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To: Perry P. who wrote (8935)	5/17/2000 3:14:00 PM
From: Perry P.	Respond to of 9236

Looks like AMD is making ADSL chipsets. Looks like it is new from the title: Intelligent Access? Data Solutions AMD's New AmDSL? Chipset, AmDSL134 AmDSL135 ADSL High speed data access?pure and simple. In the consumer market, people want quick access to information, shopping, multimedia entertainment, and video via the Internet. More and more business users are telecommuting or working in remote offices that require slow motion video conferencing, email file transfers, and fast linkage to the corporate Intranet. This growing demand for speedy data transport fuels the need for new technologies capable of handling the increased communication traffic. Asymmetric Digital Subscriber Line (ADSL) is a method of transmitting digital data at high bit-rates over installed twisted-pair telephone lines. ADSL can provide Internet access speeds up to 8 Mbps downstream and 640 kbps upstream. This new technology enables Internet service growth without new infrastructure, outside plant additions, or reinvestment. AMD's ADSL Solution AMD provides a two-chip, rate adaptive, ATM-based ADSL solution: the Intelligent Access? data solution. This chipset encompasses the AmDSL134 Analog Front End and the AmDSL135 DMT/ATM Transceiver devices. Along with a line driver/receiver and ADSL transceiver controller, the Intelligent Access data solution provides a complete ADSL solution to address the network market. The AmDSL chipset is applicable for Digital Subscriber Line Access Multiplexer (DSLAM) equipment in the telco's central office. It can also be used in a remote switching location, such as a Digital Loop Carrier (DLC) or access multiplexer. Diagram of the AmDSL? Chipset Solution Diagram shows the AmDSL chipset solution used in DSLAM equipment. Three Key Features of the AmDSL? Solution Speed Options AMD's AmDSL chipset is programmable to support both full rate ADSL and G.Lite speeds. Full rate ADSL achieves speeds up to 8 Mbps downstream and 640 kbps upstream while G.Lite ADSL operates at up to 1.5 Mbps downstream and 512 kbps upstream. The G.Lite advantage is that it can reach near universal service levels since it functions in over 90% of the existing copper plant. AMD's AmDSL chipset can be programmed as an ADSL-Lite? solution that provides G.Lite speed with no splitter required at the customer premises. Power Efficiency Power dissipation is a key element in any ADSL design. Network equipment is often housed in enclosures in the central office or remote sites that must meet certain temperature requirements. Meeting these temperature specifications can be very challenging when hundreds of ADSL lines are operating. The AmDSL chipset offers an efficient solution to help achieve overall power and heat design parameters. Total power dissipation for the chipset is less than 1.0 watts per line for full rate ADSL. The AmDSL134 device is a CMOS Analog Front End (AFE) containing the analog functions needed by the DMT transceiver. The AmDSL135 device is a CMOS DMT transceiver with ATM framer. Industry Standards Compliance The AmDSL chipset supports the ANSI T1.413 Issue 2 ADSL specification. In adhering to this standard, the chipset employs discrete multitone (DMT) modulation, which is also endorsed by ETSI. In addition, the chipset supports the ITU 992.1 (g.dmt: Annex A and Annex B) and 992.2 (G.Lite) standards. AMD is active in ADSL industry standards groups, including ANSI T1.413 and ITU. AMD also participates in ADSL industry organizations, such as the Universal ADSL Working Group and ADSL Forum. AmDSL134 Analog Front End Circuit The AmDSL134 AFE is intended to be used with the AmDSL135 DMT/ATM processor, but may also be used to support other xDSL signal processors. The AmDSL134 device interfaces the incoming analog ADSL signal from the line driver/receiver (LDR), transforms it to a digital representation, and sends it to the AmDSL135 DSP via a digital interface. The AmDSL134 device also performs the reverse function of receiving the digital signal from the DSP and interfacing it in analog form to the LDR. Within the device, the transmit path of the AmDSL134 provides the digital-to-analog conversion (DAC), and the receive function encompasses the analog-to-digital conversion (ADC). Since the AmDSL134 device can operate in either ATU-C or ATU-R mode, a filter interchange controlled by a configuration input pin is present in the device to switch between the two channel directions. The filters use automatic continuous-time tuning to avoid time varying phase characteristics. In addition to these features, the AmDSL134 device integrates automatic gain control (AGC) amplifiers to reduce noise and to provide lower gain paths in case of a high input signal. Programmable low-pass filters for each channel help to reduce echo and out-of-band interference. Distinctive Characteristics of the AmDSL134 Device 0.32 Watt power dissipation (typical) at 3.3 V Power down mode for standby Overall High resolution, 1.1 MHz signal bandwidth 8.8 MS/s analog to digital (ADC) converter 8.8 MS/s digital to analog (DAC) converter 4-bit digital interface 1.0 V full-scale input 1.5 V full-scale output Differential analog I/O Accurate continuous-time channel filtering Third and fourth order tunable continuous-time low-pass filters Automatic gain control support 64-pin TQFP package AmDSL135 ADSL DMT Transceiver with ATM Framer The AmDSL135 device is a CMOS DMT/ATM processor chip designed to work with the AmDSL134 device as an ADSL modem solution. The key function of the AmDSL135 device is to perform the DMT modulation/demodulation between the AmDSL134 digital signal and the ATM interface. In the receive direction, the AmDSL135 device takes the digital bitstream from the AmDSL134 unit, demodulates the signal into constellation points, demaps the constellation into a block of bits, and deframes the bitstream into ATM cells for the standard UTOPIA Level 1 or 2 interface. An alternative Synchronous Link Access Protocol (SLAP) non-ATM interface is also provided. The opposite modulation technique is undertaken in the transmit direction back to the AmDSL134 unit. The AmDSL135 device utilizes Fast Fourier Transformations (FFT), a Frequency Domain Equalizer (FEQ), a Rotor for phase shifting, and 4D Trellis Coding to accomplish the entire (de)modulation and (de)mapping process. The ATM section of the AmDSL135 device provides the framing function for the generic and ATM Transmission Convergence (TC) layers. The generic TC consists of data scrambling and Reed-Solomon error corrections, with and without interleaving. The AmDSL135 device is controlled and configured by an external transceiver controller. The controller loads all programmable coefficients and parameters. The latter also controls the initialization procedure and performs the monitoring and adaptive functions during operation. Distinctive Characteristics of the AmDSL135 Device Power consumption (typical) 1.2 W at 3.3 V Byte interface or Standard Utopia level 1 and level 2 ATM interfaces Rotor and Adaptive Frequency domain Equalizing/Gain Correction Mapping/Demapping of DMT carriers from/to a digital bitstream, including 4D trellis decoding Error and noise monitoring on individual carriers and pilot tones Reed-Solomon encoding/decoding Fast Fourier Transformation modulation/demodulation ADSL Framing/Deframing ATM cell-specific Framing/Deframing (can be bypassed) 144-pin PQFP package Perry P.