GDK-100
DIGITAL KEY TELEPHONE SYSTEM
128
3.5.7.5
Clock Control Cable wiring- Multi ISDN board installation
GDK-100 system allows Multi-ISDN boards to be installed. When Multi-ISDN board installation, clock
control cable should be connected according to the priority of the cards. Then, in case that the ISDN line of
the board with the higher priority is in the state of Loss of signal or clock failed, the synchronized clock for
system will be supplied from next daisy chained ISDN board. Every ISDN card in TE mode generates the
reference clock synchronized with ISDN line and transmits the clock to PLLU on MPB according to the clock
control signal.
High (1) state
Low (0) state
IN
Enable the reference clock circuit
Disable the reference clock out circuit
OUT
Enable next clock circuit
Disable next clock circuit
Figure 3.5.7.5.a
Example of multi-ISDN board installation when PRIB is the highest priority.
MPB
PRIB
(TE mode)
BRIB
STIB
(T interface(s))
PLLU
Back Plane (Basic Mother Board)
OUT
IN
Priority
of Boards
< <
OUT
IN
OUT
IN
BRI Line
TE
S
T
PRI Line
1
Note:
1. Clock control cables supplied by LGIC should be connected between ISDN boards according to
the priority of them when multi-ISDN board installation.
2. When PRIB is set to master (NT) mode, the clock cable connected with PRIB is not required.
Содержание GDK-100
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