1.5 inch

(38 mm)

radius

3.0inch

(76 mm) diameter

Figure 33. Recommended bending and looping specifications for fibre-optic cables

Installing SFP modules

The DS4700 Express requires SFP modules. SFP modules convert electrical signals to optical signals that are required for fibre channel transmission to and from RAID controllers. After you install the SFP modules, you use fibre-optic cables to connect the DS4700 Express to other fibre channel devices.

Before installing SFP modules and fibre-optic cables, read the following information:

vDo not mix long-wave SFPs and short-wave SFPs on a single storage subsystem. Use only short-wave SFPs. You can use the DS4000 Storage Manager client to view the Storage Subsystem Profile to verify that you are not mixing long-wave and short-wave SFPs.

Attention: In addition, do not use long-wave SFPs or GBICs in any of the fibre channel ports in the DS4700 Express controllers. (Long-wave SFPs and GBICs are not supported for use in the DS4700 Express or any of the attached DS4000 storage expansion enclosures.)

vThe SFP module housing has an integral guide key that is designed to prevent you from inserting the SFP module improperly.

vUse 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.

vYou can insert or remove the SFP module while the port is powered on.

vDo not install an SFP in any port that will not have a fibre optic cable attached. Additionally, it is recommended that you remove any SFP from any port that does not have fibre optic cables attached.

vThe operational or redundant loop performance is not affected when you install or remove an SFP module.

vYou must insert the SFP module into a port before you connect the fiber-optic cable.

58IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide

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IBM DS4700 manual Installing SFP modules