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    TDMA INTERTRANSPONDER COMMUNICATION
    3.
    发明专利
    TDMA INTERTRANSPONDER COMMUNICATION 未知

    公开(公告)号：CA1118920A

    公开(公告)日：1982-02-23

    申请号：CA306986

    申请日：1978-07-07

    Applicant: IBM

    Inventor： ALVAREZ JOSEPH A ,  HIGGINS PATRICK H

    IPC: H04J4/00 ,  H04B7/15 ,  H04B7/212 ,  H04J3/00 ,  H04J3/06 ,  H04B7/185

    Abstract: TDMA INTERTRANSPONDER COMMUNICATION Groups of stations operate in TDMA mode relative to associated frequency-separated transponder segments of a satellite repeater. Stations at radio signaling nodes in all groups key to a common frame timing reference. The TDMA frame is partitioned repetitively into IN GROUP and CROSS GROUP intervals, each susceptible of containing multiple demand assignable burst time slots. Each node may transmit TDMA bursts (of time compressed and time multiplexed information signals) in assigned slots in either interval (or both). Such bursts are carried only on the transponder radio frequency associated with the respective group. Station receivers are adaptive to switch local oscillator frequencies in synchronism with transitions between IN GROUP and CROSS GROUP periods, and thereby adaptive to receive signals from stations in both groups. A frame reference signal carried on the transponder frequency associated with one of the groups is receivable by stations in the same group during IN GROUP mode reception and by stations in the other group during CROSS GROUP mode reception. Consequently stations in both groups may key to that reference signal. The transition (crossover time) from IN GROUP mode to CROSS GROUP mode can be varied in time position to efficiently accommodate demand within and between groups.

    TDMA MULTIPLE RATE DIGITAL SWITCH
    4.
    发明专利
    TDMA MULTIPLE RATE DIGITAL SWITCH 未知

    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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