User's Manual

AN-50e

user manual

Page 71 of 96

Ethernet FD/Collision LED

The Ethernet FD/Col LED flashes when packet collisions occur over the LAN.

Figure 39: Front Panel: Ethernet FD/Col LED

Note that when connected to a hub, it is typical for packet collisions to occur

intermittently. On a Half-Duplex link, there will be collisions. Some causes are

listed in the following table.

Table 21: Ethernet Collision Diagnostics

Symptom Possible Problem Solution

Collisions are normal for

Half Duplex links. However,

if the terminal is connected

to is not configured for auto-

negotiation, but manually

set for Full Duplex, then the

terminal will not be able to

negotiate this mode and will

stay set to Half Duplex. This

results in CRC errors on the

network device port.

Change the

configuration from

hard coded Full

Duplex to auto-

negotiation

Link Collision

(FD/Col LED

flashes)

Incompatible Ethernet port

speed.

Confirm speed and

duplex mode of

devices.