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NEAX2000 IVS
2
ISDN System Manual
Page 12 ND-70919 (E), Issue 1.0
CHAPTER 1 GENERAL INFORMATION
System Outline
PLO
The Phase Locked Oscillator (PLO) equipped on the MP card synchronizes the system to an
ISDN clock.
The PLO generates the clock signals according to the source clocks received from network. The
source clock signals are extracted at DTI/BRT/PRT cards and supplied to the PLO. Two clock
routes are available; one is Route 0 that receives clock signals from DTI0/BRT0/PRT0, and the
other is a standby Route 1 (DTI1/BRT1/PRT1) that receives clock signals when no clock signals
appear on Route 0. When no clock signals come from either Route 0 or Route 1, the PLO keeps
generating the clock signals at the frequency of the last source clock. The PLO can receive
different frequencies of source clocks from Route 0 and Route 1.
Figure 1-6 shows an example of clock supply route.
Figure 1-6 Clock Supply Route
PBX
TDSW
DTI1/BRT1
PLO
ISDN
: CLOCK SIGNAL SUPPLY ROUTE 0
: CLOCK SIGNAL SUPPLY ROUTE 1
NOTE: DTI0/BRT0/PRT0 and DTI1/BRT1/PRT1 must be mounted in PIM0.
/PRT1
DTI0/BRT0
/PRT0
NOTE