Nortel Networks OPTera Metro 3500 - Manual (Page 318)

3-90 Hardware feature descriptions
OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
The maximum number of working DS3x12 / DS3x12e mappers that can be
inserted in a shelf is four.
See Table 3-3 on page 3-6 for operational temperature ranges.
Note 1: Mixing a DS3x12 mapper with a DS3x12e mapper as a protected
pair will result in the protected pair to behave as 2 DS3x12 circuit packs.
Additional path PMs and alarms supported with the DS3x12e are not
available when circuit packs mixed.
Note 2: If there is a 1-28 DS1 I/O module installed, and if slots 5 and 6 are
not equipped with DS1 mappers, you may not install DS3x12 or DS3x12e
circuit packs in slots 5 or 6 (there is not enough room for slot 5 or slot 6’s
BNC I/O modules).
Note 3: If there is a 29-56 DS1 I/O module installed, and if slots 7 and 8
are not equipped with DS1 mappers, you may not install DS3x12 or
DS3x12e circuit packs in slots 7 and 8 (there is not enough room for slot 7
or slot 8’s BNC I/O modules).
Note 4: If there is a 29-84 DS1 I/O module installed, and if slots 7 through
10 are not equipped with DS1 mappers, you may not install DS3x12 or
DS3x12e circuit packs in slots 7 through 10 (there is not enough room for
slot 7 through slot 10’s BNC I/O modules).
Alarm LED definitions
The following table provides a list of the DS3x12 / DS3x12e mapper LEDs.
See
Figure 3-28 on page 3-47 for the DS3x12 and DS3x12e mapper faceplate
layout showing the location of the LEDs.
DS3VTx12 mapper
(NTN435FA)
Each of the 12 ports of the DS3VTx12 mapper receives a channelized DS3
signal and demultiplexes it into 28 DS1s. The DS1s are mapped into VT1.5s
and carried off the circuit pack to the VTX-series circuit packs where they are
cross-connected into any of the supported transport or tributary circuit packs.
This mapper is fully bidirectional.
For more information about channelized DS3 service and the DS3VTx12
mapper, see
Channelized DS3 service (DS3VTx12 mapper) on page 2-44 .
LED Color Description
Status Red Circuit pack failure
Active Green DS3x12 equipment is active and at least one DS3
line facility is in service with at least one
cross-connect
LOS (1-12) Yellow Loss of signal on the port