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公开(公告)号：CA1165477A
公开(公告)日：1984-04-10
申请号：CA368424
申请日：1981-01-13
Applicant: IBM
Inventor： ALVAREZ JOSEPH A III , BRENNEN JOHN F , GOBIOFF BRUCE D , KRUG ROBERT W , SHABE JOHN
Abstract: TIME DOMAIN MULTIPLE ACCESS BROADCASTING, MULTIPOINT, AND CONFERENCING COMMUNICATION APPARATUS AND METHOD A method and apparatus are disclosed for conducting broadcast, multipoint, and conference communications in a TDMA network at various data rates while simultaneously conducting point-to-point communications at other data rates, either between local ports or between geographically remote ports during time intervals within a TDMA burst, which are not necessarily predefined. The disclosed apparatus appends a direct destination address to each point-to-point port communication for transmission over a communications link, to directly address the intended destination port. The disclosed invention appends an indirect destination address to each broadcast communication transmitted over the communications link. A broadcast memory is provided at the receiving end of the communications link, for storing correlated direct addresses which are accessed by the indirect destination addresses, to directly address a plurality of intended destination ports. In this manner, both point-to-point and broadcast-type communications can be carried out for a variety of data rates, during time intervals which are not predetermined within the TDMA burst, and with a high degree of connectivity. MA9-?0-004
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Patent Agency Ranking
公开(公告)号：CA1151325A
公开(公告)日：1983-08-02
申请号：CA370959
申请日：1981-02-16
Applicant: IBM
Inventor： ALVAREZ JOSEPH A III , BRENNEN JOHN F , KRUG ROBERT W
Abstract: MULTIPLE DATA RATE DIGITAL SWITCH FOR A TDMA COMMUNICATIONS CONTROLLER A multiple data rate digital switch for a TDMA communications controller is disclosed which can service a plurality of input/output ports having many different data rates on a time divided basis, either between ports connected to the same controller or between ports connected to different, geographically remote controllers. A transmit burst buffer and a receive burst buffer are connected between the local ports and a TDMA communication link and an intranodal buffer is connected between local ports. A11 three buffers are accessed by a switch control memory which stores ni control words for each of the ports which are scanned m times per TDMA frame, there being a frame rate of f frames per second. Thus, the ports are selected and their data is buffered at a rate Ri which is equal to the product of ni times m times f. In this manner, ports having a variety of data rates can be serviced on a time interleaved basis with maximum connectivity. MA9-80-005
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公开(公告)号：CA1143878A
公开(公告)日：1983-03-29
申请号：CA366998
申请日：1980-12-17
Applicant: IBM
Inventor： ALVAREZ JOSEPH A III , BENSADON JOSEPH M , BRENNEN JOHN F , KRUG ROBERT W
Abstract: DYNAMICALLY VARIABLE PRIORITY, VARIABLE POSITION CHANNELS IN A TDMA BURST The position of a channel of information transmitted from a particular port is varied in response to the changing priority of that port's messages as time passes. Variable priority assignments become necessary when low speed data has been deferred in its transmission until a time just prior to the production of a second unit of data. The effect of changing the priority of deferred data messages in a TDMA burst is to change the relative position of the associated channel within the TDMA burst by means of compiling the address of that message in a higher priority threaded list. The mechanism by which a deferred data message has its priority changed from an initial low value to a subsequent higher value is by measuring the amount of time remaining for retaining a deferred data message relative to the expected time of arrival of the next data message, the impending arrival of a new message causing the priority of the deferred message to be increased, thereby increasing the probability of its successful transmission. MA9-79-005
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公开(公告)号：AU533663B2
公开(公告)日：1983-12-01
申请号：AU6809781
申请日：1981-03-05
Applicant: IBM
Inventor： ALVAREZ JOSEPH A , BRENNEN JOHN F , KRUG ROBERT W
IPC: H04J3/00 , H04B7/15 , H04B7/212 , H04J3/16 , H04Q3/52 , H04Q11/04 , H04B7/14 , H04J3/06 , H04L5/14
Abstract: A multiple data rate digital switch for a TDMA communications controller is disclosed which can service a plurality of input/output ports having many different data rates on a time divided basis, either between ports connected to the same controller or between ports connected to different, geographically remote controllers. A transmit burst buffer and a receive burst buffer are connected between the local ports and a TDMA communication link and an intranodal buffer is connected between local ports. All three buffers are accessed by a switch control memory which stores ni control words for each of the ports which are scanned m times per TDMA frame, there being a frame rate of f frames per second. Thus, the ports are selected and their data is buffered at a rate Ri which is equal to the product of ni times m times f. In this manner, ports having a variety of data rates can be serviced on a time interleaved basis with maximum connectivity.
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公开(公告)号：CA1151326A
公开(公告)日：1983-08-02
申请号：CA372089
申请日：1981-03-02
Applicant: IBM
Inventor： ALVAREZ JOSEPH A III , BENSADON JOSEPH M , BRENNEN JOHN F , BRICKMAN NORMAN F , KRUG ROBERT W
Abstract: MECHANISM FOR SYNCHRONIZATION OF DATA PORTS IN TDMA COMMUNICATION The transmission and reception pattern generators are synchronized for all data ports operating at the same data rate throughout an entire TDMA system. This eliminates the necessity for bit stuffing to accommodate non-integral multiple data rate data ports and yet allows data activity compression operations to be carried out. MA9-79-006
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公开(公告)号：CA1143879A
公开(公告)日：1983-03-29
申请号：CA367340
申请日：1980-12-22
Applicant: IBM
Inventor： ALVAREZ JOSEPH A III , BRENNEN JOHN F , KRUG ROBERT W
Abstract: PRIORITY THREADED MESSAGE BURST MECHANISM FOR TDMA COMMUNICATION To make the most efficient use of the TDMA frame for a satellite communications network, the assignment of each local station's TDMA burst duration is based on a statistical assessment of the demand by local voice and data ports. Occasionally the actual voice and data port demand at a local station exceeds that station's assigned burst duration so that some of the messages which are ready for transmission cannot be transmitted and may be frozen-out. To avoid or minimize the effects of message freeze-out, the various types of messages are categorized into a hierarchy of priorities for transmission. Messages are divided into four basic types, control signaling messages which cannot be interrupted without loss of system control, high speed data messages whose flow cannot be interrupted without the destruction of data and the need to retransmit them, low speed data messages whose transmission can be deferred for short periods, and voice messages which can be frozen-out to a limited extent without destroying the meaning of the aggregate voice signals. MA9-79-004
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