Multipoint TBOS interface including backup response unit

Details Multipoint TBOS interface including backup response unit Multipoint TBOS interface including backup response unit

1990-03-30

1992-06-30

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082507, 371 82, H04Q 900

Patent

active

051267306

ABSTRACT:
Individual equipment units are adapted to be connected to a Telemetry Byte Oriented Serial (TBOS) protocol communication link in a bussed fashion. This allows more than one equipment unit to be monitored and controlled over a single TBOS communication link. Each equipment unit includes a multipoint receiver for receiving request messages from and a multipoint transmitter for transmitting response messages to the TBOS communication link. An additional multipoint receiver is adapted to receive response messages from other equipment units being monitored and controlled over the TBOS communication link. When a particular equipment unit is designated either a backup unit or an auxiliary backup unit, it is enabled to transmit response messages for the other equipment units being monitored and controlled if they do not respond in a prescribed interval. Consequently, a telemetry remote unit will receive appropriate response messages even though one or more equipment units being monitored and controlled have failed to respond. This insures that the TBOS communications link will not be taken out of service because equipment units have failed to respond, and that all equipment units that have not failed will continue to be monitored and controlled.

REFERENCES:
patent: 4660201 (1987-04-01), Nakamura
patent: 4775976 (1988-10-01), Yokoyama
patent: 4984240 (1991-01-01), Keren-Zvi et al.
AT&T Compatibility Bulletin No. 149, "Maintenance Standards for Digital Transmission Systems", Issue 3, Sep. 1, 1986, pp. B2-1 through B3-6.
AT&T DDM-1000 User's Manual, "Dual DS3 Multiplexer For Both Loop and Trunk", AT&T 363-206-100, 1988, pp. 1-32.

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