Sipura SPA3000 User Guide - MyNetFone

The FXS interface is the same as that in the SPA-2000. Please refer to the SPA-2000 section formore details on configuration of this interface.4.2.2. FXO InterfaceThis is the interface to the FXO/LINE port. It controls the exchange of signals between the SPA andthe PSTN line attached to the FXO/LINE port. It draws power from the PSTN line and controls theon/off hook state. This interface can be configured under the [Regional] and [PSTN Line] tabs, withthe following functions:- Polarity reversal detection: SPA can detect polarity reversal of the tip-to-ring voltage as a PSTNdisconnect signal (section 4.7)- CPC signal detection: SPA can detect CPC or momentary removal of tip-to-ring voltage as aPSTN disconnect signal (section 4.7)- Disconnect Tone detection: SPA can detect the occurrence of disconnect tone on the PSTN line;the characteristics of this tone is configurable (section 4.7)- PSTN voice activity detection: SPA can monitor voice activity on the PSTN line and consider thecall has ended if no activity for a long period (section 4.7)- Ring detection: The characteristics of the ringing signal to detect can be finely adjusted with thefollowing parameters:o - lower limit of the frequency of valid ring signalo - upper limit of the frequency of valid ring signalo - minimum duration of valid ring signalo - minimum Vrms of a valid ring signalo - delay in de-asserting a ring signal after it is removed from the PSTN lineo - delay in assert ing a ring signal after it is detected on the PSTN line- DTMF detection: Detects DTMF digits on the PSTN line- FAX Tones detection: Detects FAX CED and CNG tones on the PSTN line- Parallel handset detection: SPA detects if the PSTN line is being used by another extensionsharing the line, if the tip-to-ring voltage drops below the - : Increase or decrease the signal level sent to the PSTN line. The validrange is from -15 dB to 12 dB in 1 dB increment. Note: Increasing this gain may increase the levelof echo heard on the VoIP call leg, while decreasing it may reduce the level of the same echo- : Increase or decrease the signal level received from the PSTN line. Thevalid range is from -15 dB to 12 dB in 1 dB increment. Note: Increasing this gain may increasethe level of the echo heard on the VoIP call leg, while decreasing it may reduce the level of thesame echo- Caller-ID detection and decoding: SPA can detect and decode Bellcore Type I Caller-ID (FSK)signal on the PSTN line after the first ring- : SPA supports 16 impedance settings- Sends these signals to the PSTN Line: Tones, DTMF, On/Off Hook- Miscellaneous parameters for international compliance control:o - Adjust the Tip/Ring voltage on the PSTN lineo - Adjust the minimum loop current at which the SPA canoperateo - If enabled, it limits the loop current to a maximum of 60mA perthe TBR21 standardoo - Set the impedance of the ringer - Adjust the time for the loop current to drop to 0 after the SPA takes theFXO port on-hookTo get the most out of your SPA-3000, it is highly recommended to connect a PSTN service to theLINE port with Type I Caller-ID subscription. This will allow the following additional functionalities:© 2003 - 2004 Sipura Technology, Inc Proprietary (See Copyright Notice on Page 2) 41