Line concentrator

Details Line concentrator Line concentrator

H - Electricity

04

Q

344/80

H04Q 3/72 (2006.01) H04Q 3/545 (2006.01)

Patent

CA 1137196

ABSTRACT A telephone switching system comprising a central office switching unit and a remote field switching unit controlled by the central office unit. The field unit provides controlled connections between a number of trunks extending from the central office unit and a greater number of subscribers connected to the field unit. The field unit additionally contains a number of intracall lines for establishing a connection between two sub- scribers without the need for sustained trunk connection after the call is established. The central office unit includes a system controller comprising a microprocessor and associated memory units. The system controller receives information interrupts from both the central office unit and the remote field unit as to subscriber calls, subscriber identity, trunk availability and overall system condition alarms. Appropriate control signals are sent from the central office unit to the remote unit to establish the appropriate connections between the units for subscriber connections. Control and data words interrupts travel between the central office unit and the remote field unit over a voice grade, duplex data channel. Control and data words are in binary and serial encoded on PSK carriers transmitted through the data channel. Each unit transmits a distinct carrier, and each unit contains a filter network to separate the incoming and outgoing carriers. The control and data words include parity lists and error correction bits for - 2 - correction of errors in the transmitted words by the system controller. A phase lock loop in each unit demodulates the carrier to remove the serial words. - 3 -

343005

Affiliated with

Also associated with

Rating

Line concentrator does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-719668