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
cabinet.
Label Connectors on Back Cover
Each cabinet has twelve 25-pair receptacles across the bottom of the rear
panel.These connectors link the CPs inside the cabinet to the Station
Interconnect Panel (SIP) and Trunk Access Equipment (TAE). The connectors
are numbered from 1 to 12 and correspond to the CP slots.
Using a felt-tipped pen, write the CP code for each slot in the box above the
connector number on the lower rear cover.
2-28 
						

							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 ZTN129
or ZTN130 (R3) CP. This CP is always in slot 1 of Cabinet 1. The other end of
the TDM bus is terminated by a Bus Terminator that plugs into the upper pin
field of the topmost carrier (which may, of course, be the only cabinet). These
connections are shown in Figure 2-13.
Whenever a cabinet is added, the Bus Terminator must be moved to the end
of the bus on the new top cabinet.This can be either slot 1 or slot 12,
depending on the number of cabinets and how the TDM bus extender cable
is run.
When removing a Bus Terminator and TDM bus extender cable,
to bend the backplane pins.
1.Verify that the Bus Terminator is in the proper position:
l Slot 12 of Cabinet 1 for 1-cabinet systems
l Slot 1 of Cabinet 2 for 2-cabinet systems
l Slot 12 of Cabinet 3 for 3-cabinet systems.
take care not
2. See Note. For 2- and 3-cabinet systems, install extender cable
between slot 12 of Cabinet 1 and slot 12 of Cabinet 2. For 3-cabinet
systems, install another extender cable between slot 1 of Cabinet 2
and slot 1 of Cabinet 3.
Note:When properly installed, the light blue stripe on the
extender cable is at the bottom of the cable and the
lettering on the cable (SER=1, for example, is right
2-30 
						

							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.)
POWER UP AND INITIALIZE SYSTEM
Separate power cords for each cabinet must be plugged into the designated
quad outlets.Peripheral equipment (SAT, SMDR [Station Message Detail
Recording], or CAS [Call Accounting System], DTU and CSU [Customer
Service Unit]) collocated with the switch cabinet(s) must also be plugged into
these ac outlets.
Connect Power
1.
2.
3.
4.
Make sure the rear panel is in place on each cabinet.
Connect the receptacle end of a 3-wire power cord to the plug at the
rear of each cabinet.
Connect the power cord’s plug end to the quad ac outlet for each
cabinet.
Recheck the electrical and ground connections.
Danger: Once power is applied, do not put your hands or
any tools into the cabinet.
2-33 
						

							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 connections as shown in Figure 2-14 to the SAT and
Note:The direct octopus cable connections are only temporary.
All permanentconnections to peripheral and station
LEGEND :
ZTN129 -
cl -
355A ADAPTER -
355AF ADAPTER -
NOTE :CPU/MEMORY CP
OCTOPUS CABLE ( WP90780 )
RS-232 PLUG TO MODULAR JACK
RS-232 RECEPTACLE TO MODULAR JACK
LEG 1 CONNECTS TO SAT; LEG 3 CONNECTS TO DTU.
Figure 2-14.Temporary SAT and DTU Connections
2-34 
						

							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 from the System 25 default plan. You do not
have to delete the default codes before you enter the true dial plan. See the
Administration Manual (555-540-500) for a listing of default translations
provided in Release 3 systems.
The time required for a cold start depends on the number of CPs in the
system, but is usually several minutes.A limited cold start takes about 30
seconds.
Follow these steps to manually start the system from the SAT:
1.
2.
3.
4.
5.
6.
Connect the SAT to the CPU/Memory CP administration port, (leg 1
of the octopus cable).
If the SAT has a selectable baud rate, set it to 1200 baud.
Be sure transmission parity is set to none, with the parity bit set to
space (0).
Turn the terminal on and press the carriage return key once or twice.
On most terminals, this key is  or .
After communication with the system is established, a prompt is
displayed:
Enter Password ->
Enter SYSTEM25 and press . The main menu will now
be displayed along with the prompt:
Make one selection from menu ->
Enter 9 (for the SAVE/RESTORE selection) and press .
2-35 
						

							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 the backspace key. Each time you
press the backspace key, one character is erased.
2-36