This object denotes the value for the time
interval during which this LLC shall expect to
receive any PDU from the remote LLC. This
function is not described in the IEEE 802.2
specification [5] but is widely implemented.
The expiration of this timer shall cause the
local LLC to send a PDU to the remote LLC with
the P bit set to '1'.
Any value for this object less than or equal to
the acknowledgement timer shall mean that the
timer is not used.