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AC Power Line Surge Suppressor
The TII Model 428 Self-Restoring Powerline Surge Suppressor (PEC 8310-001, Comcode
402988950) protects against electrical surges, spikes, and transients that can cause damage to
the System 25 power supply. A pilot light indicates that full protection is present. The unit
plugs directly into a standard 120-volt 15-amp grounded outlet, providing a dual outlet to
protected equipment.
346 Modular Bulk Power Supply
The 346 Modular Bulk Power Supply (346 MBPS) is a cost effective and flexible alternative
to the KS-22911 power supply.
The 346 MBPS can be used where the wall outlet mounted
KS-22911 cannot be used (Canada) or where multiples units are required. The 346 MBPS
consists of the 346A Power Unit (346A PU) and the 346A1 Power Panel, that is the sole
method of mounting the power units.
Up to three 346A PUS can be mounted per power
panel. Each PU is capable of powering four terminals with adjuncts, for a total of twelve
terminals per full MBPS. The 346 MBPS is intended to be installed in a closet and should be
near the SIP. All connections are modular and are made with cords and adapters at the
858A Adapter of the SIP. Terminals and the Selector Console can be powered by the 346
MBPS. Refer to Figure 4-27 for a typical use of the MBPS.
Connectivity
System 25 requires four-pair building wiring that conforms to AT&T Premises Distribution
System (PDS) specifications.
Various cords, cables, adapters, and connecting blocks are used
to facilitate the connection of equipment and associated cable and wire.
Major points of connectivity include the following:
● The system cross-connect field located on a wall adjacent to the system cabinets.
The field provides mounting space for the Trunk Access Equipment (TAE), Station
Interconnect Panels (SIPS), and Emergency Transfer Units (ETUs).
Refer to Section 5,
“Environmental Requirements” for a typical System 25 layout
including cross-connect field and associated equipment layout.
●
25-pair connectors located on the rear of each system cabinet
●
Modular jacks located at each work station provide modular connections for
terminals and associated adjuncts and auxiliary equipment. These jacks are
connected by building wiring to the SIP. Several wiring options are described below.
Wiring Options: There are three basic PECs under which building (station) wiring is
ordered:
●
The 2772 (-JA1, JA2, or JC1) PECs cover new,
reuse and (new) plenum wiring,
respectively. These PECs apply on a per wire-run basis.
●
PEC 2771-JDX covers wiring on a time and materials.
●
PEC 2773-JDX covers wiring based on a PCS quote.
Consult the 2770-section of the Sales Manual for restrictions and requirements before
ordering.
Trunk Access Equipment (TAE)
The TAE (Figure 4-18) provides for the connection of communications facilities such as Tie,
Ground Start, Loop Start, and DID trunks, to the trunk ports of the system. Up to three
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