🚀 go-pugleaf

Michael S. Scheidell (scheidell@fdma.com) wrote:
: I have an ad for a zyxel[?] isdn "modem".
: nt-1, TA, bonding, etc. Normal integrated idsn stuff.

: BUT, this one has DTE rate of 430K, using 2B channels and v.32 compression.

Actually, the modem can go up to 460.8Kbps, and uses V.42b data compression

: Question, anyone used zyxel modems? and why do all the others only 
: support dte rates up to 115K?

without compression, they would argue that there is little need to go 
above 115.2

: Anyway, we have serial ports with risc processors that will keep up with 
: 430k, but am I going down a 'proprietary' path that has no cross roads?

I don't think so.. modem vendors are familiar w/ V.42b, as they already 
use it on analog devices, and have royalty arrangements agreed upon.  A 
ZyXEL Elite 2864I will connect to an IBM waverunner w/ V.42b (only other 
known device to do this that I know of).  Other serial based products 
from other vendors will most likely jump on the bandwagon with future 
products to offer similar compression.. which would logically require a 
higher DTE speed.

LAN based products typically have chosen the hardware compression route, 
by using STAC compression.  this is easier for them, because all they 
need to do is buy a chip, and route their data through it.  

In the future, I would imagine you'll see a compromise of sorts between the 
serial and network based vendors to use a compression scheme that both 
negotiate.

-- 
Brent Mosbrook                                brentm@zyxel.com
Technical Support, ZyXEL                   voice - 714-693-0808
WWW - http://www.zyxel.com                   BBS - 714-693-0762
FTP - ftp.zyxel.com  /pub/other/zyxel        Fax - 714-693-8811