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US 2002/0172274 A1Published application
Method of intelligently restricting symbol size in ADSL modems
OwnerArthur J. Carlsoninventor
Life of this patent
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Abstract
In an ADSL modem system, the ATU-C transmitter (or alternatively the ATU-R transmitter) has the option, depending on an estimation of the line speed, for example, to restrict its transmit L and Lp to be a multiple of either 8, 4, or 2. This restriction may be, for example, communicated by the ATU-C transmitter to the ATU-R receiver during initialization.
Claims20
A method of restricting symbol size in an ADSL system comprising:
- obtaining information regarding the data rate during initialization;
- comparing the information to a threshold;
- transmitting symbols using one of a multiple of 8, 4 or 2 bits per symbol if the information is above the threshold;
- and
- transmitting symbols using an integer number of bits per symbol if the information is below the threshold.
2 more elements
A method of restricting symbol size in an ADSL system comprising:
- obtaining information regarding the data rate during initialization;
- comparing the information to a threshold;
- transmitting a message to choose a symbol size that is one of a multiple of 8, 4 or 2 bits per symbol if the information is above the threshold;
- and
- transmitting a message without restriction as to the size of symbols if the information is below the threshold.
2 more elements
An ADSL modem system comprising:
- a first modem having a first transmitter and a first receiver;
- a second modem having a second transmitter and a second receiver, the second modem estimating a maximum receive data rate of the first modem and comparing it to a threshold, the second transmitter transmitting a message to the first receiver that instructs the first transmitter to transmit data using a pre-selected number of bits per symbol based on the comparison.
Dependencies are inferred from the claim text.