3. With the SFP latch in the unlocked position, extract the SFP module.
v For SFP modules that contain plastic tabs, slide the SFP module out of the port.
v For SFP modules that contain wire tabs, grasp the wire latch and pull the SFP module out of the
mini-hub port.
4. Replace the protective cap on the SFP module.
5. Place the SFP module into a static-protective package.
6. Replace the protective cap on the host port.
Handling fibre-optic cables
Important: IBM Fibre Channel (FC) cable options have been tested and approved for the IBM DS storage
products. For optimal performance and compatibility, always use IBM FC cable options when
installing the IBM DS products.
Attention: To avoid damage to your fibre-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 fibre-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 27 on
page 48.
v Loop diameter of 76 mm (3 in.) and bend radius of 38 mm (1.5 in.) for fibre optic cable are IBM
DCS3700 recommended minimums. Loops or bends smaller than this recommendation may cause
damage to your fibre optic cables. It is best practice to use loop diameters and bend radii that are
greater than these recommended 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 following are the supported maximum cable lengths:
– 1 Gbps: 500 meters 50/125 um fibre, 300 meters 62.5/125 um fibre
– 2 Gbps: 300 meters 50/125 um fibre, 150 meters 62.5/125 um fibre
– 4 Gbps: 150 meters 50/125 um fibre, 70 meters 62.5/125 um fibre
o
Protective
cap
Wire
tab
SFP
module
90
Figure 26. Unlocking the SFP module latch - wire variety
Chapter 3. Cabling the DCS3700 47
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