What Are the Requirements for Telephone Service?
What Are the Requirements for Telephone Service?
This section provides hardware and software requirements for using your cable modem for telephone service.
Number of Telephone Devices
The
The maximum number of telephone devices connected to each
The sum of the REN load on all of the telephone devices attached to each port must not exceed 5 REN.
Telephone Device Types
You can use telephone devices that are not labeled with a REN number, but the maximum number of attached telephone devices cannot be accurately calculated. With telephone devices that are not labeled, each device should be connected and the ring signal should be tested before adding more devices. If too many telephone devices are attached and the ring signal can no longer be heard, telephone devices should be removed until the ring signal works properly.
Telephones, fax machines, and other telephone devices should use the center 2 pins of the
Dialing Requirements
All your telephones should be set to use DTMF dialing. Pulse dialing is typically not enabled by your local provider.
Telephone Wiring Requirements
The cable modem supports interior telephone wiring. The maximum distance from the unit to the most distant telephone device must not exceed 1000 feet (300 meters). Use
Important: Connection to an existing or a new permanently installed home telephone wiring network must be done by a qualified installer.
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