About Fiberalert - IMC Networks AccessEtherLinX Operation Manual

About FiberAlert

The AccessEtherLinX includes an advanced troubleshooting feature, FiberAlert, which
minimizes the problems associated with the loss of one strand of fiber. If a strand is
unavailable, the AccessEtherLinX notes the loss of link. The device will then stop
transmitting data and the link signal until a signal or link pulse is received. The result
is that the link LED on both sides of the fiber connection will go out, indicating a fault
somewhere in the fiber loop. Using FiberAlert, a local site administrator is notified of
a fault and can quickly determine where a cable fault is located.
FiberAlert is not available/applicable on single-strand fiber products.
Enable FiberAlert on ONE side of a media conversion only; Enabling it on both sides would
Auto-Negotiation, Duplex Mode and Speed
The twisted pair ports on the AccessEtherLinX Auto-Negotiate for speed and duplex
mode. This device can also selectively advertise or force the speed and duplex
mode. If the device has a fiber Uplink port, it does not Auto-Negotiate; it always
operates at 100 Mbps Full-Duplex.
Auto-Negotiation
The AccessEtherLinX ships with Auto-Negotiation enabled on the twisted pair ports.
In this mode, the twisted pair port negotiates for speed and duplex mode.
Forcing the Speed and Duplex Mode
The twisted pair downlink ports on the AccessEtherLinX/4 can also be manually set
for 10 Mbps or 100 Mbps operation and for Half- or Full-Duplex (i.e. 10 Mbps Full-
Duplex, 10 Mbps Half-Duplex, 100 Mbps Full-Duplex or 100 Mbps Half- Duplex).
Selective Advertising
Selective Advertising, when used in combination with Auto-Negotiation, advertises
only the configured speed and duplex mode for the twisted pair port.
If a specific speed and/or duplex mode is desired, use Selective Advertising, rather
than Force Mode, when connecting to devices that ONLY Auto-Negotiate.
NOTE
NOTE
keep both transmitters off indefinitely!
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