ATT System 25 Installation And Maintenance Manual

INSTALLATION
Figure 2-11.Position of Shorting Plugs on CPU/Memory Circuit Pack
2-27 

INSTALLATION
Required Circuit Pack Positions
The required CP positions for Cabinet 1 are:
SLOTCP
1ZTN129 or ZTN130 (R3)
I2IZTN85 or ZTN131 (R3) 
Also, all DID Trunk circuit packs should be installed in Cabinet 1.
There are no other restrictions on CP position in a single-cabinet or
multicabinet system; however, you should refer to the power supply unit load
requirements for the maximum unit loads for each CP type within a single
cabinet.
Caution:Be careful not to exceed unit load restrictions on each...

INSTALLATION
Install 4A Retainer Clips
The 4A retainer clips must be installed on each of the 12 receptacles on the
lower rear panel of the cabinets.To install a clip, position it and insert the
legs in the cabinet as shown in Figure 2-12.
Figure 2-12.4A Retainer Clip Installation
2-29 

INSTALLATION
Connect Cabinets
The Time Division Multiplex (TDM) bus extender cable and the intercabinet
#6 AWG ground wire must be connected between cabinets. The TDM bus
terminates on each side of the cabinet, and the intercabinet #6 AWG ground
wire connects to the ground block at the rear of each cabinet.
Note:Make certain that the address plug is installed in the rear pin
field of each cabinet (see Figure 2-13).
TDM Bus Connections
One end of the TDM bus is terminated by resistors mounted on the...

INSTALLATION
side up).
3.Install the upper rear panels.Route the extender cable between
the slots formed by the upper and lower rear panels.
2-31 

INSTALLATION
TDM
BUS
TERM
CARD
ADDR
PLUG
TDM B
EXTEN
CABLE
ADD
PLU
PLUG
Figure
~CABINET 3
ON/OFF
.SWITCH
AC POWER
# 6 AWG
BUILDING
GROUND
WIRE
CABINET 2
 AC POWER
. #6 AWG
2-13.TDM Bus Terminations (Rear View of 3-Cabinet System)
2-32 

INSTALLATION
Ground Wire Connections
The cabinets are connected to the single-point ground with #6 AWG copper
wires.
(Building ground requirements aredescribed in Preinstallation
Requirements in this section.)
Warning:The cabinet power switches must be set to off.
1.In 2- or 3-cabinet systems, connect a #6 AWG wire between the
ground blocks of Cabinets 1 and 2 and Cabinets 1 and 3.
2. Connect a #6 AWG wire between the ground block of Cabinet 1 and
the single-point ground. (See Figures 2-9 and 2-1 3.)...

INSTALLATION
5.Starting with Cabinet 2 or 3, turn on the power switch on each
cabinet [Cabinet 1 must be last).
IMPORTANT: If power to Cabinet 1 is not turned
cold start initialization may not occur properly.
6.Check to be sure that the cabinet fans are rotating.
Connect Administration Equipment
on last, the
Connect the SAT and DTU to their respective modular jacks on an 858A
Adapter at the SIP.
If the SIP has not yet been installed, connect an octopus cable to Cabinet 1,
slot 1. Make temporary...

INSTALLATION
Cold Start the System
To ensure that the system recognizes the current position of the CPs, you
must cold start the system before beginning initialization. A cold start causes
the system to check all slots for valid CP types and assign default
translations to ail ports (except auxiliary trunk ports).
A limited cold start is available. The limited cold start does not assign default
translations to ports.
The limited cold start is useful if the customer’s dial
plan is significantly different...

INSTALLATION
7. The system will respond with:
Action=
8. Enter 20 for a cold start. The system will respond with:
Save/Restore: Action=20 Data=
9. Enter D. The system will complete the word Data followed by the =
sign.
10.Enter 1 for a cold start or 2 for a limited cold start. The system will
respond with:
Save/Restore: Action=20 Data=1 (or
You are about to initiate a cold start
.
c to continue, any other key to abort
11.Enter c to initiate the cold start.
Data=2)
Typing errors can be erased by pressing...