Allied Telesis AT-CM70S - Manual (Page 49)

Converteon Media Converter Line Cards Reference Guide
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Table 11 lists the OAM Active and OAM Passive mode behaviors.
OAM Loopback
OAM provides a data link layer frame-level loopback mode, which is
controlled remotely. Loopback is used to test the performance of a link.
Statistics from both the local and remote station can be queried and
compared at any time while the remote station is in OAM loopback mode.
These queries can take place before, during, or after loopback frames
have been sent to the remote station. In addition, an implementation may
analyze loopback frames to determine additional information about the
health of the link (in example, determine which frames are being dropped
due to link errors).
The Converteon™ line cards feature one or two sets of DIP switches,
depending on the model. The DIP switches are Diagnostic Mode and Port
Configuration DIP switches.
ˆ The Diagnostic Mode DIP switches are used to configure the
diagnostic mode positions of the line card.
ˆ The Port Configuration DIP switches are used to manually configure
the operating characteristics of the twisted pair port.
Table 11. OAM Active and Passive Mode Behaviors
Capability
Active
DTE
Passive
DTE
Initiates OAM Discovery process Yes No
Reacts to OAM Discovery process initiation Yes Yes
Required to send Information OAMPDUs Yes Yes
Permitted to send Event Notification OAMPDUs Yes Yes
Permitted to send Variable Request OAMPDUs Yes No
Permitted to send Variable Response OAMPDUs Yes* Yes
Permitted to send Loopback Control OAMPDUs Yes No
Reacts to Loopback Control OAMPDUs Yes* Yes
Permitted to send Organization Specific
OAMPDUs Yes Yes
* Requires the peer DTE to be in Active mode.