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DHS-E Installation
General Site Considerations
The first step of
equipment (KSUs, boards, etc.). When locating a mounting site for the KSUs, the
following points must be considered:
KSUs are designed for wall mounting and should not be mounted directly to a
masonry or plasterboard wall. It is recommended that a 1/2 in. plywood backboard
be firmly mounted to the wall, and the KSU and MDF be mounted to the backboard.
The location must have access to a dedicated 110 V AC (±10%), 60 Hz, single-phase
circuit with a circuit breaker or fuse rated at 15 amps. A 3-wire parallel blade
grounded outlet should be within approximately 6 feet of the lower left rear of the
KSU mounting.
The location must have access to a good earth ground, such as a metallic cold water
pipe without non-metallic joints. The ground source should be located as close as
possible to the system.
The system should be located in an area that is well ventilated with a recommended
temperature range of 68-78° F and a relative humidity range of 5-60%
(noncondensing).
The system should be located within 25 ft. of the telephone company's termination
point. Also, the location should be within the prescribed station loop lengths for all
keysets and terminals. If existing cabling is used, its location and conduits should be
considered. Station wiring should be in the building. Station ports are not designed
for installation outside of the building.
Protection from flooding, flammable materials, excessive dust and vibration.
The site should be away from radio transmitting equipment, arc-welding devices,
copying machines and other electrical equipment capable of generating electrical
interferences.
Operation of this equipment in a residential area is likely to cause interference. In
which case the user, at his own expense, is required to take any necessary measures
to correct the interference.
Necessary Tools and Supplies
To make installation easier, consult the following pages when preparing to install the
system.
Tools
The following tools are recommended to install your
needed for certain troubleshooting procedures.
Use unshielded, twisted multi-pair (three-pair minimum recommended) cable to run
from the MDF to all station instruments (key telephone and single-line DTMF
telephones). Digital key telephones only need one twisted pair to operate.
DHS-E
installation is to locate an acceptable site for the common
Use shielded cable if RFI/EFI is expected.
DHS-E
system. Others may be
3-15
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