Ring Bandwidth Optimizer
Original Publication Date: 1988-Jul-01
Included in the Prior Art Database: 2005-Feb-15
Described is a method and device (ring bandwidth optimizer - RBO) that allows a station on a token ring network to release a token immediately following the end of a frame transmission and a predefined number of bytes of gap (0 data) or to release the token after the station sees its own source address in a returning frame. (Image Omitted) Fig. 1 shows a transmit state machine for the RBO. Each transmit (TXSM) state is identified by a rectangular block and a numeric notation. Thus, TXSM state 11 identifies state 11 and so forth. In this sequence, the token is released as soon as the transmitter sends out the last byte of a gap (i.e., at the state transition from TXSM 12 to TXSM 14). This also depends on whether or not the RBO enable bit in a control register (R4 to be described hereinafter) is set.