Configuring the T3 FEAC Response
The T3 far-end alarm and control (FEAC) signal is used to send alarm or status information from the far-end terminal back to the near-end terminal and to initiate T3 loopbacks at the far-end terminal from the near-end terminal.
By default, the router does not respond to FEAC requests. To allow the remote CSU to place the local router into loopback, you must configure the router to respond to the CSU’s FEAC request by including the feac-loop-respond statement at the [edit interfaces interface-name t3-options] hierarchy level:
If you configure remote or local loopback with the T3 loopback statement, the router does not respond to FEAC requests from the CSU even if you include the feac-loop-respond statement in the configuration. For the router to respond, you must delete the loopback statement from the configuration.
To explicitly configure the router not to respond to FEAC requests, include the no-feac-loop statement at the [edit interfaces interface-name t3-options] hierarchy level: