DS Series PBX Technical Reference And Installation Guide
113
XI.1.C. MAIN DISTRIBUTION FRAME & PROTECTION
DEVICES:
The most important step in field inspection is to find out the distance between the main
distribution frame and the exchange, because lengths of jumper cables that are to be
employed between the main distribution frame and the exchange are determined entirely
according to the structure of the building where the installation takes place. While those
lengths are being determined, calculating distances based on bird’s-eye view causes serious
errors. Therefore, the actual lengths of the cable guides must be calculated with respect to
the topography of the building.
If there are separate distribution frames for different interface connections, then all of them
should be measured and the types of interfaces for which they are employed should be
determined.
Similar work should be done both for MDF and for DDF separately.
The fact that the power cables should extend through cable guides that are apart from those
running extension and line cables must definitely be considered during planning. The lengths
and widths of cable guides that would be necessary for running the power cables (220 VAC,
battery, ground, generator, regulator, etc. connections) are also supposed to be figured out, if
they are not already installed.
Following all that work, the following distances are supposed to be measured, if applicable:
The distance between the spot where the alarm panel will be mounted and the
exchange,
The distance between the exchange and the maintenance / programming computer,
The distance between the exchange and the external programming modem,
Regarding the Ethernet connections, the distance between the exchange and the
closest appropriate HUB or SWITCH.
The Distance Measurement Table below should be filled out legibly with the measured
values.
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