Backup apparatus against line defect and backup method against l

Telephonic communications – Centralized switching system – Switching controlled in response to called station...

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

379 26, 379 98, 370 16, 34082516, H04M 308

Patent

active

055154298

ABSTRACT:
A backup apparatus in a communication system, functioning such that when an analog dedicated line is working properly, controllers on a host unit side and a terminal unit side control respective switching circuits so as to connect a modem on the host unit side with the analog dedicated line and a modem on the terminal unit side with the analog dedicated line. Thus, data is transmitted and received between the host unit and the terminal unit over the analog dedicated line. When the defect detecting portion of the modem detects occurrence of a line defect, the controller of each backup unit controls the switching circuit and the ISDN interface portion so as to connect the host unit and the terminal unit over the ISDN network. Thereafter, until the analog dedicated line restores from the defect, data communication is made between the host unit and the terminal unit over the ISDN network.

REFERENCES:
patent: 4119815 (1978-10-01), Frankfort et al.
patent: 4998274 (1991-03-01), Ephraim
patent: 5151896 (1992-09-01), Bowman et al.
patent: 5210740 (1993-05-01), Anzai et al.
J. F. Day, et al., "Networking Voice and Data With A Digital PBX", AT&T Technology, vol. 2, No. 3, pp. 22-29, 1987, Short Hills, NJ.
L. H. Eberl, et al., "Integrated ISDN D-Server For Intelligent Newtorking", Globecom '89, Session 15, Paper 4, vol. 1, pp. 1-4, 27 Nov. 1987, Dallas, TX.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Backup apparatus against line defect and backup method against l does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Backup apparatus against line defect and backup method against l, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Backup apparatus against line defect and backup method against l will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1233441

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.