3
Enabling Auto Negotiation
Configure Auto Negotiation on the McPC 100Mbps by adjusting a two-position
switch, labeled
AN
, on the faceplate next to the fiber connectors. Enable this feature
by moving the switch to the up
ON
position. Disable (default) by moving the switch
to the down
OFF
position.
LED Indicators
The McPC 100Mbps features four diagnostic LEDs. These LED functions include the
following:
FX RCV
Blinks yellow when the McPC 100Mbps is receiving data
TX LNK
Glows green when a twisted pair link is established
FA
Glows green when FiberALert is enabled
FX LNK
Glows green when a fiber link is established
LinkLoss and FiberAlert
The McPC 100Mbps includes the troubleshooting features FiberAlert, TXLL, and FXLL
that help locate
silent failures
on a network. Before attempting to install the
module(s), understand how these features work and react to specific network
configurations.
WARNING
Installing modules without understanding the effects of LinkLoss and FiberAlert can cause
functioning units to appear flawed or even nonfunctional.
Link Integrity
During normal operation, link integrity pulses are transmitted by all point-to-point
Ethernet devices. When an IMC Networks media converter receives valid link pulses,
it knows that the device to which it is connected is up and sending pulses, and that
the copper or fiber cable coming from that device is intact. The appropriate “LNK”
(link) LED is lit to indicate this.
