IBM DS3950, Installation, User'S, And Maintenance Manual, Page: 76 / 252

– 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 DS3950 requires SFP modules. SFP modules convert electrical signals to optical
signals that are required for Fibre Channel transmission to and from RAID
controllers.
Note: The SFPs are preinstalled in the DS3950.
If the SFPs are not preinstalled in your DS3950 hardware, or if you need to replace
them, use the information in this section to install the SFPs into the ports. After
you install the SFP modules, you can use fiber-optic cables to connect the DS3950
to other Fibre Channel devices.
Before installing SFP modules and fiber-optic cables, read the following
information:
v
Do not mix long-wave SFPs and short-wave SFPs on a single storage subsystem.
Use only short-wave SFPs. You can use the DS Storage Manager client to view
the Storage Subsystem Profile to verify that you are not mixing long-wave and
short-wave SFPs.
Attention: Do not use long-wave SFPs or GBICs in any of the Fibre Channel
ports in the DS3950 controllers. (Long-wave SFPs and GBICs are not supported
for use in the DS3950 or any of the attached storage expansion enclosures.)
v The SFP module housing has an integral guide key that is designed to prevent
you from inserting the SFP module improperly.
v
Use minimal pressure when inserting an SFP module into an SFP port. Forcing
the SFP module into a port could cause damage to the SFP module or to the
port.
1.5 inch
(38 mm)
radius
3.0 inch
(76 mm)
diameter
Figure 24. Bending and looping specifications for fiber-optic cables
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IBM System Storage DS3950 Storage Subsystem: Installation, User’s, and Maintenance Guide