3Com V7111 - VCX 4 Channels Analog FXO Media Gateway User Manual
Also see for VCX V7111: Product guideUser manualUser guideInstallation guideInstallation guide
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3Com VCX V7111 VoIP SIP Gateways User Manual 1019 Set the Boot file name in the BootP server: mp108.ini.10 Activate the BootP and TFTP servers and reset the VCX V7111 Gateway (See“Provisioning for SIP Operation” on page 67, describing VCX V7111 provisioning).The coeff.dat Configuration FileThe purpose of the coeff.dat configuration file is to provide best feed and transmission qualityadaptation for different phone line types. Two different coeff.dat files are needed for VCXV7111 FXS and FXO Gateways. The file consists of a set of parameters for the signalprocessor of the loop interface devices. This parameter set provides control of the followingAC and DC interface parameters: DC (battery) feed characteristics AC impedance matching Transmit gain Receive gain Hybrid balance Frequency response in transmit and receive direction Hook thresholds Ringing generation and detection parametersThis means, for example, that changing impedance matching or hybrid balance requires nohardware modifications, so that a single device is able to meet requirements for differentmarkets. The digital nature of the filters and gain stages also ensures high reliability, no drifts(over temperature or time) and simple variations between different line types.The coeff.dat configuration file is produced by 3Com for each market after comprehensiveperformance analysis and testing, and can be modified on request. The current file supportsUS line type of 600 ohm AC impedance and 40 V RMS ringing voltage for REN = 2.In future software releases, it will be expanded to consist of different sets of line parameters,which can be selected in the INI file, for each port.To support different types of countries and markets, it is necessary to support loading of anew Coefficients.ini file. This file consist of AC and DC line parameters for the peripheraldevices. This file is loaded into the VCX V7111 using the TFTP, in the same way as for thetones.dat file. |
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