Cisco DOCSIS, User Manual

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Chapter 5 Troubleshooting the DOCSIS Cable Modem
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Can I Use my Existing Phone Number with the Cable Modem?
Telephone numbers are portable in some areas. Contact your telephone service
provider for more information about using an existing telephone number.
How Many Telephones Can I Connect?
The RJ-11 telephone-style connectors on the cable modem can each provide
telephone service to multiple telephones, fax machines, and analog modems. The
maximum number of telephone devices connected to each RJ-11 port is limited by
the total Ringing Load of the telephone devices that are connected. Many telephone
devices are marked with a Ringer Equivalent Number (REN). Each telephone port
on the cable modem can support up to a 5 REN load. The sum of the REN load on all
of the telephone devices attached to each port must not exceed 5 REN.