Karel DS200, Техническое справочное и монтажное руководство

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DS Series PBX Technical Reference And Installation Guide
67
VI.3.A.5. THE DCC 8E1 INTERFACE CARD
Definition:
The DCC 8E1 Interface card has 8 E1 ports as its name already indicates, and it can be
installed in the 14 general-purpose slots within DCC. 8E1 cards have been numbered
starting with the rightmost slot in the DCC Block. The rightmost slot (leftside slot of the DCC
Power In Card) has been reserved for the 8E1 card number 0, and the leftmost one for the
8E1 card number 13 in the DCC block.
Technical Information:
The DCC 8E1 Interface cards communicate with the DCC Utility card over the HDLC
protocol.
The DCC 8E1 Interface card receives the 48 VDC feed voltage from the backplane and
generates the 3.3 VDC signal it needs. By this way, the power signals within the DCC block
have been isolated from each other, so that defective units are prevented from adversely
affecting other units.
The DCC 8E1 Interface card has embedded self-test feature. The DCC Utility card is capable
of applying BERT test to the E1 channels within DCC. By this way, any problem that might
occur in the future is easily detected in advance and necessary precautions are taken before
system performance deteriorates.
The DCC E1 lines constitute the main frame for voice transmission system of the exchange.
Those lines can be used to provide transmission paths for speech channels between DCC
and TW200 towers.
The E1 lines connected to TW200 towers are called “switching E1 lines ”.
The E1 lines extending to TW200 towers are connected to the Utility 4E1 cards that are in
the towers. On doing that, it is obligatory to connect at least one E1 line to each tower. Each
E1 line provides 31 speech channels to a tower. It is sufficient to increase number of E1
connections to towers in order to increase number of speech channels. In case where
several E1 channels are connected to the TW200 4E1 card, distribution of speech channels
to those E1 lines is arranged by the system automatically.