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The modem negotiates in real-time, for a desired line transmission rate to accommodate line condition and service-cost requirement.


The line code and rate negotiation process may be implemented at the beginning of each communication session through the exchange of tones between the modems. A four-step MDSL modem initialization process is provided Gateway 7410 Conexant Modem line code and rate capatibility. The handshake protocol and receiver algorithm allow reliable modem synchronization over severely amplitude distorted channels such as standard telephone twisted-pair wire.

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The algorithm makes use of a short length sequence to train a synchronizing equalizer at the receiver. After training to this sequence, Gateway 7410 Conexant Modem matched filter or correlator is used to detect the inverted sync sequence. The detection of the inverted sequence signals the start of the normal reference training of the CAP demodulation equalizers.

An internal state machine Gateway 7410 Conexant Modem an MDSL modem records and monitors the line status and notifies the state change to the other MDSL and also the host processor. In a DMT system a transmitter filter is provided to reduce the length of effective channel impulse response. The implementation of the filter combines time domain convolution and frequency domain multiplication to reduce the needed computation power. The algorithm and corresponding training sequence to train the transmitter filter are provided. The filter coefficients update may occur through a feedback channel.

However, the transmission throughput of a voice-band modem is limited to below atbout 40 Kbps due to the 3. On the other hand the twisted-pair telephone subscriber loop of a computer user has a much wider usuable bandwidth. Depending on the length of the subscriber loop, the bandwidth at a loss of 50 dB can be as wide as 1 MHz. As consumer demand for interactive electronic access to entertainment e. In response, various delivery approaches have been proposed, such as optical fiber links to every home, direct satellite transmission, and wideband coaxial cable. However, these approaches Gateway 7410 Conexant Modem often too costly, and cheater alternatives have emerged, such as the cable modem which uses existing coaxial cable connections to homes and various high bit rate digital subscriber Line DSL modems which use the existing twisted-pair of copper wires connecting a home to the telephone company central office CO.

Several digital subscribe lines DSL technologies have been developed for different applications. An example of prior art use of DSL techniques is the Asymmetrical Digital Subscriber Line ADSL signaling for the telephone loop that has been defined by standards bodies Gateway 7410 Conexant Modem a communication system specification that provides a low-rate data stream from the residence to the CO upstreamand a high-rate data stream from the CO to the residence downstream.

The ADSL standard provides for operations without affecting Gateway 7410 Conexant Modem voice telephone communications, eg. The ADSL upstream channel only provides simple control functions or low-rate data transfers. The high-rate downstream channel provides a much higher throughput. This asymmetrical information flow is desirable for applications such as video-on-demand VOD. ADSL modems are typically installed in pairs, with one of the modems installed in a home and the other in the telephone company's central office servicing that home.

The pair of ADSL models are connected to opposite ends of the same twisted-pair and each modem can only communicate with the modem Gateway 7410 Conexant Modem the other end of the twisted-pair; the central office will have a direct connection from its ADSL modem to the service provided e.

Because an ADSL modem operates at frequencies higher than the voice-band frequencies, an ADSL modem may operate simultaneously with a voice-band modem or a Gateway 7410 Conexant Modem conversation. A typical ADSL-based system includes a server located at the CO capable of providing movies or other data-intensive content, and a set-top-box at the residence that can receive and reassemble the data as well as send control information back to the CO. Meaningful display or use of the downstream content typically requires a sustained data rate through the modem. Due to the sustained data rate requirements, ADSL systems are primarily designed to function under certain operating conditions and only at certain rates. If a subscriber line meets the quality requirements, the ADSL modem can function, otherwise new line equipment must be installed, or line quality must be Gateway 7410 Conexant Modem.

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In particular, the ANSI standard ADSL calls for transmission of up to 6 million bits-per-second Mbps to a home downstream over existing twisted-pair and also for receipt of up to thousand bits per second Kbps from the home upstream. An ADSL modem differs in several respects from the Gateway 7410 Conexant Modem modems currently being used for digital communication over the telephone system.

A voice-band modem in a home essentially converts digital bits to modulated tones in the voice-band 30 Hz to 3. The voice-band modem in the receiving home then recovers the digital bits from the received signal. The current ITU V-series voice-band modem standards e.

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In contrast, an ADSL modem operates in a frequency range that is higher than the voice-band; this permits higher data rates. However, the twisted-pair subscriber line has distortion and losses which increase with frequency and line length; thus the ADSL standard data rate is determined by a maximum achievable rate for a length of subscriber lines, e. Voice-band modem data speeds are limited by at least the following factors: Although an ADSL modem avoids the Gateway 7410 Conexant Modem two factors, it also suffers from subscriber line length limitations and electrical impairments. Figure 4c illustrates how the capacity of a subscriber line decreases with increasing line length for the two existing wire sizes.


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