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8
Troubleshooting
Troubleshooting
Most problem are caused by the following errors:
Incorrect position of the Frame Type switch. The Hub-7E is
Token Ring ready. The Hub-7E operates with 100VG LAN adapters
with 100VG Token Ring drivers running Token Ring frames. If you
do not have these drivers, keep the Frame Type switch in the Eth-
ernet position. Also note that the HP J2410A AdvanceStack 100VG
Hub-15 does not support Token Ring and cannot be connected to the
Hub-7E in Token Ring mode.
Wrong type of cable. Use only Category 3, 4, or 5 four-pair, un-
shielded twisted-pair cable rated at 100 ohms. If your cable contains
four twisted pairs and supports the IEEE 802.3 Type 10Base-T stand-
ards, it will generally work. You can verify the cable is compatible
with these standards by using the HP J3263A Cable Test Set. (The
older HP 28687A Wire Test Instrument can also be used.) HP also
offers a wire testing service. Contact your HP-authorized LAN
dealer or your local HP sales office for more information.
Bad cable. Try a different cable.
Bundled cable. Bundled cables are not supported. Use unbundled
cables only.
Exceeding the maximum allowable cable lengths. Use up to 100
meters between two nodes for Category 3 and 4 and use up to 200
meters for Category 5.
If the above problems do not exist, try the following:
Try resetting the hub by removing the power cord and re-inserting
the power cord. (Alternatively, you can reset the hub by using the
reset command in the ASCII console as described on page 11.)
Use the troubleshooting table on the next page to check the LEDs.
You may not have a valid topology. A common topology fault is
excessive cable length. If you have trouble after recent changes to a
network, switch back to the previous topology. If you no longer
have any trouble, the new topology is probably at fault. Refer to the
100VG AnyLAN Technology Guide included with this hub, for
topology and configuration guidelines.
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