Symptom-to-FRU Index

^{IBM-AUSTRIA - PC-HW-Support 30 Aug 1999}

Symptom-to-FRU Index

Symptom-to-FRU Index

This index supports Type 3523 Fibre Channel Hub and GBICs.
The Sympton-to-FRU lists symptoms, error, and the possible causes.
The most likely cause is listed first.

NOTE: Always start with the General Checkout.
For IBM devices not supported by this index, refer to the manual for that device.

NOTE: Do Not look directly into any fiber cable or GBIC optical output.
To view an optical signal, use a mirror to view the reflected light.

Problem    FRU/Action

GBIC installed in one or 1. Power cord

more ports but no LED is lit. 2. Power source

GBIC installed but only the 1. Reseat GBIC

amber LED is lit. 2. GBIC

GBIC installed and both    The hub is not receiving a valid Fibre Channel signal

green and amber LEDs are lit.    from the end node. Do the following:

1. Unplug the fiber cable from the node and, using a mirror,

    verify that an optical signal is present on the cable receiver lead.

    If no red light is visible, replace the cable.

2. Using a mirror, examine the SC connectors on the HBA or disk controller.

    If no red light is visible on the transmitter lead, do one of the

    following:

    a. Restart the device.

    b. Reinstall the device drivers.

    c. Check the HBA or disk controller.

3. If a light is present on both the cable lead and the end node, check the

    HBA or the disk controller.

GBIC is installed, only the    The hub is receiving a valid Fibre Channel signal from the

green LED is lit, but no    end device, but no upper-level protocols are active.

communications occurs 1. Verify that the proper loaded for the appropriate operating

between the devices.     system and that the host has been configured to recognize the

    attached disk devices.

2. Unplug the fiber cable from the end node and verify that an optical

    signal is present on the cable receiver lead.

    If no signal is present, the receiver lead of the cable might be

    defective and the device is streaming loop-down sequences to the hub.

    Replace the cable.

Problem	FRU/Action

GBIC installed in one or	1. Power cord
more ports but no LED is lit.	2. Power source

GBIC installed but only the	1. Reseat GBIC
amber LED is lit.	2. GBIC

GBIC installed and both	The hub is not receiving a valid Fibre Channel signal
green and amber LEDs are lit.	from the end node. Do the following:

	1. Unplug the fiber cable from the node and, using a mirror,
	verify that an optical signal is present on the cable receiver lead.
	If no red light is visible, replace the cable.
	2. Using a mirror, examine the SC connectors on the HBA or disk controller.
	If no red light is visible on the transmitter lead, do one of the
	following:
	a. Restart the device.
	b. Reinstall the device drivers.
	c. Check the HBA or disk controller.
	3. If a light is present on both the cable lead and the end node, check the
	HBA or the disk controller.

GBIC is installed, only the	The hub is receiving a valid Fibre Channel signal from the
green LED is lit, but no	end device, but no upper-level protocols are active.
communications occurs	1. Verify that the proper loaded for the appropriate operating
between the devices.	system and that the host has been configured to recognize the
	attached disk devices.
	2. Unplug the fiber cable from the end node and verify that an optical
	signal is present on the cable receiver lead.
	If no signal is present, the receiver lead of the cable might be
	defective and the device is streaming loop-down sequences to the hub.
	Replace the cable.

More INFORMATION / HELP is available at the IBM-HelpCenter

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Feel free - send a for any BUG on this page found - Thank you.