Weed Eater 2600 manual Telephony Signaling Interfaces, FXS and FXO Interfaces

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Cisco High-Density Analog Voice and Fax Network Module

Feature Overview

Telephony Signaling Interfaces

Voice ports on routers and access servers physically connect the router or access server to telephony devices such as telephones, fax machines, PBXs, and (PSTN) central office (CO) switches. These devices may use any of several types of signaling interfaces to generate information about on-hook status, ringing, and line seizure.

The router’s voice-port hardware and software must be configured to transmit and receive the same type of signaling being used by the device with which they are interfacing so that calls can be exchanged smoothly between the packet network and the circuit-switched network.

The signaling interfaces discussed in this document include foreign exchange office (FXO), and foreign exchange station (FXS), which are types of analog interfaces. It is important to know which signaling method the telephony side of the connection is using and to match the router configuration and voice interface hardware to that signaling method.

The next three illustrations show how the different signaling interfaces are associated with different uses of voice ports. In Figure 1, FXS signaling is used for end-user telephony equipment, such as a telephone or fax machine. Figure 2 shows an FXS connection to a telephone and an FXO connection to the PSTN at the far side of a WAN; this might be a telephone at a local office going over a WAN to a router at headquarters that connects to the PSTN.

Figure 1

FXS Signaling Interfaces

 

 

 

 

 

 

 

Voice port

Serial or

Serial or Voice port

 

 

 

1/0/0

Ethernet port

Ethernet port

1/0/0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WAN

 

 

 

 

 

FXS

V

 

V

FXS

 

 

 

 

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Figure 2

FXS and FXO Signaling Interfaces

 

 

 

 

 

 

 

Voice port

Serial or

Serial or Voice port

 

 

1/0/0

Ethernet port

Ethernet port

1/0/0

 

 

 

 

 

WAN

 

 

 

 

PSTN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FXS

V

 

V

FXO

 

 

 

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FXS and FXO Interfaces

An FXS interface connects the router or access server to end-user equipment such as telephones, fax machines, or modems. The FXS interface supplies ring, voltage, and dial tone to the station and includes an RJ-11 connector for basic telephone equipment, keysets, and PBXs.

An FXO interface is used for trunk, or tie line, connections to a PSTN CO or to a PBX. This interface is of value for off-premise station applications. A standard RJ-11 modular telephone cable connects the FXO voice interface card to the PSTN or PBX through a telephone wall outlet.

Cisco IOS Release 12.2(2)XT and 12.2(8)T

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Contents Cisco High-Density Analog Voice and Fax Network Module Feature History Release ModificationInterface Feature OverviewBase Module Voice Port NumbersFXS and FXO Interfaces Telephony Signaling InterfacesDisconnect Supervision Commands Delay in Voice Networks FXO Supervisory Disconnect Tone CommandsVoice Level Adjustment Echo CancellationAdaptive Jitter Buffering Cost Effective Voice Activity Detection CommandsServiceability BenefitsSupported low-Complexity Codecs RestrictionsSupported High-Complexity Codecs Supported Medium-Complexity CodecsSupported Platforms Related DocumentsCisco 2600 series Prerequisites Supported Standards, MIBs, and RFCsFXO or FXS Configuration TasksConfiguring Analog FXO and FXS Voice Ports Command PurposeLocale that has been configured Keyword default is 25 on Cisco 2600 seriesDefault is Default is the pattern specified by the cptoneFine-Tuning Analog Voice Ports Configuring Voice Activity Detection VADConfiguring Disconnect Supervision Commands Command to configure a loop-start voice port to not Enables battery reversal. The default is that batteryReversal is enabled For FXO ports-Use the no battery-reversalConfiguring FXO Supervisory Disconnect Tone Commands Voice network module is installed From 0 to 1000 0 ms to 10 sec. The default isSec. The default is Exits voice class configuration modeConfiguring Timeouts Commands Timing Commands Configuring Adaptive Jitter Adjustment Voice Quality Tuning CommandsConfiguring Voice Level Adjustment Configuring Echo AdjustmentPlatform Command Syntax Verifying Analog Voice-Port ConfigurationsTroubleshooting Chart, Voice Port Testing Commands, Troubleshooting TipsKeyword setting also called region tone is US Troubleshooting ChartProblem Suggested Action Reconfigure the voice portConfiguring Voice Level Adjustment section on Voice Port Testing CommandsLoopback Function Tests Detector-Related Function TestsRelay-Related Function Tests Tone Injection TestsVoice port to voice mode Fax/Voice Mode TestsKeyword fax to force the voice port into fax mode Test. Enter the keyword disable to returnAnalog FXO Voice Port Example Configuration ExamplesAnalog FXS Voice Port Example Debug dspapi, Debug hpi, Command ReferenceRelease Modification Defaults Command Modes Command HistoryDebug dspapi Syntax DescriptionRelated Commands Description Usage Guidelines Examples DefaultsCommand Modes Command History Debug hpiCisco 2600, and Cisco 3600 Router Global configurationTo global configuration mode Voice-portEncapsulation Dial-peer voiceGlossary
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