Nortel Optical Multiservice Edge 6130 Planning Manual page 69

sources or lockouts), the OME6130 falls into holdover mode. In the holdover
mode, the internal clock operates at a fixed frequency according to the last
known frequency reference for a minimum of 24 hours followed by freerun
mode (internal stratum 3 [ST3]/G.813 Option 1 compliant 4.6ppm clock). See
Figure 6-2 on page 6-9
Refer to Viewing and management on page 6-12
Synchronization application in the Configuration main menu of the local
craft access terminal for the OME6130.
Figure 6-2
Flow of synchronization timing signals
OME6110 faceplate
Port Clock
Base chassis
(a) Internal timing
OME6110 faceplate
Port
Base chassis
(c) Line timing
Legend
Port
Service interface port
Internal clock generator
Clock
Synchronization timing
External synchronization reference
Traffic flow
example (a).
Port
Port
Planning Guide NT6Q92MA Rel 1.0 Iss 1 Standard September 2006
OAM&P description 6-9
for information about the
Stratum 3/G.813
Option 1 or better
OME6110 faceplate
Port Port
Base chassis
(b) External timing