363-206-295
Transmission and Synchronization Interfaces
Issue 1 December 1997 5-33
It is recommended that, where possible, the DS1 sources (switch, PBX, or other
equipment) be traceable to the same timing source used to time the DDM-2000
SONET network. Multiplexed DS1 reference transport is also consistent with
current planning and administration methods. Applications include passing
synchronization from the public switched network to a PBX-based private network
(Figure 5-12) and synchronizing an end-office remote switch to a larger office's
host switch.
Figure 5-12. Timing from Multiplexed DS1
DDM-2000
DS1
Customer
Network
RT
PBX
External Clock
Stratum 3 or
DDM-2000
Better
DS1
CO
DS1
DS1 Carrying Data
and Used as a
Timing Reference
OC-N
tpa 814268/01
TG
TG
May be a TG3 if the CO is a TG3.
*
*
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