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To: Dug who wrote (14245)12/4/1998 11:06:00 PM
From: Dug  Read Replies (1) | Respond to of 21342
 
Friday night url

csdmag.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.