Pulse or digital communications – Repeaters – Testing
Patent
1985-08-05
1990-10-02
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 10, 371 151, 379 96, H04B 138
Patent
active
RE0333689
ABSTRACT:
A voiceband data set network includes a control data set (10), a plurality of tributary data sets (4a, 4b . . . 4n) and a diagnostic control device (5). User-provided data is communicated between the control data set and the tributary data sets via a primary channel within a four-wire private telephone line (11, 12). Diagnostic and control information is communicated between the control data set and the tributaries via a secondary channel within the private line. Diagnostic and control information is communicated between the diagnostic control device and the control data set, with which it is co-located, via a control channel. Each data set includes a data set diagnostic unit (50), or DDU, via which it transmits and receives the diagnostic and control information. Communications among the DCD, DDUs, and primary controllers within the data sets, are carried out on a link-by-link basis, with the DDUs serving as message switching nodes and with communications over each link being principally comprised of requests and reads. The DCD, DDUs and primary controllers communicate in a hierarchy in which requests and reads are always directed downstream. The tributary data sets provided, however, with a way of directing request-type message texts upstream.
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Darling Donald W.
Dennis Thomas M.
Thayer Stevan J.
Zimmer Bonnie A.
AT&T Bell Laboratories
Chin Stephen
Safourek Benedict V.
Slusky Ronald D.
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