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Troubleshooting
16
Cabling
Verification
1. Verify that the cabling type is correct. Be sure all cable connectors are securely
seated in the required ports. Use 100 Ohm Category 5 straight-through cable
for all standard twisted-pair connections.
2. Make sure all devices are connected to the network. Equipment may have been
unintentionally disconnected from the network.
3. This is a Class II hub and can only be cascaded from a repeater port to one other
hub using 5 meters (16 feet) of cabling if the link is operating at 100 Mbps. If
you must connect to more than one hub, use an optional Media Expansion
Module or a switch.
4. If you want to connect to another hub or a switch, use an RJ-45 MDI to MDI-X
connection. If you must cascade to a hub or switch using MDI-X ports at both
ends of the cable (not the MDI port), make sure a crossover cable is used (see
“Making a Connection via an MDI-X Station Port” on page 5). Crossover cable
should only be used if an MDI daisy-chain port is not available.
Network Adapter
Verification
Make sure the network interface hardware and software drivers for the attached
devices are functioning properly. Check the adapter cards and associated drivers
used in any attached workstation or server.
RJ-45 Port and
Cable
Assignments
RJ-45 (MDI-X) station ports (see Figure 11) can be attached to any devices which
use a standard network interface (for example, a workstation, server, bridge or
router). The RJ-45 (MDI) daisy-chain ports can be cascaded to a station port on
similar networking devices (for example, another hub or switch). Use UTP or STP
cable for RJ-45 connections: 100 Ohm Category 3, 4 or 5 cable for 10 Mbps
connections or 100 Ohm Category 5 cable for 100 Mbps connections. Also be sure
that the length of any twisted-pair connection does not exceed 100 meters (328
feet), and that the length of any cascaded connection from a repeater port to
another hub does not exceed 5 meters (16 feet) if the link is operating at 100 Mbps.
Figure 11
RJ-45 Connector