To: Dug who wrote (14245 ) 12/4/1998 11:06:00 PM From: Dug Read Replies (1) | Respond to of 21342
Friday night urlcsdmag.com Managing ADSL Signals and Contending with Noise <Signal echoing in a receive channel is another consideration that complicates the design of an ADSL system. When a signal is transmitted from the client or user end of an ADSL link to the CO end, some of the signal will echo back to the client-end receive channel. This is caused by imperfections in the impedance of the telephone line as well as imperfections in the components that were used to match the impedance of the line. Obviously, the echo signal is unwanted, but the designer must recognize and account for its presence when determining the dynamic range of the signals in the receive channel. Specific methods for dealing ith this echo signal will vary, depending upon the use of echo canceling or frequency division multiplexing (FDM) in the ADSL link.> Produtcs New Products Lowest power DSPs <Texas Instruments (TI) announced two new DSPs that extend the capabilities at both ends of the TMS320C54x product family. The TMS320C5420 integrates two DSP processing cores, which are together capable of 200 MIPS, 200 words of on-chip SRAM memory, and a complete set of peripheral capabilities, including six serial ports, a direct memory access (DMA) controller, and a 16-bit host port interface (HPI). The 'C5420 also consumes as little as 0.32 mA/MIPS, or less than 120 mW at 200 MIPS. In 50k quantities, the 'C5402 costs $5.00 per unit, and the 'C5420 is priced at $55.00.> ADSL for client side <Texas Instruments (TI) announced that it is accelerating ADSL high-speed, remote-access technology implementation with the release of a complete PCI client-side solution. The chipset gives PC and modem manufacturers the software and hardware necessary to develop both T1.413 Issue 2 and/or UAWG-compliant universal ADSL splitterless remote-access solutions. Designated the TNET- D2000P, the chipset is based on TI's 1,600-MIPS 'C6000 core DSP technology. The TNETD2000P consists of the following components: ATM PCI interface, digital interface, ADSL transceiver, analog codec, analog line driver, and software drivers, supporting Windows 95/98 and NT 4.0 operating systems. The pricing for the TNETD2000P will be $75.00 in volume quantities of 10,000.> Texas Instruments, 800.477.8924. Product Xpress 112 at www.csdmag.com Dug P.S. So Doctor, Wstl still thinking of using Adi & what was that last company, oh yeah, Pairgain.