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Chapter 5: Diagnostics and Troubleshooting
Page 5-2 Token Ring Switch Module User Guide
5.1.2 Power-up Results
After completion of the power-up diagnostic sequence, all status LEDs on
the ATX front panel should be on (lit), indicating that the modules have
passed the power-up tests.
Refer to Table 5-1 for descriptions of the LEDs during normal operation.
5.2 OPERATIONAL DIAGNOSTICS
5.2.1 Loopback Tests
Built-in local and remote loopback tests can be used to test individual
ports while the ATX is operational. When in local loopback, a port is
disconnected from its network. The ATX generates loopback packets for
the port, and the port loops the packets back without sending them onto its
network.
During a remote loopback test, the port is in normal operation, sending
and receiving packets to its network. The ATX generates loopback
packets which are sent out of the port to a particular destination device on
the port’s network. The destination device echoes the packet back onto the
network, and the originating port receives the packet.
Table 5-1 Meaning of LEDs
LED Meaning
RX Token Ring port is receiving data (LED flashes)
ST Ring status of port, on if port is inserted into the ring
PROC Token Ring processor is ready for operation (LED on)
TX Token Ring port is transmitting data (LED flashes)
16
If LED is on, then port ring speed is set for 16 Mbps, if not on then
port ring speed is set for 4 Mbps
POWER Token Ring module hardware is receiving power (LED on)