Specifications

X723-300151 7-2 Issue 2
A unique I.D. code for the card is contained in the status port information
which is used by the system controller in the 'Equipment map' to display
which type of card is fitted in each position.
Data channel cards, when set for DTE operation, can provide an 8kHz
clock signal derived from the data/clock input at the interface. This can be
selected by links or switches to drive the 8k1 or 8k2 signals for use as the
source of system synchronisation. Only one circuit in the multiplexer
must be set to provide each clock.
All channel cards have their channel interface connections on the upper
backplane connector. The connections are listed in the relevant channel
card manual. A Universal I/O Adapter DT280 is available to convert the
96 way DIN connector to a 50 way Amphenol female connector. This
adaptor provides additional screening and must be used where compliance
to EMC specifications is required. Converter cables to change the
Amphenol connector to a standard data interface for the type of card is
also available.
The maximum power required by any of the channel cards (not using the
backplane -48V supply) is 8W, however the power requirement for most of
the cards is considerably less than this. The maximum loading for each
card can be found in the relevant channel card manual.
A red LED provided on all data cards (one per circuit) gives a visual
indication that the circuit is in loop or that, in DTE mode, a timing slip is
occurring. On cards with more than one circuit the lower LED is for
circuit 1. Other LED functions are described in the manual for each card.
The relationship of input/output connections for all interface cards is
shown below.
RX
PCM
TX
MUX
INTERFACE
CARD
RX OUTPUT
CONTROL OUTPUT
eg. E or I LEAD
TX INPUT
CONTROL INPUT
eg. M or C LEAD