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DHS-E Installation
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
maximum one-way distances from the KSU.
Terminating Cables at Station Locations
At each station location terminate station cables on 4-conductor modular jack
assemblies. Although only one pair is required for key telephone operation, the second
pair is wired through to the ADP jack for a variety of applications at the desktop. For
exceptions to this, refer to
Cable Conductor
White/Blue
Blue/White
White/Orange
Orange/White
Do not mount the modular jack assemblies on the wall at this time; they will be wall
mounted later when the station instruments are installed.
7. Key Telephones Installation
Key telephones may be mounted with three different orientations: Low Profile Desk
Mount, High Profile Desk Mount or Wall Mounted. Packaged inside each key telephone
carton are the following components:
Key telephone
Key telephone handset
7-ft. line cord
4-in. line cord (for wall mounting)
12-ft. handset cord
Small base-wedge mount assembly
Large base-wedge mount assembly
Table
3-6. The ohm values are loop measurements; feet (meter) values are the
It is recommended that a minimum of 3-pair cable and a minimum of 4-conductor modular
jacks be used for all station connections.
Table
Table 3-13: Station Location Cable Terminations
Jack Wire Color
Since the digital station equipment is not polarity sensitive, reversing the digital telephone
pair has no affect on operation. The Station Interface circuits are current limited and are
not fused.
3-13.
Green
Telephone voice and
data XT lead
Red
Telephone voice and
data XR lead
Black
ADP Jack Tip lead
Yellow
ADP Jack Ring lead
Designation
3-25
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