Scientific Atlanta EPX2203 Telephone Service Telephone Requirements, Number of Telephone Devices

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Telephone Service: Telephone Requirements

Introduction

This section provides hardware and software requirements for utilizing 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 additional 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 of your telephones must support Dual Tone Multi-Frequency (DTMF) touch-tone dialing.

Important: Pulse dialing is not supported.

Telephone Wiring Requirements

The cable modem is designed to support 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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WebSTAR DPX2203 or EPX2203 VoIP Cable Modem User’s Guide

4004041 Rev A

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Contents WebSTAR DPX2203 EPX2203 VoIP Cable Modem User’s Guide Overview IntroductionThis Guide This Section Important Rules for Safe OperationCleaning the Equipment PlacementRead and Retain These Instructions Important Rules for Safe Operation Power Sources Power Cord ProtectionDamage that Requires Service GroundingSection B Before You Begin Check Your Equipment Equipment ChecklistSection C Front and Back Panel Components Front Panel Components WebSTAR Cable Modem Front PanelBack Panel Components WebSTAR Cable Modem Back PanelFunctions of the Front Panel Lights Initial Power Up, Calibration, and RegistrationFront Panel Lights During Normal Operations Normal OperationsFront Panel Lights During Special Conditions Special ConditionsInternet Service Overview Section D Internet Service InstallationInternet Service Before You Begin Contacting Your Local Cable Service ProviderSelecting a Location for Your Modem Minimum System Requirements for PCs Internet Service System RequirementsInstallation Diagram Internet Service Install the Cable ModemInstalling the Modem for High-Speed Data Service Microsoft Windows 95, 98, 98SE, and ME Internet Service Configure TCP/IPResults Microsoft Windows XP Microsoft WindowsMacintosh Microsoft Windows 98, 98SE, or ME Internet Service Install USB DriversMicrosoft Windows Microsoft Windows XP Frequently Asked Questions Internet Service Frequently Asked QuestionsCommon Troubleshooting Suggestions Internet Service TroubleshootingCheck and Correct Telephone Service Overview Section E Telephone Service InstallationTelephone Service Before You Begin Selecting a Location for Your Modem Telephone Wiring Requirements Telephone Service Telephone RequirementsNumber of Telephone Devices Telephone Device TypesInstalling the Cable Modem to Provide Telephone Service Telephone Service Install the Cable ModemInstallation Diagram Installing the Cable Modem Can I use my existing phone number with the cable modem? Telephone Service Frequently Asked QuestionsThere is no dial tone when I lift the telephone handset Telephone Service TroubleshootingDisclaimer TrademarksDocumentation Copyright Notice Software Use NoticeFCC Compliance United States FCC ComplianceFCC Declaration of Conformity FCC Part Canada EMI RegulationIC Industry Canada Notice If You Need Technical Assistance For Information