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.