Handling fiber optic cables
Attention: To avoid damage to the fiber optic cables:
v Do not route the cable along a folding cable-management arm.
v For devices on slide rails, leave enough slack in the cables so that they do not
bend to a diameter of less than 76 mm (3 in), or a radius less than 38 mm (1.5
in) when extended, or become pinched when retracted.
v Route the cable away from places where it can be damaged by other devices in
the rack cabinet.
v Do not use plastic cable ties instead of the provided cable straps.
v Do not overtighten the cable straps or bend the cables to a diameter of less than
76 mm (3 in) or a radius less than 38 mm (1.5 in).
v Do not put excess weight on the cable at the connection point. Ensure that the
cable is well supported.
v The recommended maximum cable lengths are as follows:
– 2 Gbps: 300 m (984 ft.) of 50/125 um fiber, 150 m (492 ft.) of 62.5/125 um
fiber
– 4 Gbps: 150 m (492 ft.) of 50/125 um fiber, 70 m (230 ft.) of 62.5/125 um fiber
– 8 Gbps: 50 m (164 ft.) of 50/125 um fiber, 35 m (115 ft.) of 62.5/125 um fiber
v Recommended maximum lengths of OM2 category Fibre Channel cable are as
follows:
– 4 Gbps: 150 m (492 ft.) of 50/125 um fiber, 300 m (984 ft.) of 62.5/125 um
fiber
– 8 Gbps: 50 m (164 ft.) of 50/125 um fiber, 150 m (492 ft.) of 62.5/125 um fiber
Installing SFP modules
The storage subsystem requires SFP modules. SFP modules convert electrical
signals to optical signals that are required for Fibre Channel transmission to and
from controllers. After you install the SFP modules, you use fiber optic cables to
connect the storage subsystem to other Fibre Channel devices.
Review the following information before installing SFP modules and fiber optic
cables:
v Use only short-wave SFP modules. Do not mix long-wave and short-wave SFP
modules on a single storage subsystem. Use the Storage Manager Client to view
the Storage Subsystem Profile to ensure that you are not mixing long-wave and
short-wave SFP modules.
Attention: Do not use long-wave SFP modules or Gigabit Interface Converters
(GBICs) in any of the Fibre Channel ports in the storage subsystem controllers.
(Long-wave SFP modules and GBICs are not supported in the storage subsystem
or any of the attached storage enclosures.
v The SFP module housing has an integral guide key that is designed to prevent
you from inserting the SFP module incorrectly.
v Use minimal pressure when inserting an SFP module into a Fibre Channel port.
Forcing the SFP module into a port could cause damage to the SFP module or to
the port.
v You can insert or remove the SFP module while the port is powered on.
v The operational or redundant loop performance is not affected when you install
or remove an SFP module.
v You must insert the SFP module into a port before you connect the fiber optic
cable.
36 IBM System Storage DS3500 and EXP3500 Storage Subsystem: Installation, User's, and Maintenance Guide
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