The Linux Modem How-To

12.3 56k Doesn't Work for Dialin

If you expect that people will be able to dial-in to you at 56k, it can't be done unless you have all the following:

• You have a digital connection to the telephone company such as a trunkside-T1 or ISDN line
• You use special digital modems (see Digital Modems)
• You have a "... concentrator", or the like to interface your digital-modems to the digital lines of the telephone company.

A "... concentrator" may be called a "modem concentrator" or a "remote access concentrator" or it could be included in a "remote access server" (RAS) which includes the digital modems, etc. This type of setup is used by ISPs (Internet Service Providers).

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