Title :
Upper bounds for the token rotation time in the 802.4 token passing bus
Author :
Montuschi, Paolo ; Valenzano, Adriano ; Ciminiera, Luigi
Author_Institution :
Politecnico di Torino, Italy
Abstract :
A detailed analysis of the cycle time properties of the IEEE 802.4 token bus protocol is presented. It is shown that its average token rotation time (TRT) is upper bounded by Ta, i.e. the maximum of the TRTs regulating the asynchronous transmissions. It is also shown that the token rotation time is upper bounded by (T a+H), where H is the sum of all high-priority token holding times (HPTHTs) of the synchronous queues of the network. These bounds are useful when studying the characteristics of responsiveness of an IEEE 802.4 network, so as to meet the delivery deadlines and the expiration times of the synchronous messages generated at different stations
Keywords :
protocols; token networks; IEEE 802.4 token bus protocol; TRTs; asynchronous transmissions; cycle time properties; expiration times; high-priority token holding times; responsiveness; synchronous messages; synchronous queues; token rotation time; Communication system traffic; Computer integrated manufacturing; Computer networks; Counting circuits; FDDI; Local area networks; Manufacturing automation; Protocols; Telecommunication traffic; Traffic control;
Conference_Titel :
Industrial Electronics Society, 1990. IECON '90., 16th Annual Conference of IEEE
Conference_Location :
Pacific Grove, CA
Print_ISBN :
0-87942-600-4
DOI :
10.1109/IECON.1990.149234
