Re: ISDN versus USR 57600bps

Don Castella (
Sat, 23 Nov 1996 10:01:19 -0600

I've seen Sportsters in the store with "Upgradable to X2" on the package.
Check with USR to be sure. Even ADSL is typically only 64K transmit, but
1.5 Megabit receive.

> From: Vangelis <>
> To:
> Subject: Re: ISDN versus USR 57600bps
> Date: Saturday, November 23, 1996 5:57 AM
> > Why are you so excited about isdn?
> > Haven't you ever heard about us robotics 57600 bps modem? you'd better
> > take a look at
> > if you're a lucky guy you will be able to upgrade your modem to this
> > protocol!
> Um, I wouldn't get too hot and bothered about X2 just yet. If what I've
> heard is true, you only get 56k on the receiving side. Sending is still
> 28.8 (or less perhaps), which is fine in most cases but for 2-way video
> your transmits are still same old speed. Plus your ISP has to have some
> kind of special rack-mounted modem bank or something, it wasn't just the
> usual "buy a couple of modems". And from what I've read, only the
> Couriers can upgrade - Sportsters (like mine) are out of luck. So much
> for all those "soft upgrade" promises that came with the DSPs.
> Maybe when ADSL comes out we'll finally get a REAL increase in
> bandwidth. Then again, if the deployment of ISDN is any example...
> -V