Portable testing device for monitoring communication line activi

Details Portable testing device for monitoring communication line activi Portable testing device for monitoring communication line activi

1985-01-25

1987-05-12

Fleming, Michael R.

Excavating

371 15, G06F 1100

Patent

active

046655212

ABSTRACT:
This invention relates to a portable testing device which is used in a system having a host terminal, a plurality of secondary terminals, and a communication line interconnecting the host and secondary terminals for in-house communication. The transmission line includes a transmit line pair, a receive line pair, and a ground line. The testing device is operated in one of three modes which are selected via a switch on the device. The three modes of operation are:

REFERENCES:
patent: 3941950 (1976-03-01), Dunwoodie
patent: 3986106 (1976-10-01), Shuck
patent: 4034195 (1977-07-01), Bates
patent: 4057847 (1977-11-01), Lowell
patent: 4271514 (1981-06-01), Parras
patent: 4308615 (1981-12-01), Koegel
patent: 4357574 (1982-11-01), Takamisawa
patent: 4399400 (1983-08-01), Rockwell
Advertising sheet for: RS-232 Data Line Testers/Adapters by L-COM Data Products, Nov. 1984.

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