NTP-024
: Circuit Order 363-206-305
Page 6 of 12 Issue 3, June 2000
DDM-2000 F
IBER
R
EACH
W
IDEBAND
S
HELF
DO ITEMS BELOW IN ORDER LISTED. . . . .FOR DETAILS, GO TO
8.
!
WARNING:
Unterminated optical connectors may emit invisible laser
radiation. Eye damage may occur if beam is viewed directly
or with improper optical instruments. Avoid direct exposure
to the beam.
!
CAUTION:
An automatic protection switch service hit may occur when
the correct optical fibers are cut. Cutting the wrong fiber
lines will cause a service interruption.
At the point where the new DDM-2000 shelf will be added, use
local procedures to cut the two fiber lines connecting existing
shelves and condition the fiber for connection to the new shelf.
9.
NOTE:
Cutting the main sync source will cause the line-timed node
to go into
holdover
.
Verify that only minor nsa OC-3/OC-12 LOS and nsa inc.
VT/STS1 AIS alarms are present at each end of the fiber cut.
10.
NOTE:
If line timing mode is specified or external timing mode is
specified but the timing reference was not available at the
OC-3/OC-12 shelf turnup, the
TGS/TG3
option switches are
probably set for
free running
. Before this configuration 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.
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