On Tue, Apr 10, 2001 at 04:40:21PM -0500, cory.steers.gmu9@statefarm.com wrote:
I believe that both your modem and your "customer" have modems designed for 56 Kbps download and 28 Kbps upload. Most ISPs have 56 Kbps upload and 28 Kbps download (opposite), so that the ISP customer can connect at 56 Kbps. If you both have a 28 Kbps upload modem, that means your "customer" can only download at 28 Kbps. Does this sound right?
56k modems only work at 56k if they connect to a special ISP modem. This is a digital modem (I assume using an ISDN line). As a result, the line from the ISP to your local exchange is all digital, only the connection between your modem and the local exchange is analogue. The ISP modem can make use of this by using some digital signal processing (DSP) techniques to improve the quality of the signal arriving at your modem. However, it doesn't work the other way round, so the transmit speed of a 56k modem is not 56k (I thought it was 33.6k not 28.8k, but I may be wrong). So, if you try to connect two 'consumer' 56k modems together, you will be limited by the lower transmit speed in both directions. HTH... -- David Smith Tel: +44 (0)1454 462380 (direct) STMicroelectronics Fax: +44 (0)1454 617910 1000 Aztec West TINA (ST only): (065) 2380 Almondsbury Home: 01454 616963 BRISTOL Mobile: 07932 642724 BS32 4SQ Work Email: Dave.Smith@st.com Home Email: David.Smith@ds-electronics.co.uk