Allied Telesis AT-S102 - Manual (Page 51)

Converteon Management Software User’s Guide
51
MissingLink and
OAM Visible
Mode
This operating mode for the AT-CM3 Line Cards combines the
MissingLink mode and OAM. The ports of a line card in this mode function
exactly as they do in the MissingLink mode, with the additional of the
OAM-based features on Port A, the fiber optic port.
As explained in the previous section, the two ports on a line card set to the
MissingLink mode operate in tandem. If one of the ports does not have or
loses its link to its network device, the companion port on the card is
disabled to prevent it from forming a link with its network device.
For OAM to work in this combined operating mode, there has to be a link
not only on the fiber optic port on a card but on the twisted pair port, too. If
the twisted pair does not have a link, the fiber optic port is disabled and
OAM will not work, even if the fiber optic port is connected to an active
device.
This principal is illustrated in Figure 1. It shows two AT-CM Line Cards,
one in the AT-CV5000 Chassis and another in the remote AT-CV1000
Chassis, connected over fiber optic cable. If the line cards are set to the
MissingLink and OAM operating mode, the fiber optic link that connects
the cards is active only if the twisted pair ports also have links. If either of
the twisted pair ports does not have a link to a network device, the fiber
link is disabled and so is OAM. For example, if the twisted pair port on the
line card in the AT-CV1000 Chassis at the remote site did not have a link
to its device, the fiber optic port on the card would be disabled, along with
OAM.
Figure 1. MissingLink and OAM Operating Mode
FAN1 PS1
RDY
A T -CV5000
Twisted pair cable to
network device
Twisted pair cable to
network device
Fiber optic cable
AT-CV5000 Chassis
AT-CV1000 Chassis