Nortel Networks OPTera Metro 3500 - Manual (Page 232)

3-4 Hardware feature descriptions
OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
OPTera Metro 3500 Shelf and the OPTera Metro 3500 Universal Shelf
(NTN476AA, DA, AH)
Release 12 supports the OPTera Metro 3500 Shelves (NTN476DA,
NTN476AA) and the OPTera Metro 3500 Universal Shelf (NTN476AH). Both
the OPTera Metro 3500 Shelf and the OPTera Metro 3500 Universal Shelf
have 17 slots. Tributary I/O connections are located at the top of the shelf for
field-installable I/O modules.
The OPTera Metro 3500 Universal Shelf is rated at 20 A from 0°C to +50°C
and is rated at 12.5 A from -40°C to +65°C. See
Table 4-1 on page 4-1 (in
Part 2 of this guide) for power requirements.
The Universal shelf supports both front rear-facing I/Os. Both the OPTera
Metro 3500 Shelf and the OPTera Metro 3500 Universal Shelf are rated to
operate in a controlled environment central office within the temperature range
of 0
° C to 50 ° C (32 ° F to 122 ° F). However, the OPTera Metro 3500 Universal
Shelf is rated to operate under extended temperature conditions as well, in the
range of -40
° C to +65 ° C (-40 ° F to +149 ° F).
Note: The OPTera Metro 3500 Universal Shelf (NTN476AH) can operate
in the extended temperature range only if all its accessory components are
also rated for the extended temperature range. See
Table 3-3 on page 3-6 .
The Universal shelf has various enhancements to facilitate easy installation of
I/O modules and temperature control. All the circuit packs are interchangeable
between shelves, however, some restrictions apply, see
Table 3-3 on page 3-6
for details.
On all types of shelves, slot 1 contains three separate subslots: 1a, 1b, and 1c.
Slot 1a is for the left interface (LIF) and slots 1b and 1c are for the power
modules. The left OAM (LOAM) attaches to the LIF from the left side of the
shelf. The system retrieves inventory information for the LIF, the LOAM, and
the power modules through slot 1. You must insert the LIF to retrieve inventory
information for these circuit packs.
Shelves equipped with VTX-48 or VTX-48e circuit packs
On all types of shelves, slots 11 through 14 are double-width slots for the
OC-48 circuit packs and the VTX-48 or VTX-48e circuit packs. Slots 11 and
12 are high-speed interface slots for the OC-48 or OC-12 optical interface
circuit packs. The VTX-48e circuit pack supports the OC-12 line rate for the
optics in slots 11 and 12 on any shelf. Slots 13 and 14 are for the VTX-48
modules, which provide the VT and STS cross-connect functions for all
service slots. The VTX-48 and VTX-48e circuit packs interface as STS-48
with the optical interface slots 11 and 12 and interface as STS-3 and STS-12
with the slots 3 through 10.