An essay towards a system of mineralogy by Axel Fredrik Cronstedt

By Axel Fredrik Cronstedt

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In some of the new IBM products, the rate is electronically programmable so that the user can use a single card in either a 4 or 16 Mbps m o d e based on the users speed selection for the particular card (and thus the overall speed on the ring). Z3 m Sending Station im Data iTrailer I Ids m 'm. Uken Τ CD Data Trailer 1 MSL. • mm • m Sending Station Figure 9: 16-Mbps Token-Ring Operation 13. Early Token Release In large rings that are operating at 16 Mbps, the idle time on the ring can become a large factor in the performance of the ring.

Uken Τ CD Data Trailer 1 MSL. • mm • m Sending Station Figure 9: 16-Mbps Token-Ring Operation 13. Early Token Release In large rings that are operating at 16 Mbps, the idle time on the ring can become a large factor in the performance of the ring. However, since the token is released o n t o the ring only after the frame has traversed the ring, time waste is occurring. Thus, IBM has implemented on its 16 Mbps products, a technique that allows the source of a frame to release the token as soon as the frame is transmitted.

Other Capabilities On The Token-Ring In this section, we illustrate s o m e uses and specialized features of the Token-Ring, and describe some of the ways that higher-level functions can allocate some of the bandwidth or address space on the TokenRing to achieve certain levels of capabilities. O n e problem with the synchronous token ring is that o n e would like to support on the token ring asynchronous as well as synchronous multiplexing. This is achieved by quasi-synchronous multiplexing, a technique that tries to allow for efficient asynchronous utilization of bandwidth while guaranteeing certain minimum transmission delays for synchronous stations.

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