Allied Telesis AT-S99 - Manual (Page 42)

Chapter 2: AT-CM and AT-CV Media Converter Line Cards
42
Operating Modes
The AT-CM Line Cards support these operating modes:
ˆ Link Test mode
ˆ MissingLink mode
ˆ Smart MissingLink mode
ˆ OAM visible mode
ˆ OAM bypass mode
The AT-CV Line Cards support these operating modes:
ˆ Link Test mode
ˆ MissingLink mode
ˆ Smart MissingLink mode
The operating modes are used to determine the status of the links on the
ports on the line cards, to troubleshoot a link problem, or, in the case of
the AT-CM Line Cards, to implement the OAM-based features.
The operating modes are discussed in the following sections:
ˆ “Link Test Mode,” next
ˆ “MissingLink Mode” on page 43
ˆ “Smart MissingLink Mode” on page 44
ˆ “OAM Visible Mode” on page 45
ˆ “OAM Bypass Mode” on page 45
Link Test Mode
Contrary to its name, the Link Test operating mode is not a diagnostic
utility. When a line card is operating in this mode, the states of the links on
the ports are reflected on the port LEDs and the management software. A
port’s LED will be on and the port’s status in the management software will
be Online when the port has established a link to a network device.
Conversely, a port’s Link LED will be off and its status in the management
software will be Offline when the port has not established a link to a
network device.
This operating mode is typically used when the network devices
connected to the ports of a line card cannot take advantage of the features
of the MissingLink mode, or when you want to use the Link LEDs or the
management software to troubleshoot a network problem. This operating
mode is also useful after the installation of the line cards to verify whether
or not the ports on the cards have established links to their network
devices.