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Figure 101 Key elements of an ADSL system on the CO side
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Protocol (IP) routing capacity within the DSLAM, rather than an additional external device IPDSLAMs, as they are commonly called, focus on the delivery of high-speed Internet services by service providers CPE modems generally offer connectivity on one side to the DSLAM and the central of ce, while providing some form of Ethernet interface for the user Small rewall routers and switches, formerly external and downstream from the modem, are now common within the modem, offering safety and security to the always-on nature of the ADSL service Information and data from the DSLAM to the CPE modem is carried via the ADSL superframe structure The superframe is a large envelope for packaging 68 ADSL frames and one synchronization frame at a time, all in a period of 17 milliseconds Forward error correction (FEC) is used to ensure that the data bits transmitted are valid To further transmit reliable data, two methods of frame transmission are possible: fast data and interleaved data Interleaved data weaves the bits to be transmitted into the superframe to ensure the likelihood of a large cluster of bits in one frame is not corrupted and lost Fast data is simply noninterleaved data Interleaving, while succeeding in reducing potential noise interference at the framing level, increases latency in the transmission of the data Fast data transmission has very low latency, but has the potential for loss of data due to interference Enhancements to ADSL are presently emerging within the technical community ADSL2 (ITU-T G9923 and G9924) focuses on enhancing the present ADSL standards by increasing performance in data rates and reach performance over ADSL, and providing for rate adaptation and power management, among other enhancements ADSL2plus (ITU-T G9925) de nes the doubling of the bandwidth used for downstream data transmission, achieving data rates in the downstream of up to 20 Mbps on lines as long as 5000 feet These enhancements are designed with backward compatibility, allowing rollout at one side or the other without requiring a coordinated dual-side rollout [8] ADSL2 rate and reach performance enhancements approach achievable downstream rates near 12 Mbps and upstream data rates of about 1 Mbps, depending on loop lengths and other factors This is accomplished by improving modulation ef ciency by mandating a
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four-dimensional, 16-state trellis code and 1-bit quadrature amplitude modulation (QAM) constellations, which provide higher data rates on long lines where the signal-to-noise ratio (SNR) is low In addition, using frames with programmable numbers of overhead bits can reduce the framing overhead that ADSL standards contain The ADSL overhead bits per frame are xed and consume 32 kbps, or one frame of the superframe, of actual payload data The ADSL2 overhead bits per frame can be programmed from 4 to 32 kbps, providing an additional 28 kbps for payload data ADSL2 de nes seamless rate adaptation (SRA) as a means of changing the data rate of an ADSL2 connection while in service, without any bit errors or connection interruptions ADSL2 monitors for changes in the channel conditions and adapts the data rate to the new channel conditions without user intervention SRA is achieved as a result of the decoupling of the modulation and framing layers in ADSL2, enabling the modulation layer to change the transmission data rate parameters without modifying parameters in the framing layer ADSL transceivers operate in full-power mode day and night, even when not in use With several million ADSL modems deployed throughout the world operating in this always-on model, wasted power consumption was, and is, an operations issue that the worldwide standards organizations needed to address To address these power issues, the ADSL2 standard provides for two power management modes that help reduce overall power consumption These modes include the L2 low-power mode and the L3 low-power mode The L2 low-power mode takes place at the DSLAM side of the network, enabling statistical power savings by switching to and from low-power mode, based on Internet traf c levels over the ADSL side of the DSLAM The L3 low-power mode takes place at the CPE modem and DSLAM sides and allows the system to enter into a sleep mode when the communication link is not being used for an extended period of time ADSL2plus, as de ned in ITU-T G9925, doubles the downstream bandwidth, which results in an effective increasing of the downstream data rate on lines less than 5000 feet While ADSL and ADSL2 de ne a downstream frequency band up to 11 MHz and 552 kHz respectively, ADSL2plus speci es a downstream frequency up to 22 MHz The ADSL2plus upstream data rate is about 1 Mbps, depending on loop conditions ADSL2plus provides the capability to use only tones between 11 MHz and 22 MHz by masking the downstream frequencies below 11 MHz This feature can help binders that are delivering both ADSL and ADSL2plus services minimize crosstalk at both the central of ce and customer premises ends ADSL2 and ADSL2plus provide the ability to channelize bins in the frequency bandwidth areas to support different channels with speci c link characteristics These reserved channels can support applications like videoconferencing, which requires special dedicated channels to ensure all voice and video packets are received In addition, channelized voice over DSL (CVoDSL) is a means for ADSL2 customer premises to receive more than one voice channel without the need to run more copper pairs to the customer At the University of New Hampshire Inter Operability Laboratory, testing of the ADSL technology has been ongoing since 1997, with testing focusing on the ANSI and ITU-T Recommendations Within the past year, particular emphasis has been on the ADSL2 and ADSL2plus technological advances Like all technology advances, there exist categories of developers at various stages, loosely falling into early developers, active second tier developers and reseller/original equipment manufacturer (OEM) agreements In this period of testing, in large group and day-to-day testing, early developers and active second tier developers have
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