Multiplex communications – Wide area network – Packet switching
Patent
1991-07-18
1994-03-22
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 951, 379 63, 3408255, H04J 316, H04Q 700
Patent
active
052971422
ABSTRACT:
Data transfer apparatus (211,213) for a radiotelephone peripheral using a time multiplexed data bus for communication with a bus master of the radiotelephone couples peripheral devices external to the radiotelephone and other user information inputting devices, such as a handset for a cellular mobile radiotelephone, to the radiotelephone's central processor and speech processor. The data transfer apparatus generates time slots in frame formats in which the information is sent over the data bus. The entire message, information bits and the header, sent in a time slot from a peripheral device to the bus master is used to determine bus contention. Bus contention resolution during the start-up of data bus operation sets the priority with respect to other data transfer apparati with which a peripheral device's data transfer apparatus is able to access the bus during normal operation.
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Marry Patrick J.
Paggeot Bruce M.
Tripp Jeffrey W.
Jenski Raymond A.
Juffernbruch Daniel W.
Jung Min
Motorola Inc.
Olms Douglas W.
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