Ed-1E434, Group 84 Coaxial Cabling - AT&T System 85 Installation And Test

ED -1E434, Group 84 Coaxial Cabling
Connect the ED-1E434, Group 84 intercabinet coaxial cable(s) (Figure 36) from the common
control backplane(s) to the RMI carrier backplane(s). Figures 37 illustrates the connections
for an all unduplicated system. Figure 38 illustrates the connections for a typical all
duplicated system, while Figure 39 shows the connections for a typical system with
duplicated common control and unduplicated module control. Route the cable between the
cabinets through the duct work (use the shielded intercabinet duct for flat cables). The B
and D legs are not used in an all unduplicated or a duplicated common control and
unduplicated module control system and should be coiled and stored in the cable duct (if
space permits).
Use the Customer System Document (CSD) and Tables Q, R, and S to determine the
backplane pin locations used at the common control and the backplane pin locations used at
the RMI carrier. These tables should also be used to determine the legs that are used at the
RMI carrier. This association can be determined by looking up the remote module number to
find the appropriate common control backplane connector(s) and the leg that is used for the
RMI carrier.
The first column in Tables Q, R, and S is the remote module number. This is not the number
the module is assigned within the total system, but the number assigned to the remote
module. The first remote module may be the sixth module within the system. For example,
if your remote module being installed is the fourth in the system, then for an all
unduplicated system a Group 84 cable will run from E8 on the common control backplane to
B18 on the RMI carrier backplane using leg C. However, for an all duplicated system, the
Group 84 cable will run from E8 on both common control backplanes to B06, B07, B22,
and B23 on the RMI carrier (00) backplane using legs C and D off of each cable. For a
duplicated common control and unduplicated module control system, the Group 84 cable will
run from E08 on both common controls. Leg C will connect to B06 of the RMI carrier with
leg C of the other common control running to B22 on the same RMI carrier. Leg A of both
cables will have been used previously on the third remote module. Repeat this process for
each central module control that is being linked to a remote module.
A cable Group 89 can be used to extend each leg of the Group 84 cable. The combined length
of Groups 84 and 89 must be a maximum of 200 feet.
Note: There may be unused legs for a Group 84 cable if connections are not needed for
a succeeding module to the RMI carrier.
An existing Group 84 cable can be used if its unused legs are not dead -dressed or cut off. If
existing cable must be replaced, the original connections must be replaced.
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