This attribute indicates the TRM parameter for this connection.
TRM provides an upper bound on the time interval between forward
Resource Management (RM) cells for an ABR source. Since the last
forward RM cell was sent, if at least TRM time has elapsed since
and at least 2 other cells have been sent, the next cell to be
transmitted would be a forward RM cell.
For nailed-up connections, this attribute is determined by the
provisioned value of the maxTimeBetweenRmCell attribute. For
signalled connections, it is indicated in the ABR Additional
Parameters Information Element.