Data set network diagnostic system

Details Data set network diagnostic system Data set network diagnostic system

H - Electricity

04

L

340/71, 354/225.

H04L 1/24 (2006.01)

Patent

CA 1167543

DATA SET NETWORK DIAGNOSTIC SYSTEM Abstract of the Disclosure A voiceband data set network includes a control data set, a plurality of tributary data sets and a diagnostic control device. 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. 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, 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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