Installing Multiple Msa32, Msa8 Sparing Panels (Rj-45) - Nortel Multiservice Switch 7400 Installation & Maintenance

Installing multiple MSA32, MSA8 sparing panels (RJ-45)

Install multiple MSA32 or MSA8 sparing panels for a one-for-n sparing
configuration.
Prerequisites
• The one-for-n (formerly 1:n) configurations of 32-port multi-service access
(MSA32) and 8-port multi-service access (MSA8) sparing panels require
one panel for each FP you want to spare. For example, a one-for-four
configuration requires four sparing panels installed on the same face of a
mounting apparatus, and connected in series through inter-panel flexi-
cables. This modular design of MSA32 and MSA8 sparing panels means
any one of the sparing panels in a series can be replaced without
disrupting traffic on the FPs attached to the other panels in the sparing
configuration.
• When using two or more MSA32 or MSA8 sparing panels with RJ-45
connectors (NTJS95) in a one-for-n sparing configuration, space is
required between the panels to accommodate inter-panel flexi-cables.
• An MSA32 and MSA8 inter-panel connection cable is a flexi-cable, a
ribbon cable that is equivalent to a flexible printed circuit board. Its product
code is NTJS99. The flexi-cables for MSA32 and MSA8 RJ-45 sparing
panels are different than other MSA32 and MSA8 panels by having a third
D-sub connector. See the figure Inter-panel flexi-cable for MSA32 and
MSA8 sparing panels with RJ-45 connectors (page 294). Also refer to the
figures Cable connections of MSA32 sparing panels with RJ-45
connectors (page 295), Cable connections of MSA8 sparing panels with
RJ-45 connectors (page 296), and Bottom flexi-cable connections of
MSA32 and MSA8 sparing panels with RJ-45 connectors (page 297).
• Since the flexi-cables are connected to the bottom of each sparing panel
down to the Main A (bottom) one, you must install the inter-panel flexi-
cables immediately after each panel is installed and before the next one in
the series is installed.
• Power is supplied to an MSA32 or MSA8 sparing panel from its FPs. The
2-slot version of a DS1 or E1 MSA FP provides the power through the
connections labelled P3, and only through this connection. For the sparing
panel to operate with a 2-slot FP, the connectors at P3 must be cabled at
both ends even if the port will not be configured in software. The 1-slot
version of the DS1 or E1 MSA32 FP provides the power through the
connections labelled P0. For the sparing panel to operate with a 1-slot FP,
the connectors at P0 must be cabled at both ends even if the port will not
be configured in software.
• On the MSA8 FP, power to the sparing panel is provided from P1 into the
P3 sparing panel connection using an MSA8 single connector cable. For
the sparing panel to operate, the connector at P3 must be cabled at both
ends even if the port will not be configured in software.
Copyright © 2005, Nortel
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Hardware procedures
Nortel Multiservice Switch 7400
Hardware Installation, Maintenance, and Upgrade
NN10600-175 7.1S1 Standard
PCR7.1 and up October 2005
Nortel Confidential