Cabletron Systems SEH-22

CHAPTER 5: TROUBLESHOOTING

5-2 SEH USER’S GUIDE

2. If the remote station is ready and the LNK LED is on, but no data

passes through the port, one of two conditions may exist:

• Network management has disabled the port.

• The port is segmented either because the collision detector was on

for more than 110 µs or the SEH detected more than 32

consecutive collisions on the attached segment. The affected port

remains segmented until a good packet is transmitted/received

without collisions.

If the LNK LED is still not on, contact Cabletron Systems Technical

Support.

5.2 USING LANVIEW

The SEH incorporates the Cabletron Systems LANVIEW Status

Monitoring and Diagnostics System. LANVIEW LEDs help diagnose

problems such as a power failure or a cable fault. The SEH includes the

following LANVIEW LEDs:

•PWR, for power status

•MGMT, for management status

•RCV (Receive), LNK (Link), and CLN (Collision) for Ethernet

status.

Figure 5-1 provides a quick reference chart of LED locations and

deﬁnitions. This chapter also includes a detailed description of each LED.

SEH Book Page 2 Tuesday, March 19, 1996 4:12 PM