Lucent Technologies PacketStar PSAX 4500, Руководство пользователя

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255-700-239 E-3
PacketStar
®
PSAX 4500 Multiservice Media Gateway User Guide , Issue 2 Release 8.0.0
Appendix E PSAX Modules
LIM 3–4 Module
LIM 3–4 Module
The LIM3–4 module provides three sets of BNC connectors for transmission
and reception of traffic (TX/RX). It also provides loss of signal indicators and
relays to control traffic flow. The LIM3–4 module is only installed in the rear
panel slots (
3–12 ) of the PSAX 4500 chassis on a one-for-one basis with the
working modules installed in the front panel slots ( 3–12 ). The relays on the
LIM3–4 module direct the traffic flow between the working modules and the
protection modules in normal operation and during a switchover.
The N:1 Protection feature supports the configuration of one or two protec-
tion groups for the PSAX 4500 system, with each group containing either
one-to-six or one-to-four working modules of the same type, one LIM3–4
module for each working module, and one protection module of the same
type for each group. The protection groups are set up as follows.
•
For group 1, up to six working modules are installed in slots 3 , 4 , 5 , 6 , 7 ,
and 8 , and the protection module is installed in slot 15 . A LIM3–4 module
is installed directly behind each working module.
• For group 2, up to four working modules are installed in slots
9
,
10
,
11
, and
12
, and the protection module is installed in slot
13
. A LIM3–4 module is
installed directly behind each working module.
Two types of protection schemes are supported for each protection group: N:1
and 1:1. In the N:1 scheme, one to six working modules are associated with
one protection module in group 1, and one to four working modules are
associated with one protection module in group 2. In the 1:1 scheme, only
one working module in a protection group is associated with one protection
module. Under normal conditions, the working module in a protection group
is in active mode, exchanging traffic, and the protection module is in standby
mode.
The N:1 Traffic Protection modules can also be used in a nonprotected config-
uration in which these modules can be installed in slots
1–12
as long as each
Protection module has a corresponding LIM3–4 module installed directly
behind the Protection module that the LIM3–4 module is serving. If any slots
23N25 DSP2F Voice Server (
DSP2F
)
23N26 DSP2E Voice Server (
DSP2E
)
23N27 DSP2C Voice Server (
DSP2C
)
23N28 Tones and Announcements Server (
TAS
)
23N29 DSP2D Voice Server (
DSP2D
)
23N41
Edge Router (
EDGE ROUTER
)
Table E-1. PacketStar PSAX Modules (Continued)
Model
NumberModule Title (Faceplate Label)