Extremely Low prices on Ink and Toner Cartridges

Modems - General Information | Tech Info Home Page | Modem Troubleshooting |

General Information

Modems are used to connect computers to each other and to the internet. There are two types of modems. External and Internal.

To see current modems, drivers or tech support Links go to the Modems page.

Form Information on troubleshooting modem problems go to the "Modem Troubleshooting" page.

Modem Protocols

 

Bell 103

• 300bps transmission

Bell 212A

• 1200bps transmission

v.32bis
Modems that conform to the v.32bis format have a limit of 14.4Kbps

V.34
The V.34 connect at 28.8 Kbps with a theoretical limit of 11520 cps.

V.90

 

56-kbps High Speed

General Information

There are currently ( Sep '97 ) two competing standards in use. The x2 developed by US Robotics and the K56flex developed by Rockwell and Lucent Technologies.

Limitations

• Your phone must be within 3.5 miles of the central office where it is connected (the phone company will test your line while as you talk to them and give you distance of your phone to the central office).
  Longer distances will cause the connection to be 33.6, and sometimes might not be able to make the connection. The distance is at this time critical.
• The theoretical limit is not quiet 56k but more like 53kbps and that is only on the incoming data. Outgoing data is limited to 33.6kbps.

Front Panel Lights

• AA - Auto Answer
• CD - Carrier Detect
• RD - Received Data
• SD - Send Data
• TR - Data Terminal Ready
• CS - Clear to send
• ARQ/FAX - Error Control/ Fax Operations

Links

• Troubleshooting Modems
• Modem Glossary @ Boca Research Link
• help @ modemhelp.com

© 1997,98,99,2000 www.techadvice.com All rights reserved

---