NTP-045: System Turnup 363-206-285
Page 2 of 8 Issue 2, February 2000
DDM-2000 OC-3 MULTIPLEXER
DO ITEMS BELOW IN ORDER LISTED. . . . . FOR DETAILS, GO TO
3. Determine the optical loss of each optical span from office records
or by making the required measurements.
4.
NOTE:
Side parameters of the set-fecom: command must be set
opposite at each end of the optical spans. For example, see
Figure 2.
Use the rtrv-fecom/set-fecom command to verify/set
Network Side/User Side parameters at each end of optical span
being established.
5.
!
CAUTION:
Stand-alone OC-3 shelves can be timed from an external
source, set as free-running, or line timed from
FUNCTION
UNITS C
OC-3 slot. Stand-alone OC-3 shelves cannot be
line timed from the
MAIN
slots. Therefore, if the OC-3 shelf is
to be line timed, the
set-sync:src=fn-c
must be used to
derive timing from the
FUNCTION UNITS C
) slot, if
equipped.
NOTE:
At the OC-3 shelf, 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 pushbutton
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.
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