NEC NEAX 2000IVS2 Installation Manual page 273

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 PLO
0 of MP card via the Back Wiring Board, and if the clock signals are failed, the clock
supply route takes over to PLO1 automatically. Set SW11-2 and SW11-3 as follows.
BRT0
CONDITIONS
SW
11-2
When one BRT
ON
is provided.
When more
than one BRT ON
is provided.
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.
2
NEAX2000 IVS Installation Procedure Manual
ND-70928 (E), Issue 1.0
CHAPTER 3 LAMP INDICATIONS AND SWITCH SETTINGS
BRT1 BRT2
SW SW SW SW
11-3 11-2 11-3 11-2
ON
ON ON OFF OFF ON
---- BRT11
SW SW SW
----
11-3 11-2 11-3
---- OFF ON
PN-2BRTC (BRT)
REMARKS
MP card will receive the clock
signal from No.0 circuit of
BRT0 at its PLO0 input.
Should a clock failure occure
with No.0 circuit, MP card will
switch to No. 1 circuit of
BRT0.
MP card will receive the clock
signal from BRT0 at its PLO0
input, under normal condi-
tions.
Should a clock failure occure
with both No.0 and No.1 cir-
cuits of BRT0, MP card will
switch to the PLO1 input
which gets clock from BRT1.
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