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DHS Installation
7. Station Cabling
Floor plans should be developed to aid in proper station cabling in a star (home run)
configuration from the KSU. The cables are run from the station locations to the STN
block at the MDF.
Both ends of each cable should be labeled with the station's circuit number. The circuit
number designates the station port position in the KSU.
When the system is initialized, the intercom numbers are assigned in order from Port- 1
(intercom number 10) to Port-24 (intercom number 33) as each Module is installed. Refer
to
Figure 2-19: Wiring Designations for 3 x 8
Running Cable
From the MDF location, run unshielded, 3-pair (6-conductor) twisted cable to all key
telephone locations and DTMF single-line telephone locations.
Follow these guidelines:
Install proper type cable for the application according to the National Electrical Code
and local building codes.
Avoid cable runs parallel to fluorescent light fixtures or AC lines not in conduit. If
these obstacles are unavoidable, run the cables across them at right angles.
Do not run station cables inside electrical conduit already occupied by AC wiring. (To
do so is a violation of the National Electrical Code).
Do not run station cables near equipment with electric motors or through strong
magnetic fields, such as those generated by large copy machines, arc welding
equipment, heavy motors, etc.
Do not place station cables where they can be stepped on or where they can be
rolled over by office furniture.
If using multi-pair (25-pair) cable runs to multiple station locations do not include AC
ringing single-line sets, AC-ringing auxiliary equipment, or CO lines in a cable being
used for key telephones. Key telephones should always be isolated in separate
dedicated cable runs.
Do not exceed the measurements for the station cable lengths (using 26AWG wire)
listed in
Use shielded cable if RFI/EFI is expected.
Table 2-6: Maximum Cable
It is recommended that a minimum of 3-pair cable and a minimum of 4-conductor modular
jacks be used for all station connections.
Modules.
Length.
2-39
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