Cable Access Panels And Emergency Transfer Units; 400A Apparatus Mounting - AT&T 75 Wiring Manual

This section of the document only covers using the cable access panels (CAPs) for the
trunk/auxiliary field (Figure 2-13). If 110-type or 66-type hardware is used as the
trunk/auxiliary field, refer to Section 3 or 4 of this manual.

Cable Access Panels and Emergency Transfer Units

Figure 2-14 is a functional diagram of the cable access panel (CAP). As shown in Figure 2-
14, 25-pair connectors on each side of the CAP are wired to 110-type terminals located in the
center of the panel. Five connectors on each side of the CAP provide a pass-through
connection for five 25-pair cables. An additional connector is provided on the left side for
the Emergency Transfer feature.
The connectors on the left side of the panel are labeled DISTRIBUTION CABLES: the cables
on the right side are labeled CABINET CABLES. Factory-installed straps on the 110-type
terminals connect the distribution side connectors to the cabinet side connectors.
CAPs are available with or without a power failure transfer unit mounted inside at the top
of the panel. They are coded as apparatus mountings and are available as described below.

400A Apparatus Mounting

The 400A apparatus mounting is not equipped with an emergency transfer unit. It is used
when the customer does not require the Emergency Transfer feature. It can also be used
when more than one CAP is required and/or the emergency transfer units are mounted
outside the CAP.
400B Apparatus Mounting
The 400B apparatus mountings equipped with a Z1A Emergency Transfer Unit. The Z1A
unit provides emergency transfer connections for six analog (only) voice terminals to six
trunks. If the central office trunks require ground start, a ground start switch must be
installed on each voice terminal used for emergency transfer service.
400C Apparatus Mounting
The 400C apparatus mounting is equipped with a 574-5 Power Transfer Unit. The 574-5 unit
provides emergency transfer connections for five analog (only) voice terminals to five trunks.
This unit provides automatic ground start.
CABLE ACCESS PANEL ORDERING INFORMATION
Description
400A Apparatus Mounting
400B Apparatus Mounting
400C Apparatus Mounting
Z1A Emergency Transfer Unit
574-5 Power Transfer Unit
(With Automatic Ground Start)
Apparatus Mounting Door
Z100-TYPE HARDWARE
Comcode
103 969 663
103 969 671
103 969 689
103 961 363
403 890 940
844 176 164
2-17