapter describes grounding schemes for an access bandwidth manager
(ABM) bay.
Note: For complete information about the grounding requirements of the
ABM bay, see “Power and ground distribution” in Site Installation
Planning and Engineering , 323-3001-200, in the Engineering,
Configuration, and Ordering Guide , Volume 1.
Grounding schemes
AccessNode equipment can be installed in a common bonding network
(CBN) or in an isolated bonding network (IBN). A CBN is the most common
grounding network used with transmission equipment.
With the use of line interface cards and external copper access lines, large
transient currents caused by certain events, such as lightning storms, and ac or
dc power line faults, can be expected to flow through the shared system
grounds. The resulting disturbances can affect AccessNode and any other
interconnected systems. Therefore, it is important that the shared grounding
scheme, involving battery leads, ac grounding, logic ground, and frame
ground, be installed correctly.
Note 1:
On all external lines, first-order protection is required, as
provided by gas discharge tube or carbon block protection.
Note 2: Installation according to the NT Corporate Standard 4122.00,
“Grounding of Communication Systems,” is mandatory.
The following grounding schemes are shown in this chapter:
• Figure 2-1 on page 2-3 shows the use of CBN in central office locations
• Figure 2-2 on page 2-5 shows the use of CBN in remote locations
• Figure 2-3 on page 2-7 shows the use of IBN in central office locations
• Figure 2-4 on page 2-9 shows the use of IBN in remote locations

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Central office CBN engineering rules
Thefollowingengineeringrulesand requirements applyto central officeCBN
grounding schemes as shown in Figure 2-1 on page 2-3:
• A modem is needed if the distance to the AccessNode terminal is more
than 50 ft, if the AccessNode is located in an IBN, or if the AccessNode
is in located in a different CBN.
• The transmit DS1 cable coming from the DSX-1 cross-connect is
groundedat the DSX-1. The receiveDS1 cable of theDSX-1 isgrounded
at the AccessNode.
• In small buildings, the secondary panel or the building point ground
(BPG) may not exist. In such buildings, the BPG will serve as the FGB
and the primary panel will serve as the secondary panel.
• In small buildings the main distribution frame (MDF) and battery rack
are on the main floor and are connected to the floor ground bar (FGB). In
large buildings, the MDF and battery rack are in the basement and are
connected to the BPG. Any subscriber lines that exit the building must
be protected by gas discharge protectors installed on the MDF and
grounded to the FGB or the BPG.

ABM bay grounding schemes 2-3
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Figure 2-1
Central office common bonding network grounding scheme
RS-232
6 AWG frame
ground lead
2 AWG
collector
Battery return leads (4)
Modem
(see eng. rules)
VF lines
Secondary
ac panel
Frame ground
bar (FGB)
ACEG
ACEG
BDFB and
rectifier
Ground reference for
battery return (BR) bus
ACfeed (L, N,andACEG for120V
ac; L1, L2, N, and ACEG for 240 V
ac) in conduit or armored cable
Battery frame ground
Primary ac
panel
MDF
(See eng.
rules)
AccessNode
120 V for ac
receptacles
Insulated conduit
or insulated
metal-clad cable
Insulated
BR bus
Continuous pair (feed
and return conductors).
One of four pairs shown
+
-
Building principal
ground (BPG)
(See eng. rules)
DS1 cables
DSX-
cross-
connect (see eng. rules)
2 AWG
collector
Same line-up
6 AWG frame
ground lead

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Remote CBN engineering rules
The following engineering rules and requirements apply to remote CBN
grounding schemes as shown in Figure 2-2 on page 2-5:
• The transmit DS1 cable from the DSX-1 is grounded at the DSX-1. The
DSX-1 receive DS1 cable is grounded at the AccessNode.
• Insmall buildings,thefloor ground bar (FGB) does not exist. Instead,the
building principle ground (BPG) serves the same function.
• In small installations, an interconnect panel can serve the same purpose
as the main distribution frame (MDF).Any subscriber lines that exit the
building must be protected by gas discharge protectors installed on the
MDF and grounded to the FGB or the BPG.

ABM bay grounding schemes 2-5
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Figure 2-2
Remote common bonding network grounding scheme
-
Insulated BR bus Same lineup
AccessNode VF lines
6 AWG
frame ground
FGB or
BPG (see
eng. rules)
Battery return leads (4)
Battery frame ground
BR ground reference
(see eng. rules)
120 V or 208/240 V requirements
ACEG
ACfeed, (L,N, andACEGfor
120 V ac, or L1, L2, N, and
ACEG for 240 V ac) in
conduit or armored cable
MDF
(see eng.
rules)
Insulated conduit or insulated
metal-clad cable
Continuous pair (feed and return)
conductors. One of four pairs shown
+
Primary ac
panel
DSX-1 DS1 cables
BDFB
(see eng. rules)

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Central office IBN engineering rules
The following engineering rules and requirements apply to central office IBN
grounding schemes as shown in Figure 2-3 on page 2-7:
• A modem is needed if the distance to the AccessNode terminal is more
than 50 ft, if the AccessNode is located in a CBN, or if the AccessNode
is in located in a different IBN.
• The transmit DS1 cable coming from the DSX-1 cross-connect is
groundedat the DSX-1. The receiveDS1 cable of theDSX-1 isgrounded
at the AccessNode.
• In small buildings the single point ground (SPG) may not exist. In such
buildings, the building point ground (BPG) will serve as the SPG.
• In small buildings, the main distribution frame (MDF) and battery rack
are on the main floor and are connected to the SPG. In large buildings,
the MDF and battery rack are in the basement and are connected to the
BPG. Any subscriber lines that exit the building must be protected by gas
discharge protectors installed on the MDF and grounded to the SPG or
the BPG.