protocol often u2018 piggybacks u2019 receive acknowledgement signaling information on the back of data bearing frames together with acknowledgement request signaling the transmit delay associated with the conveyance of a frame 39 s potentially large data payload serves to delay the efficient operation of the protocol this delay will be made worse by excess buffering in the path so the need here is to reduce the size of the fifo buffer 14 the llc protocol embodies a number of logical channels each managed by its own logical link entity lle not shown each lle operates to a set of internal parameters which are required to assume initial default values but which may subsequently be re negotiated at any time to different values through exchange of identity xid signaling transactions one of these parameters is defined by a system timer known as u201c t201 u201d not shown which defines how long the associated lle shall wait for a reply following the transmission of an acknowledgement request before considering retransmission excessive delay in the fifo buffer 14 could cause premature expiry and retransmission that would otherwise have been unnecessary this will reduce the throughput of data which is of course undesirable it will therefore be appreciated that the allocation of radio resources for a given data transfer and the.