IBM TotalStorage 2109 M12, Installation And Service Manual

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Perform these additional steps if you are installing a new 16–port card:
1. Verify that the power LED on the 16–port card is displaying a steady green light
(it might require a few seconds to turn on). If it does not turn on, ensure that the
16–port card has power and is firmly seated. The front of the 16–port card
should be flush with any adjacent 16–port cards or filler panels.
Note: The LED patterns can temporarily change during a POST and other
diagnostic tests.
2. Install SFPs and cables in the 16–port card, as required.
3. Group and route the cables as desired. See “Guidelines for managing cables”
for more information.
Attention: Do not route cables in front of the exhaust vent (located at the top
of the chassis on the port side).
Guidelines for managing cables
The following guidelines are for managing cables:
v
You can manage cables in a variety of ways. You can route them down through
the cable management tray or route them out either side of the chassis. You can
also manage them by using patch panels or cable channels on the sides of the
cabinet.
v To keep the LEDs visible and to prevent having to disconnect the cables when
removing neighboring cards, route fiber-optic cables and other cables directly
downwards, instead of across adjacent cards or in front of the power supplies.
v
Leave at least 1 m (3.28 ft) of slack for each fiber-optic cable, which:
– Provides room to remove and replace the 16–port card
– Allows for inadvertent movement of the cabinet
– Prevents the cables from being bent to less than the minimum bend radius
The minimum bend radius for a 50–micron cable is 3.05 cm (2 in.) under full
tensile load and 3.048 cm (1.2 in.) with no tensile load.
v Use the cable guides that are provided with the switch to group the cables by
trunking ports (groups of four neighboring ports). These guides help to keep
individual ports accessible by keeping the cables evenly spaced. They also help
to provide clearance when removing a neighboring card.
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SJ000642
Figure 35. Alignment guides in the card slots
Chapter 6. Servicing the M12
63