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CHAPTER 4 CIRCUIT CARD INFORMATION
PN-2BRTC (BRT)
NEAX2000 IVS
2
ISDN System Manual
ND-70919 (E), Issue 1.0
Page 155
NOTE 3: The system can supply clock signals from two clock supply routes.
In normal condition, the system synchronizes to the clock signals supplied on the PLO0
of MP card via the Back Wiring Board, and if the clock signals fail, the clock supply
route takes over to PLO1 automatically. Set SW11-2 and SW11-3 as follows:
NOTE 4: When the system is a clock source office, set the SW11-2 and SW11-3 on all the BRT
cards mounted in PIM0 to OFF.
NOTE 5: Mount the BRT card which receives a source clock signals into PIM0.
CONDITIONS
BRT0 BRT1 BRT2 ---- BRT11
REMARKS
SW
11-2
SW
11-3
SW
11-2
SW
11-3
SW
11-2
SW
11-3
----
SW
11-2
SW
11-3
When one BRT
is provided.
ON ON
MP card will receive the clock
signal from No.0 circuit of
BRT0 at its PLO0 input.
If a clock failure occurs with
No. 0 circuit, MP card
switches to No. 1 circuit of
BRT0.
When more
than one BRT
is provided.
ON ON ON OFF OFF ON ---- OFF ON
MP card will receive the clock
signal from BRT0 at its PLO0
input, under normal condi-
tions.
If a clock failure occurs with
both No. 0 and No. 1 circuits
of BRT0, MP card switches to
the PLO1 input which gets
clock from BRT1.