Troubleshooting Checklist - HP J2415A Installation And Reference Manual

Troubleshooting

Troubleshooting Checklist

Most problem are caused by the following errors:
If the above problems do not exist, try the following:
3-4
Incorrect installation. Incorrectly installing the hub (including any
optional modules) can result in improper operation. If one or all of these
components appear to not be functioning, re-check the installation
procedure in chapter 1 and, if necessary, re-install the component
correctly.
Wrong type of cable. Use only Category 3, 4, or 5 four-pair, unshielded
twisted-pair cable rated at 100 ohms. If your cable contains four twisted
pairs and supports the IEEE 802.3 Type 10Base-T standards, 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 or unbundled cable. Verify you have followed selected the
correct type by reading page 1-16.
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.
Distributed Management Chain is incorrectly wired. If you can't
see chained hubs in HP Stack Manager, verify your hubs are chained like
the illustration on page 1-22. Verify your cables comply with the
specifications in appendix A.
Incorrect topology. You may not have a valid topology. 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.
Reset the hub. Remove the power cord and re-insert the power cord.
(Alternatively, you can reset the hub by using the power-on reset
command in HP Stack Manager, HP Interconnect Manager, or the ASCII
console). You can factory reset the hub (if an HP 100VG SNMP/Bridge
Module is installed in the hub), as described on page 2-15.