NTP-008: Circuit Order 363-206-285
Page 2 of 6 Issue 2, February 2000
DDM-2000 OC-3 MULTIPLEXER
DO ITEMS BELOW IN ORDER LISTED. . . . . FOR DETAILS, GO TO
4.
NOTE:
Standard DS1 transmitter sources are designed to terminate
in a nominal 100-ohm impedance. This termination is usually
provided by the receiving equipment. When not connected to
receiving equipment (that is, idle or unterminated), DS1
transmitter equipment should terminate in a 100-ohm load.
When connecting through DSX equipment, this can be
accomplished with terminating plugs available from the DSX
manufacturer. Any alternative method may be used resulting
in 100-ohms across the tip and ring of the DS1 circuit output
while in an idle state. Failure to terminate DS1 outputs may
result in violation of FCC Part 15 emission requirements and
possibly interfere with other electronic equipment. Also, AIS
should be turned off (using the set-t1:address:ais=no
command) on any DS1 circuit that is not in service.
DLP-508Option and install required service DS1/DS1PM circuit packs.
5.
NOTE:
If DS1 protection is required and service DS1PM circuit
packs are installed, a DS1PM circuit pack must be installed
in the protection 8(P) slot.
DLP-508Install protection DS1/DS1PM circuit pack into slot 8P of group
being put into service, if required.
6. At the DS1 terminating end(s) use the set-t1 command to set
the characteristics of the DS1 ports.
7.
!
CAUTION:
No service DS1
LOW SPEED
slots should be left empty in
groups equipped with
MXRVO
and protection
DS1/DS1PM
circuit packs.
NOTE:
177A Retainer Cards are used to disconnect the
cross-connect wiring associated with unused service DS1
slot locations from the DDM-2000’s internal protection bus.
Install 177A Retainer Cards into all unequipped service DS1 slots
in groups equipped with MXRVO and protection DS1/DS1PM
circuit packs.
DLP-508
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