Cisco Systems CISCO1751 quick start Conventions, Installing WAN and Voice Interface Cards

Conventions

Conventions

This document uses the following conventions:

•Commands and keywords are in boldface.

•Optional keywords or arguments are in square brackets.

•Variables for which you supply values are in italic.

•Titles of publications and new words or concepts are in italic.

•Information the router displays on the console screen is in screen font.

•Information that you enter at the CLI is in boldface screen font.

Installing WAN and Voice Interface Cards

The Cisco 1751 router supports two slots that can be used to install either WAN Interface Cards (WICS) or Voice Interface Cards (VICS), and one slot that can be used to install only a VIC.

If You Are Installing Voice Interface Cards

The router supports one to three Cisco voice interface cards (VICs). Each VIC provides two ports. You need one VIC port for each voice connection.

Note To transmit voice calls over an IP WAN, you need (in addition to the VICs) at least one WAN interface card (WIC) in the router to provide the connection to the WAN.

There are four types of VIC interfaces, as shown in Figure 3:

•FXS (foreign exchange station) interface connects directly to a standard telephone, fax machine, or similar device. The FXS VIC interface supplies ringing voltage, dial tone, and similar signals to the station. Ports on this VIC are color-coded gray.

•FXO (foreign exchange office) interface connects local calls to a PSTN central office or to a PBX that does not support E&M signaling. This is the interface a standard telephone provides. Ports on this VIC are color-coded pink.

•E&M is a signaling technique for two-wire and four-wire telephone and trunk interfaces. The E&M VIC connects remote calls from an IP network to a PBX for local distribution. Ports on this VIC are color-coded brown.

•The ISDN BRI NT/TE voice interface card provides a client-side (TE) ISDN S/T physical interface for connection to an NT1 terminating an ISDN telephone network and can also be configured to provide a network termination (NT) interface with phantom power. Each of its two ports can carry two voice calls (one over each ISDN B channel), for a total of four calls per ISDN BRI card. At present, the ISDN BRI VIC does not support ISDN devices such as digital telephone, fax, or modem.

Figure 1 shows a typical VIC.

Cisco 1751 Voice-over-IP Quick Start Guide

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