Jeff: Your correct... LU has been quiet. I'm not expecting an LU solution for another month or so.. May timeframe {reference last line of my post}, ... I'm still trying to find out if LU has a solution for 56k down 40k up and a symmetrical mode of 45k. I've located some old news on the topic and went to ITU to look for LU's proposal..
Feb 1,1997
techweb.com
The digital connection at the central office can blast data downstream to the user at 56 kbits/s, but what about upstream rates? Lucent claims its technology will allow an upstream speed of at least 45 kbits/s and could lead to a full, bidirectional 56-kbit/s approach. Observers speculate that Lucent is harboring goodies in its proposal that will allow it to implement the two-way speeds for videoconferencing, an application for which Lucent provides other key silicon.
In contrast, U.S. Robotics and others say that 56-kbit technology will be, like most Internet applications, inherently asymmetric. A standard 28.8-kbit/s rate, they say, is the likely maximum a user can expect upstream.
and this from the Lucent site:
Lucent Technologies announces customers for new low distortion 56 Kbits/s modem transformer
....Transformers provide isolation and balance while minimizing signal distortion within communications networks. The 2802B and 2811B transformers are part of the data access arrangement (DAA), the interface that provides a barrier preventing electrical contact between modems and phone equipment. Located close to the phone jack, the transformers function as an isolation barrier that withstands high voltages between phone lines, the rest of the modem and phone circuitry, and the user.
"Lucent's transformers offer performance benefits--such as low levels of distortion--that are absolutely critical in 56 Kbits/s modem technology," said Greg Johnson, director of engineering for Multi-Tech Systems.
Minimizing signal distortion levels is a requirement of 56 Kbits/s transformers because distortion tends to slow data rates.
"These transformers are coming to market at a particularly ideal time given all the excitement about 56 Kbits/s modem technology," said Joe Berry, electrical design engineer for Lucent Technologies Microelectronics Group. "Lucent, with its patented 56 Kbits/s technology developed by Bell Laboratories, is going to be a major player in this explosive market, and the company expects this transformer to be coupled with many of these modem chip sets."
The 2802B transformer will be sold in quantities of more than 100,000 per year at less than $1. The 2811B transformer, priced in the $1.50 range in quantities of 250,000, is available in sample quantities. Production quantities will be available in May 1997. |
