Patent ID: 6888883
Filing Date: 2005-05-03
Classification: H04L

Abstract:
1. A cable modem capable of reducing noise leakage on the upstream channel in a cable plant comprising: an upstream transmitter having a control line on which the upstream transmitter can emit a control signal; a switch component capable of being enabled and disabled by the control signal on the control line, such that the control signal from the upstream transmitter to the switch component enables the switch component thereby allowing a data signal to be transmitted on an upstream channel; and an amplifier configured to be controlled directly by the control signal for amplifying the data signal from the upstream transmitter before being transmitted on the upstream channel; wherein the upstream transmitter is configured to generate the control signal for implementing (i) a first mode of protection from noise leakage using only the switch if the amplifier cannot switch at a sufficient speed not to cause data loss, and (ii) a second mode of protection from noise leakage using both the amplifier and the switch component if the amplifier can switch at a sufficient speed not to cause data loss.