ATT System 25 Installation And Maintenance Manual

INSTALLATION
Mount 858A or 2210A2 Adapters
To install these adapters, proceed as follows:
1.Using a wide blade screwdriver, pry off the upper adapter mounting
clip on the 617A Panel (Figure 2-18).
2.Fit the mounting clip on the top of the adapter.
3. Fit the adapter in the slot of the lower mounting clip.
4.Press the upper mounting clip back into the panel.
2-47 

INSTALLATION
UPPER ADAPTER
MOUNTING
CLIP
Figure 2-18.Mounting Adapters 

INSTALLATION
INSTALL MODULAR BULK POWER SUPPLY
(Optimal)
The 346 Modular Bulk Power Supply (MBPS) is a cost-effective and flexible
alternative to the KS-2291 1 power supply. The 346 MBPS can be used
where the wall-mounted (outlet) KS-2291 1 power supply cannot be used or
where multiple KS-2291 1 power supplies are required.
The 346 MBPS consists of the 346A Power Unit and 346A1 Power Panel. Up
to three 346A Power Units can be mounted in a power panel. Each 346A
Power Unit is capable of powering four...

INSTALLATION
Tie trunks must be segregated on a separate block because a different
splitter cable is used. Also, off-premises stations must be segregated  one
700A Jack.
The first five trunks in each group of eight (loop start or ground start trunks
only) can be connected through an ETU to five power failure transfer stations.
However, all eight trunks are connected to, and pass through, the ETU.
The ETU also supports a DID make-busy function to the central office’s extra
pair (if required). Relay...

INSTALLATION
Connect Cabinets to TAE Blocks
The connections between the cabinets and the TAE blocks are made using
connectorized splitter cables.Make sure that each trunk group on each
connecting block is connected to the correct type of CP and protected with
its approved secondary protector (as shown in Table 2-B).
Central office trunks associated with emergency transfer and off-premises
stations (OPSs) are not connected directly to the cabinets.If you are
installing trunks that are to be used for OPS,...

INSTALLATION
Connect Tie Trunks
A 2:1 connectorized splitter cable, WP90929, L3, is required to connect the
700A Jack to the cabinet for tie trunks.
1.
2.
3.
4.
5.
6.
Install secondary protectors (see Table 2-B).
Using the cable label sheets provided (Figure 2-7), label the back of
the hood of each of the connectors (1 and 2) on the two legs of the
splitter cable.Use an appropriate cabinet and slot number label
(CAB 1 SLOT8, for example).
On connector O, install labels that correspond to those used on...

INSTALLATION
Install DS1
DS1 signaling allows a digital connection between the System 25 and other
PBXs, Central Offices, Toll Offices, off premise stations, and data end points
such as host computers. The TN767 emulates ground start, Ioopstart, tie and
DID Trunks in addition to off premises stations. The ZTN131 circuit pack
provides the required digital synchronization.The TN748 circuit pack will provide
the Touch Tone registers.
The term synchronization refers to an arrangement where by digital...

INSTALLATION
Figure 2-19.Direct Connection (Side by Side)
NOTE: FOR DISTANCES OVER 50 FEET (15.2 M)
USE C6E CONNECTOR CABLE(S) BETWEEN
H600 307,G2 CONNECTOR CABLE AND DS1
TRUNK CIRCUIT PACK.
Figure 2-20.Direction Connection (Side by Side)
Connections Between 1311 and 4310 Feet
For distances between 1311 and 4310 feet, CSUs equipped with Office repeaters
must be used to regenerate the DS1 signal. See “Install CSU” section of this
manual for the installation instructions for the CSU. Figure 2-21 shows a...

Figure 2-21.DS1 Connections—1311 to 4310 Feet
DS1 Connections—4311 Feet or More
For distances of more than 4311 feet, T1 line repeaters are required in
addition to the CSUs. See the “Install CSU” section of this manual for
installing the CSU.Figure 2-22 showsa functional diagram of this
connection. If the connection is being made between the S25 and a DEFINITY
G1 or G2, System 75, or System 85, refer to the System 85 Installation
Manual (555-1 03-1 04) or the DEFINITY G1 Wiring Guide (555-204-111) or...

INSTALLATION
Off Premises Metallic (Cable) Connections
The connection between the System 25 and another DS1 interface is in most
cases a T1 line with repeaters.The proper lightning protection must be
provided (as shown in Table 2-B). Figure 2-23 shows a diagram of the off
premise cabling.
See the “install CSU” section of this manual for the
installation instructions for the CSU.
*DSX-1 REFERS TO A PHYSICAL CROSS-CONNECT FOR DS1 SIGNALS
Figure 2-23.DS1 Connections—Off Premise Cabling
Off Premises Non...