Nortel Passport 7400, Hardware Installation, Maintenance, And Troubleshooting, Page: 289 / 438

Chapter 37 Hardware procedures 289
Passport 7400 Hardware Installation, Maintenance, and Upgrade 5.2S1
Installing multiple MSA32 sparing panels (RJ45)
Install multiple MSA32 sparing panels for a 1-for-N sparing configuration.
Prerequisites
• The one-for-n (1:n) configurations of 32-port multi-service access
(MSA32) sparing panels require one panel for each FP you want to spare.
For example, a 1:4 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 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 sparing panels with RJ45 connectors
(NTJS95) in a 1:n sparing configuration, space is required between the
panels to accommodate inter-panel flexi-cables.
• An MSA32 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 RJ45 sparing panels are different
than other MSA32 panels by having a third D-sub connector. See the
figure “Inter-panel flexi-cable for MSA32 sparing panels with RJ45
connectors” (page 291).
• 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 sparing panel from its FP only through
the connections labelled P3 at both ends. For the sparing panel to operate,
the connectors at P3 must be cabled.
Procedure steps
1 Install the top MSA32 RJ45 sparing panel according to the procedure
“Installing a 19” rack-mounted termination panel” (page 205)
.
2 On each inter-panel flexi-cable (NTJS99), ensure that the D-sub sliding
latches on each end are in the disengaged position. If a latch is engaged,
the cable connector cannot be fastened to the panel connector. See the
figure “Inter-panel flexi-cable for MSA32 sparing panels with RJ45
connectors” (page 291).