Verifying GBIC and Cable Signal
Presence
Note
Do Not look directly into any fiber cable or GBIC
optical output. Read “Safety Information” on page 51.
To view an optical signal, use a mirror to view the
reflected light.
Verifying Signal Presence:
In addition to
verifying port LED status, you can verify signal presence
by using a mirror to look for a reflected light at the
fiber-optic cable ends and the GBIC transmitter. To verify
signal presence at the hub end of a link, insert a GBIC into
the hub and place a mirror at the bottom of the SC
connector. If a signal is present, you will see a low
intensity red light in the mirror reflecting from the GBIC
transmitter.
Verifying Node End:
To verify the integrity of the
fiber optic cable at the node end of a link, make sure the
cable is attached to the GBIC at the hub and the hub is
turned on. Dual SC fiber-optic cable connectors are keyed
and will insert into a GBIC in one direction only. Place a
mirror at the node end of the link. A low intensity red light
is visible in the mirror reflection of one of the SC leads, as
shown in the following illustration.
Connector
Keys
If a fiber-optic cable has good transmitter output but a
broken or degraded receiver lead, the end node might
sense a
loop down state. Because the transmitter is good,
the hub responds to the end node valid Fibre Channel
signal and adds the device to the loop. But, because the
end node is not receiving Fibre Channel signals, it will
stream loop-down sequences onto the loop. This prevents
all data communications among the devices on the loop
and will continue to do so until the condition is corrected.
4
IBM Netfinity Fibre Channel HMM
Содержание Netfinity Series
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