Replacing Cables
Replacing Cables
This cable management topic describes:
The importance of labeling each cable end●
Special handling considerations for fiber-optic cables●
How to maneuver a cable through the cable management system (CMS) of an IOAM enclosure●
Note: IOAM enclosures and their cables are field-replaceable units (FRUs), and must be replaced by HP
trained service providers. For more information about cabling an IOAM enclosure, see the Modular I/O Installation
and Configuration Guide, located in the NTL Hardware Service and Maintenance library.
Tools
For the best results, use cable management tools such as
wire cutters (to cut cable ties)●
cable ties, tie wraps (to secure cables to cable tie mounts in an IOAM enclosure)●
labels (see below)●
Labeling Cables
Use labels to describe a CRU or FRU's group, module, and slot number in an enclosure. See Figure: Labeled
Cable. Use consistent terminology and conventions. For example, if the numbering scheme appears (24, 2, 3),
the numbers indicate group 24, module 2, slot 3.
HP recommends that you include this label information:
CRU or FRU type●
Connected-to rack name, rack offset, and locator text (if applicable)●
Connected-to group.module.slot.●
Connected-to port●
Connected-from rack name, rack offset, and locator text (if applicable)●
Connected-from group.module.slot.●
Connected-from port●
Before you disconnect a cable, check that both ends of the cable are labeled.
If you reuse a cable for any reason, change the labels at both ends to reflect the new information.
Fiber-Optic Cables
Fiber-optic cables enable you to place enclosures farther apart than you can with ECL or serial-copper cables.
Multimode fiber-optic (MMF) cables are recommended for use between MSEBs if you use fiber-optic cables.
Single-mode fiber-optic (SMF) cables connect an MSEB to cluster switches. MMF cables are usually orange, and
SMF cables are usually yellow.
The cable management system (CMS) maintains minimum bend radius and provides strain relief for fiber-optic
cables, which are less robust than copper cables and require a minimum bend radius control.