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Navas 28800-56K Modem FAQTM
(Answers to Frequently Asked Questions)
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![[Modem Picture]](images/modem.gif)
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D. ADVANCED TECHNOLOGIES
Copyright 1999-2017
The Navas
GroupSM, All Rights Reserved.
Permission is granted to copy for private non-commercial use only.
Send mirror and commercial license inquiries to John Navas.
Posted as <http://modemfaq.navasgroup.com/faq_d.htm>.
Important Notes:
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Privacy Policy: This site makes no use of personal information;
does not require registration; and does not use browser "cookies."
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Copies of this (or other Web) document may be obtained by email from a
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The author has no present connection with any modem company (other than
as a customer), and does not endorse the products of any company. This
information was compiled by the author and is provided as a public service.
Neither the author nor any organization mentioned herein are responsible
for any errors or omissions, or for any consequential problems that might
result. USE AT YOUR OWN RISK.
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The author does not have the time to give individual technical support,
so please do not email requests for assistance. Instead, post them
to Usenet. Thank you.
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Email comments and suggestions to John Navas
What is ISDN?
Probably the most likely successor to V.34, ISDN (Integrated Services Digital
Network) provides up to 2-4 times the speed of V.34 over a standard local
telephone line by using digital, rather than analog, signals. Years in
the making, ISDN is finally being widely deployed in the U.S. at the time
of this writing. To use ISDN you will need special, expensive equipment.
A problem is that ISDN transmissions are typically not compressed; as a
result, with compressible data the speed of a V.34 modem is often comparable
to a single ISDN channel. In the opinion of the author, V.34 will probably
be a cost-effective alternative to ISDN for years to come.
Although ISDN is a digital transmission medium, there are some ISDN
products that will also allow you to connect to conventional analog modems
(e.g., USR Courier
I-modem with ISDN/V.34, ZyXEL
Elite 2864I, and ZyXEL
Prestige 2864I).
Microsoft has released the Dial-Up
Networking 1.4 Upgrade for Windows 95, which enables Windows 95 to
make Dial-up Network connections over ISDN lines, as well as other improvements
and bug fixes. It includes (and replaces) all of the improvements previously
released in previous versions.
ISDN information is available at:
See also:
What are "cable modems?"
A "cable modem" is a
device that provides high-speed access to the Internet
through a cable TV system. For more information, see
What are ADSL, SDSL, IDSL, HDSL, and VDSL?
Digital Subscriber Line (DSL)
technologies
that provide high-speed data transmission over conventional telephone lines
include:
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ADSL (asymmetric digital subscriber line)
- G.Lite (ADSL Lite)
- HDSL (high-bit-rate digital subscriber line)
- IDSL (ISDL digital subscriber
line)
- RADSL (rate-adaptive digital
subscriber line)
- SDSL (single-pair digital
subscriber line)
- VDSL (very-high-bit-rate
digital subscriber line)
For more information, see
What are "wireless" modems?
In the opinion of this author, wireless (particularly spread spectrum)
technology may represent the real future of modem communications.
General Information:
Technical Information:
Other Resources:
(Note: This author cannot vouch for the accuracy of these resources.)
Products:
Services:
What are "satellite" modems?
An expensive modem allows you to receive (but not send) data at high speed
by satellite.
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DirecPC
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Details:
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400 Kbps satellite downlink
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Standard V.34 modem uplink over a standard telephone line
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Internet connectivity only - email, news, and other services
must be obtained separately.
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Distributors:
Trademarks belong to their respective owners.
