363-206-285 Detailed Level Procedure: DLP-523
Issue 2, February 2000 Page 4 of 30
DDM-2000 OC-3 MULTIPLEXER
BBF2 TGS
8.
!
CAUTION:
BBF2 TGS
and
BBF2B TGS
timing mode switch settings are not set the
same. Check switch settings carefully.
NOTE:
The timing mode of all nodes should be checked before the system is
placed in service. Improper timing modes may cause the system to act
unpredictably or cause a service interruption (for example, if all nodes are
set to line timed mode).
NOTE:
The BBF2 TGS timing mode may be provisioned as
Free Running
,
DS1
External
,or
Line Timed
. In free-running mode, the BBF2 TGS gets timing
from an oscillator on the BBF2 TGS. In external timing, the BBF2 TGS
gets timing from an external DS1 reference input. In line timing, the BBF2
TGS gets timing from an OLIU from a reference clock recovered from the
received OC-3 line rate signal.
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