ZyXEL ISG50-PSTN User Guide - Page 448
Voice Interfaces
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CHAPTER 28 Voice Interfaces 28.1 Overview This chapter shows you how to configure parameters for FXO/FXS, and ISDN BRI channels. 28.1.1 What You Can Do in this Chapter • Use the FXS screen to configure the ISG50's FXS ports for connecting analog phones to your ISG50. See Section 28.2 on page 449. • Use the FXO screen to configure the ISG50's FXO ports for connecting to a traditional PBX's FXS ports. See Section 28.3 on page 450. • Use the BRI screen to configure the BRI line settings to the peer device your ISG50 connects to. See Section 28.4 on page 451. 28.1.2 What You Need to Know The following terms and concepts may help you as you read through the chapter. FXO Channel An FXO channel is a connection from the ISG50 to a traditional PBX (for example a PSTN connection) via one of the FXO ports installed on the ISG50. You must configure how the ISG50 adjusts the signal volume sent to and received from a traditional PBX. FXS Channel An FXS channel is a connection from on of the ISG50's FXS ports to an analog phone. You can configure how the ISG50 adjusts the signal volume sent to and received from a connected device such as an analog phone or a PBX. BRI BRI (Basic Rate Interface) is an Integrated Services Digital Network (ISDN) physical layer standard and used to transmit voice and user data. BRI is used in homes or small companies providing data rates up to 128 kbps. TE/NT TE (Terminal Equipment) refers to an ISDN user device such as an ISDN telephone, video telephone, digital fax machine (also known as G4 fax machine). The NT (Network Terminal) is the termination device between TEs and the ISDN central office (CO). The NT is responsible for ISG50 User's Guide 448
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