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 adapters is equipped as follows:
l Z210A2—Six 8-pin modular
modular plug-ended D-inside
must be installed at the top
connections for the System
Tape Unit (DTU), etc.
jacks used for terminating 4-pair
wire (DIW). One of these adapters
of column A on the SIP to provide
administration Terminal (SAT), Digital
l 858A—Six 11 O-type 8-pin wiring blocks used for terminating 4-pair
DIW.
WP90851, L1 Y-Adapter
This adapter separates voice and data pairs that are run over
cable for connection through octopus cables to the System
the same 4-pair
25 port circuits.
This adapter plugs into the port side of either of the two adapters described
above. It has a DATA and a VOICE modular jack. The DATA jack connects
to a TN726 Data Line port circuit pack. The VOICE jack connects to a port
circuit on a Tip Ring Line, Analog Line, or ATL Line circuit pack.
2-8 
						

							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 3-pair tie trunk circuits
trunk circuit packs. All 25-pair connectors on theon a 700A jack to two 4-port tie
cable are male.
.
3:1 SPLITTER CABLE
WP90929,L1
2:1 SPLITTER CABLE
WP90929,L3
Figure 2-5.
Splitter Cables 
						

							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 cable consists
of one 25-pair male connector (Connector O) and two 25-pair female connectors
(Connectors 1 and 2). The cable length is eight feet.
CONNECTOR 1
CONNECTOR O
CONNECTOR 2
Figure 2-6a. 853B Adapter Cable
DS1 Connector Cables
The following Connector cables are available to connect the DS1 Interface circuit
packs to DS1 digital facilities:
l H600 307, G2—50-foot long shielded cable equipped with a 50-pin male
connector on one end and unterminated at the other end. The cable
may be cut to length. Shipped loose are a KS23007, L1 15-pin male
2-12 
						

							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 between the DS1 Interface circuit pack and the other
connector cables.
Cable Labels
A set of preprinted labels for identifying the system cabinet cables and ETU
cables are provided (Figure 2-7). The system cable labels are prenumbered to
identify the cabinet (1, 2, 3) and circuit pack slot (1-12, - see NOTE) and are also
color-coded as follows:
Note: Because of the combined CP/Memory board in R2V1 and R3,
ten slots are available in Cabinet 1.
ICabinet No.ColorI
1Blue
2Orange
3Green
The call processor octopus cable labels and ETU cable labels are white. The
use of these labels is discussed in this manual.
2-13 
						

							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
REMOTE
REMOTE
MAINTMAINT
ETU1
ETU1
SWITCH(CPU) 
SWITCH(CPU)
ETU2
ETU2
SWITCH(CPU)SWITCH(CPU)
n
WHITE
AT&T
ETU
CABLELABELS
ETU 1 SIP
ETU 1 SIP
ETU 2 SIPETU 2 SIP
ETU 3 SIPETU 3 SIP
ETU 4 SIP
ETU 4 SIP
ETUSIP
ETUSIP
SWITCH(TRUNK) SWITCH(TRUNK)
SWITCH(TRUNK) SWITCH(TRUNK)
SWITCH(TRUNK) SWITCH(TRUNK)
SWITCH(TRUNK) SWITCH(TRUNK)
SWITCH(LINE) SWITCH(LINE)
SWITCH(LINE) SWITCH(LINE)
SWITCH(LINE)
SWITCH(LINE)
SWITCH(LINE)
SWITCH(LINE)
SWITCHSWITCH
SWITCH
SWITCH
ETU 1 CO
ETU 1 CO
ETU 2 CO
ETU 2 CO
ETU 3 CO
ETU 3 CO
ETU 4 CO
ETU 4 CO
ETU COETU CO
ETU
COETU CO
Figure 2-7.Cable Labels
2-14 
						

							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 96-inch by 3/4-inch plywood panel, mounted horizontally 30-inches
above the floor and within 5 feet of the location chosen for the cabinets.
If wall space in the equipment room is limited, an alternate layout may be
provided. If more than four 617A Panels are required, this alternate layout
will require more than one 48-inch by 96-inch plywood panel. See Install
Equipment Room Station Cabling for details.
Network Interface
The RJ21X network interface (CO lines) installed by the telephone company
must be located within 25 feet of the system cabinets. In addition to the
RJ21X network interface, an RJ2GX interface is required for tie 
lines. For T1
interfaces, RJ48X network interfaces must be provided. 
If System 25 is
replacing another system and no additional lines are required, the network
interfaces used with the previous system should already be in place.
The network interfaces should also include a coupled bonding conductor
extended from the building service entrance.
2-16