Z100-TYPE HARDWARE
Cable Access Panel Requirements
The number of cable access panels (CAPs) required is based on the number of through
connections required at the CAP. Each CAP provides five 25-pair through connections, in
and out. The primary circuits that pass through the CAP are 1-pair central office trunk
circuits and 3-pair tie trunk circuits.
The trunk cables connect from the network interface through the sneak fuse panel and CAP
to the system cabinet. Concentrator cables are used between the CAP and the system
cabinet. The connections are described under the heading Installing Trunk Cables
Between Network Interface and System Cabinet in this manual.
Trunk Circuit Capacities
Because concentrator cables are installed between the CAP and the system cabinet, the
capacity for each pass-through connection is 24 one-pair trunks or 8 three-pair trunks.
Procedure:
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7.
Divide total number of 1-pair circuits by 24.
If there is a remainder, round up to the next highest number. Let this number
equal PR1.
Divide total number of 3-pair circuits by 8.
If there is a remainder, round up to the next highest number. Let this number
equal PR3.
Add PR1 and PR3. Let this number equal CR (total number of pass-through
connections for trunk circuits).
Determine the total number of pass-through connections (X) required for the
following auxiliary and miscellaneous circuits:
—
Analog voice terminals used for emergency transfer service and as normal
extensions. Divide total number provided by eight. If there is a remainder,
round up to the next highest number.
—
Digital out-of-building voice terminals. Divide total number provided by
eight. If there is a remainder, round up to the next highest number.
—
Analog out-of-building voice terminals. Divide total number provided by
24. If there is a remainder, round up to the next highest number.
—
Each 71A data mounting or 3270C data module that connects directly
through the CAP to a system circuit pack.
Add CR, X, and 1*. Divide this number by 5. If there is a remainder, round up to
the next highest number. This is the total number of CAPs required.
Selecting the Cable Access Panel
Once the number of CAPs required is known, a choice has to be made as to what
combination of the three available codes to order. This selection is based solely on the
emergency transfer requirements.
If ground start trunks are used for the emergency transfer stations, the 400C apparatus
mounting equipped with the 574-5 Power Transfer Unit is recommended. The 574-5 unit
* Auxiliary connection always required on initial CAP for control carrier outputs.
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