PRACTICE553 -2201-193
Typical
ISDLC
Cabling and Cross-Connections
(c)
(d)
(e)
(f)
Converts the Meridian SL-1 bit interleaved data format to
DS-30X+
format and vice versa.
4-
Converts Meridian SL-1 SSD (signaling) messages to TCM format
and vice versa.
Synchronizes the digital telephones and their data options
to-the
Meridian SL-1.
Provides buffering of messages to compensate for different
signaling rates
1.10 The ISDLC consists of the functional blocks shown in Fig. 1-2.
Each block incorporates the following main functions:
(al
TCM Loop interface.
*
Couples 8 identical TCM loops from the Digital Line Interface
(DLIC)
functional block of the ISDLC to the Digital Set
Interface
(DSIC)
functional block located in
each
digitial
telephone in both the transmit and receive directions.
l Provides i-30
V
battery feed to each digital telephone through a
voltage regulator, configured as a 60
mA
constant current
source.
(b)
Digital Line Interface
(DLIC).
The DLIC provides the
communication link between 8 digital telephones (including their
associated Data Options) and the Meridian SL-1 peripheral bus.
The DLIC performs the following functions:
Page l-3
s.
: