Interface module for telephone lines

Details Interface module for telephone lines Interface module for telephone lines

1984-06-06

1986-08-19

George, Keith E.

H04M 1100

Patent

active

046071393

ABSTRACT:
A monolithic module acting as the interface between a modem and leased ("LL") or switched ("SL") telephone lines, mainly characterized in that: 1. It can be formed on a silicon chip (due to the absence of electromechanical relays or similar switching means), and 2. Its architecture is such that it makes it possible, by interconnecting or "stacking" identical modules, not only to attach additional telephone lines, but also to increase the number of allowable modem configurations. The module (10, 10') comprises two controlled-type line amplifiers (DLL, DSL) which exhibit a high output impedance regardless of whether the power supplies are "on" or "off"; two controlled-type line receivers (RSL, RLL) which provide a very high input impedance whether the power supplies are "on" or "off"; and a wrap receiver (WRP) for testing the modem (to the exclusion of the telephone lines) and interconnecting or "stacking" identical modules. The figure shows an embodiment wherein two of the modules are interconnected; various configurations can be obtained depending on the logic state of the control inputs (1 to 4 for module 10 and 1' to 4' for module 10') supplied by the modem.

REFERENCES:
patent: 3716672 (1973-02-01), Fretwell
patent: 3743938 (1973-07-01), Davis
patent: 4039751 (1977-08-01), Couturier et al.
patent: 4070545 (1978-01-01), Diefenderfer
patent: 4203006 (1980-05-01), Mascia
IBM Technical Disclosure Bulletin, vol. 21, No. 11, Apr. 1979, pp. 4559-4560, F. Delaporte et al, "Logic Interface Module".

Affiliated with

Also associated with

Rating

Interface module for telephone lines does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Interface module for telephone lines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interface module for telephone lines will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-394914