Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
2003-11-19
2008-11-18
Singh, Ramnandan (Department: 2614)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
Reexamination Certificate
active
07453896
ABSTRACT:
A method and apparatus is provided for performing longitudinal balance calibration. A differential signal is provided. A calibration of a gain of at least a portion of the differential signal to affect the longitudinal balance associated with the differential signal. Performing the calibration includes: receiving a first portion of the differential signal and determining a gain associated with the first portion; receiving a second portion of the differential signal and determining a gain associated with the second portion; determining a difference between the respective gains of the first and second portions to determine whether the difference is outside a predetermined range of tolerance; and modifying at least of the gain of the first portion and the gain of the second portion based upon a determination that the difference is outside the predetermined range of tolerance.
REFERENCES:
patent: 4431874 (1984-02-01), Zobel et al.
patent: 4620069 (1986-10-01), Godwin et al.
patent: 4910768 (1990-03-01), Sues et al.
patent: 5436953 (1995-07-01), Nilson
patent: 6724880 (2004-04-01), Lynch
patent: 2002/0159548 (2002-10-01), Evans et al.
patent: 2003/0076945 (2003-04-01), Huang et al.
patent: 2007/0003052 (2007-01-01), Hein et al.
Apfel et al, “Signal Processing Chips Enrich Telephone Line-Card Architecture”; Electronics; May 5, 1982; pp. 113-118.
Grandstaff, O. D. ; “Longitudinal Balance Measurement of Central Office Equipment”, IEEE Trans. on Communications, vol. 20, No. 3, Jun. 1972; pp. 382-391.
IEEE Standard: “Test Procedures for Measuring Longitudinal Balance of telephone Equipment Operating in the Voice Band”; ANS/IEEE Std 455-1985 [Whole document].
Grandstaff, “Longitudinal Balance Measurement of Central Office Equipment”, IEEE Tran. On Comm. vol. COM-20, No. 3, Jun. 1972, pp. 382-391].
IEEE Standard Test Procedures for Measuring Longitudinal Balance [ANS/IEEE Std 455-1985]; Pub: Jul. 25, 1985.
Singh Ramnandan
Williams Morgan & Amerson P.C.
ZARLINK Semiconductor
LandOfFree
Method and apparatus for longitudinal balance calibration does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for longitudinal balance calibration, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for longitudinal balance calibration will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4048777