Downloading The Dat File To A Device - AudioCodes MP-124 User Manual

4.4.2.3

Downloading the dat File to a Device

The purpose of the coeff.dat configuration file is to provide the best termination and
transmission quality adaptation for different line types. The file consists of a set of
parameters for the signal processor of the loop interface devices. This parameter set
provides control of the following AC and DC interface parameters:

DC (V / I curve and max current)

AC impedance matching

Transmit gain

Receive gain

Hybrid balance

Frequency response in transmit and receive direction

Hook thresholds (FXS only)

Ringing generation and detection parameters

Metering parameters
This means, for example, that changing impedance matching or hybrid balance requires no
hardware modifications, so that a single device can meet user-specific requirements. 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 .dat configuration file is produced by AudioCodes for each market after comprehensive
performance analysis and testing and can be modified on request. The current file supports
US line type of 600 ohm AC impedance (and for FXS, 40 V RMS ringing voltage for REN =
2).
The following list describes which coeff.dat file is to be used with which MP device. The
files are located in the Analog_Coefficients_Files folder:
For MP-11x and MP-124RevD FXS coefficients file types:

MP11x-02-1-FXS_16KHZ.dat - supports generation of 16 KHz metering tone and
complies with USA standard.

MP11x-02-2-FXS_16KHZ.dat - supports generation of 16 KHz metering tone and
complies with TBR21 standard (Pan European).

MP11x-02-1-FXS_12KHZ.dat - supports generation of 12 KHz metering tone and
complies with USA standard.

MP11x-02-2-FXS_12KHZ.dat - supports generation of 12 KHz metering tone and
complies with TBR21 standard (Pan European).
In a situation where the selection of the metering type (16Khz or 12 KHz) is not important,
use MP11x-02-1-FXS_16KHZ.dat.
The dat configuration file is produced by AudioCodes for each market after comprehensive
performance analysis and testing, and can be modified on request. The current file
supports US line type of 600 ohm AC impedance and 40 V RMS ringing voltage for REN =
2.
In future software releases, it is to 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 a
new Coefficients.ini file. This file consists of AC and DC line parameters for the peripheral
devices.
User's Manual 34
MediaPack Series
Document #: LTRT-71405