ATT System 25 Installation And Maintenance Manual

INSTALLATION
MOUNTING CENTERS
WHEN FLANGES ARE
OVERLAPPED
Figure 2-2. 617A Panel
2-7 

INSTALLATION
Adapters
The adapters shown in Figure 2-3 are used at the SIP.
Z210A2 or 858A Adapters
These adapters connect the building wiring (station runs) to the station port
circuit packs (CPs) located in the system cabinets (through octopus cables).
As many as 40 of these adapters may be required for a maximum size
system, Any combination of the adapters can be used, depending upon the
type of building wiring.The port side of the adapters consists of six 8-pin
modular jacks. The station side of the...

INSTALLATION
Z21OA1
ADAPTER
Y-ADAPTER
WP90851,L1
858A
ADAPTER
Figure 2-3.SIP Adapters
2-9 

INSTALLATION
Fanning Strip
The 50A Fanning Strip (Figure 2-4) is a metal panel with positions to hold 16
octopus (switch) cables.The bundled portion of the octopus cable is
anchored at the fanning strip. The eight octopus cable cords hang free. One
fanning strip is required for 1-cabinet systems. Two fanning strips are
required for 2- or 3-cabinet systems.
NOTE : 9“ WIDE, 8-1/2”
WHEN FLANGES ARE
OVERLAPPED MOUNTING CENTERS
Figure 2-4.
50A Fanning Strip
2-10 

INSTALLATION
Cables
Splitter Cables
The splitter cables (Figure 2-5) connect trunk circuits from the 700A jacks to the
system cabinets or 10B ETU (3:1 only).
3:1 Splitter Cable (WP90929, L1)
This cable connects the twenty-four 1-pair trunk circuits on a 700A jack to three
8-port trunk circuit packs (loop start, ground start, or DID). The connection may
be either director through a
are male.
2:1 Splitter Cable (WP90929, L3)
10B ETU. Al 25-pair ribbon connectors on the cable
This cable connects eight...

INSTALLATION
Octopus Cables
Octopus cables (Figure 2-6) connect the station port and CPU/Memory circuit
packs to the SIP adapters. Each cable consists of a 25-pair male connector that
connects to the switch cabinet and eight modular plugs that connect to the SIP
adapters. These cables are provided with all system cabinets.
Figure 2-6.Octopus Cable
8536 Adapter Cable
The 853B Adapter Cable (104305834) connects two octopus cables to a 16-port
TN746B Analog Line circuit pack. As shown on Figure 2-6a, each...

INSTALLATION
connector and a KS23146,L3 50-pin male connector.
To connect a DS1 interface circuit pack to a 551-type
Unit (CSU), field terminate the 15-pin plug.
To connect DS1 tie trunks on co-located System 25s,
50-pin male connector (see Figure 2-1 9).
Customer Service
field terminate the
l C6E connector cable (comcode 104307 434)—1 00-foot long shielded
cable equipped with a 50-pin male connector on one end and a 50-pin
female connector on the other end. This cable is used as an
“extension” cable...

INSTALLATION
AT&T
CAR 1
CABLELABELS
CAB1 SLOT1
CAB1 SLOT1
CAB1 SLOT2
CAB1 SLOT2
CABl SLOT3CAB1 SLOT3
CAB1 SLOT4CAB1 SLOT4
CAB1 SLOT5CAB1 SLOT5
CAB1SLOT6CAB1 SLOT6
CAB1  SLOT7CAB1 SLOT7
CAB1 SLOT8
CAB1SLOT8
CABl SLOT9CAB1SLOT9
CAB1 SLOT10CAB1 SLOT10
CAB1 SLOT11CAB1 SLOT11
CAB1 SLOT12
CAB1 SLOT12
CAB1 SLOTCAB1 SLOT
CAB1 SLOTCAB1SLOT
CAB1 SLOT
CAB1 SLOT
CAB 1
BLUE
CAB 2
- ORANGE
CAB 3 - GREEN
CALLAT&TPROCESSOR
OCTOPUS
CABLELABELS
SYSTEMSYSTEM
ADMINADMIN
TERMTERM
SMDRSMDR
DIGITALDIGITAL
TAPETAPE
UNITUNIT...

INSTALLATION
Symbols Used in Figures
Modular jacks are shown by the triangle symbol. The 25-pair connectors are
indicated by shaded blocks.
Generally, only one leg of an octopus cable is
shown. Unterminated wiring requiring cut down or other termination does not
show symbolic designations.The 103A Connecting Block is a typical
modular wall jack that provides cut-down connections for building (station)
wiring and a modular jack for connection to terminal equipment.
2-15 

INSTALLATION
PREINSTALLATION REQUIREMENTS
The AT&T System 25 Reference Manual (555-540-200) provides a complete
listing of System 25 equipment location requirements. Before installation
begins, check the items described in this section.
Caution:System 25 cross connect hardware must be located in a
restricted access area only.
Table and Backboard
Verify that an equipment table and cross-connect backboard are installed.
(See Figure 2-8 for a sample layout.) The cross-connect backboard is a 48-
inch by...