Digit analysis system for private automatic branch exchange tele

Details Digit analysis system for private automatic branch exchange tele Digit analysis system for private automatic branch exchange tele

1975-03-25

1977-04-12

Brown, Thomas W.

179 18AD, H04M 322

Patent

active

040176894

ABSTRACT:
Digit analysis within an electronic private automatic branch exchange telephone system is carried out through interconnected sections of digit decoder circuitry. A first portion of the digit decoder effectively processes dialed impulses originating within the PBX system and determines whether or not the call is to be directed to another line within the system, to a trunk or to the attendant. The contents of an ING and ED memory are continuously monitored and modified, where necessary on a time shared basis with the other calls processed by the system. Direct inward dialing and listed directory number analysis is carried out in a second portion of the decoder which also causes the ING and ED memory to be monitored and modified, where necessary for the processing of the digits. For either internally directed or externally directed calls, the sequentially received digits are initially processed in the units position of the memory and appropriate action is taken as the result thereof. BCD bit values greater than 10 are selectively stored in the tens position of the ED memory for processing of both DID calls and toll restriction analysis.

REFERENCES:
patent: 3671677 (1972-06-01), Lee, Jr. et al.
patent: 3736383 (1973-05-01), LeBaron
patent: 3748396 (1973-07-01), Hestad et al.
patent: 3784757 (1974-01-01), Woolf et al.
patent: 3821485 (1974-06-01), Harrington et al.
patent: 3851109 (1974-11-01), Downs et al.

Affiliated with

Also associated with

Rating

Digit analysis system for private automatic branch exchange tele does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digit analysis system for private automatic branch exchange tele, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digit analysis system for private automatic branch exchange tele will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1282371