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There are 14 PCM channels for each rack (7 PCMs for receiving, 7 PCMs for transmitting -
32 frames for each PCM.) Hence, each general-purpose slot uses 16 PCM frame pairs of a
PCM channel pair. These 16 PCM frame pairs have been connected to each slot on the
backplane via special paths, so that a static structure has been formed.
Since there are 16 PCM frame pairs in each slot, each extension or line module can use at
most 16 PCM frame pairs in a single slot. As explained in the related sections later in the
guide, every other module, except the E1-based modules such as EX200 (1E1/0), make use
of 16 PCM frame pairs; therefore, they can be installed in any vacant slot. (Note that an
extension card should be installed in the first slot, because the first number of the first
expansion slot has been assigned to the operator, through which programming is to be
done.)
*
IN CASE IT IS REQUIRED, THE EX200 EXPANSION MODULES CAN BE
REMOVED FROM THE SYSTEM THROUGH PROGRAMMING WHILE THE
SYSTEM IS STILL RUNNING.
Dimensions of DS200 EX200B are 20 cm. x 22.5 cm., and it weighs 0.3 kg.
Details about all EX200 Extension / Line Module types are as follows.
VII.3.A. EX200 (0/16R) ANALOG EXTENSION
MODULE
In addition to the common circuits explained above, there are 16 analog extension circuits
(SLIC) on the EX200B (0/16R) card, which are identical.
Each SLIC includes a CODEC for analog to digital and digital to analog conversions and a
transformer, as well as the standard circuits such as – 48 VDC feed, handset status
detection, 2-4 / 4-2 wire conversion.
Those extensions possess some extra features in addition to the standard extension
features:
•
12 or 16 KHz pulse price signal generation
•
Polarity reversal generation
•
Caller ID generation
•
Automatic
test
The connections to the EX200B (0/16R) card are made over the CON5 line connection card.
VII.3.B. EX200 (0/16C) ANALOG EXTENSION
MODULE
In addition to the common circuits explained above, there are 16 identical analog extension
circuits (SLIC) on the EX200B (0/16C) card, which are capable of carrying Caller ID
information.
Summary of Contents for DS200
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