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363-206-285
Issue 2, February 2000
Table B – BBF2 TGS Synchronization Provisioning Topologies (Contd)
NE 1
Line Timing
Refer to Table C and Figure 1 and set the timing mode as required for the new
BBF2 TGS circuit pack(s).
Table C – BBF2 TGS Timing Mode Switch Setting
Timing Mode
Free Running
DS1 External, MULT Mode
Line Timed
*
Invalid
*
If an invalid setting is selected, FAULT LED is lighted and
an unexpected CP type or unexpected CP
switches alarm is generated.
NE 2
Line Timing
Switch S1 Settings
S1-3
ON
OFF
ON
OFF
Figure 1 – BBF2 TGS Option Switch
DDM-2000 OC-3 M
Detailed Level Procedure:
Application Comments
Caution! This topology creates a timing loop and it
is not. supported. The NE with access to an
external timing reference traceable to a PRS, if
available, should be provisioned for External - Mult.
If the reference available is an optical reference
provision to Line Timing with the proper source
using the set-sync command. If automatic
synchronization reconfiguration is supported and
enabled in a system, both NEs will attempt to
switch to another line timing source, if available, to
prevent a timing loop.
S1-4
ON
ON
OFF
OFF
ULTIPLEXER
DLP-523
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