Handling fiber-optic cables – IBM System Storage Subsystem DS5020 User Manual
Page 77
Statement 3:
CAUTION:
When laser products (such as CD-ROMs, DVD drives, fiber-optic devices, or
transmitters) are installed, note the following:
v
Do not remove the covers. Removing the covers of the laser product could
result in exposure to hazardous laser radiation. There are no serviceable
parts inside the device.
v
Use of controls or adjustments or performance of procedures other than
those specified herein might result in hazardous radiation exposure.
DANGER
Some laser products contain an embedded Class 3A or Class 3B laser
diode. Note the following.
Laser radiation when open. Do not stare into the beam, do not view directly
with optical instruments, and avoid direct exposure to the beam.
Handling fiber-optic cables
Attention:
To avoid damage to your fiber-optic cables, follow these guidelines:
v
For devices on slide rails, leave enough slack in the cables so 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
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
When storing excess or unused fiber-optic cables, do not bend the cables to a
diameter of less than 76 mm (3 in.), or a radius less than 38 mm (1.5 in.) or wrap
them around themselves. See Figure 25 on page 48.
v
Make sure you have a minimum loop diameter of 76 mm (3 in.) and a minimum
bend radius of 38 mm (1.5 in.) for fiber-optic cables. Loops or bends smaller than
these minimums might cause damage to your fiber-optic cables. Use loop
diameters and bend radii that are greater than these minimums.
v
Do not route the cable along a folding cable-management arm.
v
Route the cable away from places where it can be damaged by other devices in
the rack cabinet.
v
Do not put excess weight on the cable at the connection point. Be sure that the
cable is well supported.
v
Do not use plastic cable ties in place of the provided cable straps.
v
The supported maximum lengths of OM2 category Fibre Channel cable are:
– 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
Chapter 3. Cabling the storage subsystem
47