Lucent DDM-2000 OC-3 User And Service Manual page 202

363-206-285
Issue 2, February 2000
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Use the rtrv-fecom/set-fecom command to verify/set
Network Side/User Side parameters at each end of optical span
being established.
3.
NOTE:
If line timing mode is specified or external timing mode is
specified but the timing reference was not available at shelf
turnup, the TGS/TG3 option switches are probably set for
free running . Before the end-to-end system is established,
the specified timing mode must be set on the TGS/TG3
circuit packs.
NOTE:
If the option switch setting is changed, an update must be
done by momentarily depressing the UPD/INIT button on the
SYSCTL after the TGS/TG3 circuit packs are reinstalled.
NOTE:
If external timing is selected and the NE ACTY LED remains
lighted after the TGS/TG3 circuit pack is reinserted, use the
CIT and the rtrv-sync: command to check the
operational mode of the system. If the mode is Holdover
instead of External, check that the incoming timing
references are connected. Also check Mode Switching
(revertive or nonrevertive) and the external DS1 Line
Code/Format switch settings.
Set timing mode on TGS/TG3 circuit packs to the timing mode
specified in work order or office records.
DDM-2000 OC-3 M
System Turnup:
ULTIPLEXER
NTP-022
Page 2 of 8
DLP-513