Karel DS200, Technical Reference And Installation Manual

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XVI. DISTRIBUTION FRAME AND
ARRANGEMENT OF CABLES TO BE USED
XVI.1. DISTRIBUTION FRAME
One of the most important steps for setting up an exchange is the arrangement step
pertaining to cabling infrastructure, which includes preparing distribution frame, cable guides
and cable groups.
Preparing one group of internal distribution frame and two groups of external distribution
frame is essential to installation of the DS200 series exchanges.
Arrangements pertaining to external distribution frames, external cable groups and cable
guides can be done before or after installation of the exchange.
Regarding the cabinet type DS200 exchanges, internal distribution frame must be mounted
directly in the distribution frame field that is on the back of the cabinet. On the other hand,
regarding the wall type DS200, DS200S or DS200M exchanges, the internal distribution
frame must be mounted on the wall next to the exchange, within a distance that is accessible
by exchange cables.
These first-step panels are to be the internal distribution frame of the exchange and so
protection components must definitely not be installed in those panels. In this regard,
disconnection modules must be employed in that panel.
On the other hand, the external distribution frame must be at least 20 meters away from the
internal distribution frame (If that distance cannot be provided physically, then the jumpers to
be used in between must be at least 20 meters long.) It is extremely important to arrange the
external distribution frames as two levels, taking into consideration the adverse
environmental effects.
In this regard, disconnection modules should be employed in external distribution frames.
Regarding those panels, installing Fuse-10 protection modules to the one closer to the
external medium, and installing gas discharge tubes, which have been placed in protection
magazines, in the one that is close to the internal distribution frame provide effective
protection.
Paying attention to some points while attaching the cables to the internal distribution frame,
which come from the exchange would be essential regarding facilitation of work both during
the installation and during later maintenance.
The cables with 16 and 8 pairs on the exchange side have standard arrangement and color.
There are 4 groups with 4 pairs in the cable with 16 pairs, and there are 2 groups with 4 pairs
in the cable with 8 pairs. It is recommended that 8 pairs be attached to a patch panel that has
a capacity for 10 pairs while connecting those cables to patch panels, that is, the last two
pairs be left vacant. The reason is not to split the cables that come in groups of four pairs,
thus facilitating mounting. The color code and signals pertaining to the cables that come with
the exchange have been stated in section V.3 in detail.