Platform Descriptions
3-50 Issue 8.0 July 2002
Low-Speed Shelf — System Controller Circuit Packs 3
The Low-Speed Shelf — System Controller (Figure 3-28) provides the following
circuit pack slots:
— LSINTFC1A-8B: Sixteen slots are provided for the following circuit
packs.
— LAA2/LAA2B DS3 Interface (DS3) (S4:4) circuit pack (service):
— LAA4 STS1 Electrical Interface (STS1E) circuit pack (service):
— LAA10/LAA10B OC3 Optical Interface — 1.3µm Standard
Performance
(OC3 [1.3 STD]) circuit pack (service and protection): For optional
1+1 nonrevertive protection, two OC3 (1.3 STD) circuit packs must
be placed in adjacent "A" and "B" LS INTFC slots (for example, LS
INTFC slots "2A" and "2B").
— LAA5IS-3OpticalInterface—TheIS-3circuitpackiscompatible
with Release 7.1.0 and later software. For intraoffice applications, it
is a cost effective alternative to the OC-3 Optical Interface. The IS-3
terminates one input signal, generates one output signal, and
supports the transport of both STS-3 and STS-3c formats. It
supports interconnection distances up to 2000-feet using multimode
fiber.
NOTE:
For both 1+1 nonrevertive protection applications and transport of
STS-3c, two IS-3 circuit packs must be placed in adjacent "A" and
"B" LS INTFC slots (for example, LS INTFC slots "2A" and "2B").
— T939A OC-12 Optical Interface 1.3µm Standard Performance circuit
pack (service and protection): The OC-12 circuit pack is compatible
with Release 7.1.0 and later software. It may be used for either
intraoffice or interoffice applications. The OC-12 terminates one
STS-12/STS-12c input signal and generates one STS-12/STS-12c
output signal.
The OC-12 is a "quad-size" circuit pack and thus requires four
adjacent low-speed slots as shown in Table 3-6.
Table 3-6. Permitted Slot Locations for the Quad Circuit Pack
OC-12 Quad Slot Locations Command Slot Extension Slots OC-12 Pack AID
1 1A-1B-2A-2B 1B 1A, 2A, 2B ls-1b
2 3A-3B-4A-4B 3B 3A, 4A, 4B ls-3b
3 5A-5B-6A-6B 5B 5A, 6A, 6B ls-5b
4 7A-7B-8A-8B 7B 7A, 8A, 8B ls-7b
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