Control and state of IP Connectivity.

Values: standBy (0) DSLAM is between tests. This is the default value. This value is written by client when test is finished and when client wishes to stop test prematurely. runTestVMac (1) Written by client when test is to be started and the test may produce frames with Virtual MAC source addresses. done (2) Written by DSLAM when test is completed. busy (3) Written by DSLAM. Whenever the value is ''runTest'' for a connection, the value for any other connection is ''busy''. runTestNoVMac (4) Written by client when test is to be started and the test may not produce frames with Virtual MAC source addresses.

N.B. Values (2) done and (3) busy may not be written by client.

Normal intended sequence of states:

[standby(DSLAM is ready to start test] >>> (client writes) >>> [runTestX(test is being executed)] >>> DSLAM writes >>> [done] >>> (client writes) >>> [standby]

In case a test is running when the client writes the value ''runTest'', then the running test is aborted prematurely before the new test is started. This is done regardless of whether the running test is on the same or another connection.

Valid from: EDA 2.1R1A