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- Subject: Re: DSVD voice/data modem info
- Date: Sat, 17 Feb 1996 00:57:29 GMT
- Organization: PacketWorks Public Newsserver
- Message-ID: <4g2uk6$mku@siesta.packet.net>
- References: <4fs6lo$r7s@nntp.crl.com>
- NNTP-Posting-Host: srq112.packet.net
- X-Newsreader: Forte Free Agent 1.0.82
-
- jatwood@a.crl.com (Jeff Atwood) wrote:
-
- >Hello all,
-
- >Just wanted to relate my experiences with the new breed of DSVD modems
- >(specifically the USR Sportster Vi DSVD 28.8 modem), and ask a few questions.
-
- >First of all, these things actually work. I guess I've been around computers
- >so long that it's amazing when a product actually lives up to the hype. Here's
- >the scoop for those of you that are interested.
-
- >First, you must append -SSE=1 to your AT command; this enables DSVD mode. It's
- >off by default. Otherwise the modem acts like a "normal" V.34 modem in every
- >way.
-
- >When a data/voice connection is initiated, the handset is muted. Then, after a
- >brief pause while the modems connect, there is a short scratchy noise, a
- >series of beeps, and then BAM! you're connected via the modem and you can
- >talk, too. The full duplex voice channel is fairly clear. That's not to
- >say that it's crystal clear, but there is little or no loss in voice
- >quality, just a little scratchiness around the edges. Sometimes I got a
- >strange "echo" effect on my end, but the voices were still relatively clear.
-
- >According to USR, 9.6kbps goes to the voice channel and 19.2kbps goes to the
- >data channel. However, we were getting around 2300 cps for data transfer while
- >talking, so the voice channel can't be taking up very much or else it's being
- >compressed.
-
- >At any time during the connection, you can hang up the phones, which closes
- >the voice channel and the data channel gets full 28.8kbps. This does indeed
- >work; once we hung up, our transfer rate went up to about 2650cps.
-
- >During a data connection, if you pick up the phone, the modem "rings" on the
- >other end. The phone itself does not ring; just the modem. And you hear a
- >ringing tone on the handset. Once the person on the other end picks up the
- >handset, there is a short scratchy sound and then you're talking to the other
- >person again. The transfer rate goes back down to 2300cps or so.
-
- >Furthermore, we played an extensive (2+ hour) game of Duke Nukem 3D over the
- >modem while talking to each other, and had no problems at all. I'm very
- >impressed with this product!
-
- >One of the nicest things about it is that you can effortlessly switch between
- >voice, voice/data, and data. It struck me while transferring files and doing
- >other collaborative things with the person on the other end that this was just
- >a far more natural way to work with modems. You can really walk someone
- >through sending you a file, or tech support, or just get more work done rather
- >than resorting to a second line for the same effect-- assuming that the people
- >on both end have a DSVD enabled modem. Suffice it to say that I
- >am very satisfied with the product!
-
- >Now, for the questions.
-
- >1. Will DSVD modems from different manufacturers work together? The documents
- >I could find related to this on the WWW seem to indicate "yes," that any modem
- >branded DSVD follows the DSVD spec and will interoperate. Anyone know for
- >sure?
-
- >2. What's this I head about ASVD and the other technologies that are to
- >"supersede" DSVD? Fortunately, this USR model is the only Sportster that has
- >flash ROM, so I assume that USR will keep me current.
-
- >Any comments or questions welcomed! And of course I do not in any way represent
- >or work for USR.
-
- >Jeff Atwood
- >JAtwood@a.crl.com
-
-
- WOW. I have never heard of that ... WAIT, my Bitsurfr PRO allows me
- to connect at 115k bonded, and then pick up the phone and CALL anyone.
- The Bitsurfr PRO drops to 56k, and once I hang up it re-bonds to 115k.
- Even allows incoming calls when I am bonded ... BTW the calls ARE
- crystal CLEAR!
-
-
-
-