IBM Storage Networking SAN256B-7 Installation, Service And User Manual page 91

All 16 ICL ports can be used for 2 km distances when 20 buffer credits are configured per virtual channel.
Time and items required
The installation or replacement procedure for one transceiver takes less than 5 minutes. Ensure that the
following items are available:
• Required number of compatible power cables
• Required number of supported Brocade-branded transceivers
• Required number of compatible fiber-optic cables
Precautions specific to transceivers and cables
DANGER: Use only optical transceivers that are qualified by Broadcom and comply with the FDA
Class 1 radiation performance requirements defined in 21 CFR Subchapter I, and with IEC 60825
and EN60825. Optical products that do not comply with these standards might emit light that is
hazardous to the eyes.
CAUTION: Do not use the port cover tabs to lift the module. They are not designed to support the
weight of the module, which can fall and be damaged.
CAUTION: Before plugging a cable into any port, be sure to discharge the voltage stored on the
cable by touching the electrical contacts to ground surface.
Cleaning the fiber-optic connectors
About this task
To avoid problems with the connection between the fiber-optic transceiver (SFP+ or QSFP) and the fiber
cable connectors, clean both connectors each time you disconnect and reconnect them. Dust can
accumulate on the connectors and cause problems such as reducing the optic launch power.
To clean the fiber cable connectors, use a fiber-optic reel-type cleaner. When not using an SFP+ or QSFP
connector, make sure to keep the protective covering in place.
Cable management
The minimum radius that a 50-micron cable can be bent under full tensile load is 5.1 cm (2 in.). For a
cable under no tensile load, that minimum is 3.0 cm (1.2 in.). Cables can be organized and managed in a
variety of ways, for example, using cable channels on the sides of the rack or patch panels to minimize
cable management. Following is a list of additional recommendations:
• Plan for the required rack space for cable management before installing the switch.
• Leave at least 1m (3.28 ft) of slack for each port cable. This slack provides room to remove and replace
the switch, allows for inadvertent movement of the rack, and helps prevent the cables from being bent
to less than the minimum bend radius.
• If you are using ICL Trunking, consider grouping cables by trunking groups. The cables used in trunking
groups must meet specific requirements, as described in the Fabric OS Administrator's Guide.
• For easier maintenance, label the fiber-optic cables and record the devices to which they are
connected.
• Keep LEDs visible by routing port cables and other cables away from the LEDs.
• Do not route the cables in front of air vents.
• Use Velcro-type straps to secure and organize fiber-optic cables.
• Route the cables away from LEDs to keep them visible.
CAUTION: Before plugging a cable into any port, be sure to discharge the voltage stored on the
cable by touching the electrical contacts to ground surface.
Chapter 5. Installing transceivers and cables 67