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Trouble Resolution
Page 4-2
Loss Of Power
If the STH is having power problems, check the power delivery system
(power cable, power outlet, circuit breaker, fuse).
Loss of Contact with Intelligent Hub
If the STACK LED is indicating disconnection from the intelligent hub, it
may be that the intelligent hub has placed the STH in bypass to protect
itself from beaconing conditions or a mismatched ring speed on the STH.
Check the STH for beaconing conditions and make sure that the STH is
operating at the same rings speed as the intelligent hub.
It may be that the STH is physically disconnected from the intelligent hub
by a disconnected or faulty cable. Check the hardware.
Failure to Link on Enabled Port
Check that the Token Ring devices at either end of the cable are powered-
up.
Verify that the network cable’s connectors have the proper pinouts. Refer
to Section 2.5, TCU Specifications.
Check the cable for continuity. A variety of tools are available for this test,
depending on the media you are using.
Check that the cables specifications for dB loss described in Chapter 2.
Ring Speed Fault
The network device being linked at this port is operating at a ring speed
different from the STH’s currently set ring speed. Set the two devices to
the same speed.