Navas 28800-56K Modem FAQTM
(Answers to Frequently Asked Questions)
D. ADVANCED TECHNOLOGIES
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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
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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
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:
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)
that provide high-speed data transmission over conventional telephone lines
ADSL (asymmetric digital subscriber line)
- G.Lite (ADSL Lite)
- HDSL (high-bit-rate digital subscriber line)
- IDSL (ISDL digital subscriber
- RADSL (rate-adaptive digital
- SDSL (single-pair digital
- 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.
(Note: This author cannot vouch for the accuracy of these resources.)
What are "satellite" modems?
An expensive modem allows you to receive (but not send) data at high speed
400 Kbps satellite downlink
Standard V.34 modem uplink over a standard telephone line
Internet connectivity only - email, news, and other services
must be obtained separately.
Trademarks belong to their respective owners.