itsSnkTtpPSActiveChannel 1.3.6.1.4.1.2928.6.2.16.1.3.3.1.7

The channel to use on a 1+1 protected connection. When a connection is being established, the first established channel will become the active channel. The device will switch to the other channel when it detects a fault on the active channel. The value of this object cannot be changed unless the operational state of the trail termination point is up. primary(1). The primary channel is used. If 1+1 protection switch is not used or supported, the primary channel is the only channel, and the object cannot be set to any other value. secondary(2). The secondary channel is used. none(3). The connection is not established, or is not 1+1 protected. It is not possible to set this value. While the value is none(3), it is not possible to set this object.