Allied Telesis AT-MCF2000, Installation Manual

Page: 40 / 190

Chapter 3: AT-MCF2012LC, AT-MCF2012LC/1 and AT-MCF2032SP Modules
40 Section I: Features
Guidelines to
Using the
Channel
Operating Modes
Here are the guidelines to using the channel operating modes:
❒
The channels on a module can be set to different operating modes.
❒
The operating modes do not block or interfere with the flow of traffic
between the two ports of a channel during normal network operations.
❒
The MissingLink mode is intended for situations where the devices
that are connected to the ports of a channel are able to react to the
loss of a link by performing a specific action, such as sending out
SNMP traps.
❒
Allied Telesis does not recommend using the Smart MissingLink mode
on a channel that is connected to managed devices. As explained in
“Smart MissingLink Mode” on page 39, this mode responds to the loss
of a link on a port in a channel by pulsing the transmitter of the
companion port. A pulsing transmitter may cause problems for a
managed device.
❒
The Link Test and Smart MissingLink modes are particularly useful
after a link failure on a channel port because they allow you to use the
Link LEDs to determine whether or not the ports have established links
with their network devices.
❒
You set the operating modes of the channels with the Mode button as
explained in “Mode Button” on page 51 or with the optional
AT-MCF2000M Management Module.