T1 channel bank control process and apparatus

Telephonic communications – Subscriber line or transmission line interface

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

379324, 379398, 379413, 379418, 323270, 370522, H04M 1900, G05F 140

Patent

active

058811486

ABSTRACT:
A technique for powering telephone lines using an unbalanced current source and current sink; and a technique for improving attenuation/frequency distribution and return loss (impedance matching) of transformer-coupled wire-line communications circuits by using secondary series capacitance and an AC current pump signal source; and a generation of ringing voltage as positive voltage pulses with respect to a negative power supply voltage; and a technique for removal of AC power ripple by using an active linear floating filter for the purpose of powering telephone line circuits, and a technique for injection of real time tone samples into T1 transmissions circuits by use of a T1 framer idle code register. The combination of the above five circuit techniques provides for the hardware implementation of a single printed circuit board embodiment (Line Interface Unit LIU) of a plurality of communications functions including a T1 channel service unit, a ringing generator, power converters, a ringback tone generator, and a channel bank controller. The LIU supports selectable T1 standards of communications. Dual 12-channel telephone line voice cards plug into the LIU card to provide a complete T1 channel bank control process and apparatus. The invention solves telephone line interface, power filtering, ringing generation, and tone injection problems with lower component complexity, costs, and physical size than prior art solutions.

REFERENCES:
patent: 4150253 (1979-04-01), Knoppel
patent: 4458112 (1984-07-01), Svala
patent: 4472608 (1984-09-01), Burne
patent: 4511763 (1985-04-01), Skidanenko et al.
patent: 4524246 (1985-06-01), Meza
patent: 4563547 (1986-01-01), Booth
patent: 4648019 (1987-03-01), Stahl
patent: 4665547 (1987-05-01), Tuhy, Jr.
patent: 4679132 (1987-07-01), Jirka
patent: 4679232 (1987-07-01), Brooks et al.
patent: 4767980 (1988-08-01), Chen et al.
patent: 4792887 (1988-12-01), Bernitz et al.
patent: 4805171 (1989-02-01), Ewell
patent: 4864609 (1989-09-01), Moisin
patent: 4914690 (1990-04-01), Hagedorn
patent: 4935925 (1990-06-01), Williams et al.
patent: 4951312 (1990-08-01), Tanikawa et al.
patent: 4955053 (1990-09-01), Siegmund
patent: 4964158 (1990-10-01), Okochi et al.
patent: 5134651 (1992-07-01), Ortiz et al.
patent: 5175764 (1992-12-01), Patel et al.
patent: 5323461 (1994-06-01), Rosenbaum
patent: 5444777 (1995-08-01), Condon et al.
patent: 5513173 (1996-04-01), Machemer et al.
patent: 5515433 (1996-05-01), Chen
patent: 5528595 (1996-06-01), Walsh et al.
patent: 5577105 (1996-11-01), Baum et al.
patent: 5633925 (1997-05-01), Handford et al.

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

T1 channel bank control process and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with T1 channel bank control process and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and T1 channel bank control process and apparatus will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1329303

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