Analyze gain of distributed multichannel manufacturing automation protocol network

The DMMAP (distributed multichannel manufacturing automation protocol) network is a high speed local area network. It is fully compatible with the token-passing bus network. There are two problems in DMMAP. The first is how to manage many simultaneously received tokens, and the second is how to decide which medium access control (MAC) frame should be transmitted first, to make the system function smoothly. The authors solved these problems by extending the length of response window and keeping the token for the highest priority data. They found that the extended bandwidth is not proportional to the channel number. The reason of this phenomenon is that the overhead of the response window is proportional to increased channel number, so the curve of service time versus channel number of DMMAP is a parabola. They analyzed this phenomenon and give the formula of the gain of DMMAP compared with manufacturing automation protocol (MAP), and the upper bound and lower bound of response window size