VDSL transmission systems

Details VDSL transmission systems VDSL transmission systems

2006-05-23

2006-05-23

Tse, Young T. (Department: 2637)

Pulse or digital communications

Transceivers

Modems

Reexamination Certificate

active

07050489

ABSTRACT:
One problem, frequently encountered with VDSL transmission systems, is that upstream FEXT produced by system users having short wires can be very strong. Users having shorter wires get high bit rates whereas users having longer wires get low bit rates. In extreme cases it may happen that users with wire lengths greater than 1000 meter cannot transmit data upstream. The present invention provides a VDST transmission system with a plurality of modems. The modems are located at varying distances from a central station. There is a target bit rate for each modem. That modems on shorter wires have control means for reducing their transmit power. This reduces the FEXT produced by these modems enabling modems on longer wires to transmit at higher bit rates.

REFERENCES:
patent: 5887032 (1999-03-01), Cioffi
patent: 6647058 (2003-11-01), Bremer et al.
patent: WO 9923764 (1999-05-01), None

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