Karel DS200, Техническое справочное и монтажное руководство

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DS Series PBX Technical Reference And Installation Guide
165
XV.3. CABLING OF EX200 MODULES:
After the expansion modules have been installed in the related slots in the rack, line or
extension connections are established by making use of the cable pairs at the free ends of
the CBL-8 or CBL-16 cables, which have properly been taken out of the rack.
CBL-8 or CBL-16 cables are not used with E1 based cards, which carry 2 Mbit, rather 120
Ohm shielded cables are supposed to be employed in such cases. CAT-5 STP cable can be
used for that purpose. Here, one of the most important points to pay attention to is that one
end of the cable shield must be attached to the ground of the DS200 series exchange,
whereas the other end must be attached to the ground of the other device (another exchange
or HDSL modem, etc.), which is connected to the exchange. This is essential regarding
protection of E1 transmission from noise, so that it would work in full performance.
*
REGARDING E1 CONNECTIONS, SHIELDED CABLES MUST BE
EMPLOYED AND THE GROUND LEVELS ARE SUPPOSED TO BE EQUALIZED
BY ATTACHING THE SHIELD BOTH TO THE EXCHANGE AND TO ANY OTHER
DEVICE THAT IS CONNECTED TO THE EXCHANGE!
*
IF THE DS200 SERIES EXCHANGE IS TO BE CONNECTED TO AN UPPER
LEVEL EXCHANGE OVER E1 LINES, THEN MAKE SURE THE EXTERNAL CLOCK
FEATURE IS ACTIVATED IN THAT CASE OVER THE E1 LINE!
The following tables present cabling information on module basis pertaining to the
connections that are present in exchanges of the DS200 series.