Data mode signaling system for PCM modem adaptation

A modem, data mode technology, applied in the field of communication, can solve problems such as time-consuming

Inactive Publication Date: 2009-04-01
GEN ELECTRIC CAPITAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It will be appreciated that switching from data mode to start-up mode is time consuming due to the radical structural change between analog modem transmitters and digital modem receivers between pulse code modulation and pulse amplitude modulation once in data mode
[0007] In a typical case, switching from data mode to start-up mode can take as long as 2 to 7 seconds, which is an excessively long time to simply readjust the various transmission parameters in each modem

Method used

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  • Data mode signaling system for PCM modem adaptation
  • Data mode signaling system for PCM modem adaptation
  • Data mode signaling system for PCM modem adaptation

Examples

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Embodiment Construction

[0025] see now figure 1 , the figure shows a PCM modem communication system 10 in which an analog modem 12 is connected to a digital network 16 via an analog local loop 14 and then connected to a digital modem 18 by utilizing the telephone company's central office, CO 20, as described above A central office is used to connect the local loop to the digital network.

[0026] As shown, both analog and digital modems have transmitter and receiver sections, labeled T x and R x .

[0027] It will be understood that CO 20 includes, but is not limited to, an analog-to-digital converter and a digital-to-analog converter, with information flow to the digital modem indicated by arrow 22 and information flow from the digital modem indicated by arrow 24 . It should be noted that the Recommendation G.711 of the Telecommunication Standardization Sector of the International Telecommunication Union stipulates the characteristics and operation steps of the analog-to-digital converter and the...

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Abstract

In a full duplex PCM modem system having an analog and digital modem, a method and apparatus is provided for on-the-fly reconfiguring of analog or digital modem transmitter parameters without switching back to a retrain or startup mode. In one embodiment, the transmitter parameters for the analog modem are modified to take into account channel impairments, in which modified precompensation parameters are sent from the digital modem to the analog modem without switching out of the data mode. In another embodiment, transmit power levels sensed at the analog modem which are non-optimal are adjusted by new parameters sent from the digital modem without having to switch back to the startup mode. In a further embodiment, transmitter parameters in the digital modem are reconfigured to provide more an increased downstream data rate from the digital modem upon sensing improvement in the quality of the downstream channel without switching to the startup mode.

Description

technical field [0001] The present invention relates to the field of communications, and more particularly to a method and apparatus for providing instant adaptation or correction to modems in a PCM modem system using data mode signaling. Background technique [0002] A Start-Up Procedure, detailing a start-up sequence between digital and analog PCM modems, filed September 3, 1999, assigned to the assignee of the present invention, and incorporated herein by reference. For both analog and digital modems, the receiver architecture is capable of measuring channel impairments if a reference shaping sequence is sent by each transmitter. At the end of the start-up sequence, each receiver has enough information to know exactly how impaired the channel is in each direction. [0003] If each receiver knows the level of impairment, they can then design appropriate equalization or pre-equalization structures depending on the application or the direction of the channel. For a digita...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/38H04L5/16H04L29/08H04L1/00H04L25/03H04M11/00
CPCH04L1/0001H04L2025/03808H04L25/03343H04B14/04
Inventor 瑟博尔·莫拉班扎德金大勇约翰·皮罗兹
Owner GEN ELECTRIC CAPITAL
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