This attribute indicates the type of framing for the link layer data
received and transmitted on this channel. This attribute has one of
the following values:
btdsFraming: Bit transparent framing for the
TdmaIwfBearerChannel components on MVP cards.
mtxFraming: DMS-MTX InterSystem Link Protocol (ISLP)
framing required for the TdmaIwfBearerChannel components on
DS1C/E1C cards.