Cisco Systems DPQ2202 What Are the Requirements for Telephone Service?, Telephone Device Types

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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 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.

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 RJ-11 connectors to connect to the cable modem telephone ports. Some telephones use other pins on the RJ-11 connectors and require adapters in order to work.

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 26-gauge twisted-pair, or larger, telephone wiring.

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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Contents Cisco Model DPQ2202 VoIP Cable Modem User Guide This DocumentImportant Safety Instructions Mitteilung für CATV-Techniker Aviso a los instaladores de sistemas CatvPower Source Warning Ground the ProductHandling Disposable Batteries Verify the Power Source from the On/Off Power LightProtect the Product from Lightning Protect the Product When Moving It Provide Ventilation and Select a LocationDeclaration of Conformity Canada EMI RegulationBenefits and Features IntroductionIntroduction Whats In the Carton? Front Panel Description Battery Illuminates when the battery is fully charged Back Panel Description What Are the System Requirements for Internet Service? Minimum System Requirements for a PCMinimum System Requirements for Macintosh System Requirements for an Ethernet ConnectionDo Not Have a High-Speed Internet Access Account Already Have an Existing High-Speed Internet Access AccountWant to Use the Cable Modem for Telephone Service Where Is the Best Location for My Cable Modem? How Do I Mount the Modem on a Wall? Optional Before You BeginLocation and Dimensions of the Wall-Mounting Slots What Are the Requirements for Telephone Service? Telephone Wiring RequirementsNumber of Telephone Devices Telephone Device TypesConnecting and Installing Internet Devices To connect devicesPort on the back of the cable modem Rev a Installing USB Drivers Installing USB Drivers on Windows 2000 SystemsInstalling USB Drivers on Windows XP Systems Installing USB Drivers on Windows Vista SystemsHow Do I Maintain the Battery Optional Model Only Charging the BatteryUsing the Modem Without a Battery Replacing the BatteryLocation of the Battery Optional Model Only Removing and Replacing the BatteryHow Do I Maintain the Battery Optional Model Only Frequently Asked Questions How do I arrange for cable telephony installation?How many telephones can I connect? Frequently Asked Questions Common Troubleshooting Issues Having Difficulty?Tips for Improved Performance Check and CorrectFront Panel LED Status Indicator Functions BatteryNormal Operations AC Power applied Front Panel LED Status Indicators During Normal OperationsTrademarks DisclaimerDocumentation Copyright Notice Software and Firmware Use NoticeFor Information If You Have Questions