HP Surestore FC Swtich 6164 Quick Start Guide

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DIAGNOSTICS
The 2250 switch is designed for maintenance-free operation. It contains
self-diagnostic capabilities that provide switch status and operating
statistics. In the case of a failure, the self-diagnostics aid in isolating the
problem.
The 2250 switch has loopback paths incorporated into the switch hardware.
Internal Fibre Channel port logic functions and the paths between the
interfaces and central memory are verified by an internal loopback path test
within the switch. An external loopback path test that includes the main
board, fixed media, and the GBIC module, checks installed fibre cables and
port fault isolation in cross-port configurations. This test requires external
cables to be looped from one port to another.