Control, Transmission, and Synchronization Interfaces
Issue 8.0 July 2002
5-35
Ring Applications Used to Distribute Timing 5
For ring applications (FT-2000 Release 7.2.0 and later software) that are used to
distribute timing, it is recommended that "Line Timed" mode of synchronization be
used. Through timing is also (still) acceptable. In ring applications used to
distribute timing signals to BITS clocks, there are two possible configurations.
Considering all available releases of FT-2000, then there are three fundamentally
different configurations. They are as follows:
â– One node provisioned externally timed; all other nodes provisioned
line timed. In this configuration (Figure 5-22), any one or all nodes that are
provisioned line timed can derive and distribute timing.
Figure 5-22. Example of a Ring Application with One Node Provisioned
Externally Timed and All Other Nodes Provisioned
Line Timed (With Two Timing Drops)
FT-2000
FT-2000
PBX or
Clock
DS3/EC-1/OC-3
DS3/EC-1/OC-3
DS3/EC-1/OC-3
BITS
Independent
Clock
P = TIMING IN PRI to TG3-1
S = TIMING IN SECY to TG3-2
1 = TIMING OUT 1 from TG3-1
2 = TIMING OUT 2 from TG3-2
2
1
SP
1
BITS
FT-2000
Externally Timed
Node A
Node C
Node D
IS-3/OC-12
IS-3/OC-12
DS3/EC-1/OC-3
IS-3/OC-12
IS-3/OC-12
Line Timed
Line Timed
FT-2000
Node B
Line Timed
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