Digital communication link monitoring device

Details Digital communication link monitoring device Digital communication link monitoring device

1982-11-17

1985-12-10

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

370 13, H04Q 900, H04J 302, G06F 1100

Patent

active

045583170

ABSTRACT:
Digital transmission service offerings provided by common carriers are characterized by digital terminations at two or more user locations. The user has access only to the digital clock and data signals. A modem is described which when attached to the digital terminations provides three functions. First it allows the user to pass his data over the digital service channel. Second it measures the digital communication error rate and availability. Third it permits the user to pass a low speed telemetry channel over the digital service in addition to normal user data. The modem measures the digital channel bit error rate and provides a secondary or side channel without interfering with the transmission of normal data.

REFERENCES:
patent: 4271506 (1981-06-01), Broc et al.
patent: 4271513 (1981-06-01), Maejim et al.
patent: 4273955 (1981-06-01), Armstrong
patent: 4279032 (1981-07-01), Smith
patent: 4351059 (1982-09-01), Gregoire et al.
patent: 4397020 (1983-08-01), Howson

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