Aria-130 Digital Key Telephone System
Issue: 1.2
Installation Manual
120
But terminating resistors are not introduced on GDK-100 BRIB issue 2 and GDK-100 STIB issue 1, which
versions are officially production stopped. So the external terminating unit should be required to terminate
them if GDK-100 BRIB is issue 2 or earlier, and GDK-100 STIB is issue 1. The external terminating unit
can be locally got, otherwise 2923NP1656, which is the terminating unit provided by LGE, can be used.
Note: R is 100 ohm terminating resistors.
Figure 3.5.17.b Terminating method of BRIB/STIB without switchable terminating resistors
3.5.7.5 Clock Control Cable wiring- Multi ISDN board installation
ARIA-130 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
Table 3.5.7 clock control cable on ISDN board
GDK-100 BRIB
GDK-100 STIB
RJ45 type jack
TX+
TX-
RX+
RX-
3
6
4
5
RX+
RX-
TX+
TX-
3
6
4
5
OR
T interface
: BRIB and
STIB (T)
S interface
: STIB (S)
From/To
BRI Line
From/To
ISDN Terminal
R
R
R
R
External terminating Unit
