User`s manual

MP-1xx/H.323
MP-1xx/H.323 User’s Manual 80 Document #: LTRT-00651
8. Save the “usa_tone.dat” and “mp108.ini” files in TFTP folder
9. Set the Boot file name in the BootP server: mp108.ini.
10. Activate the BootP and TFTP servers and reset the MP-1xx Gateway (refer to Section 6.1,
describing MP-1xx provisioning).
6.5 The coeff.dat Configuration File
The purpose of the coeff.dat configuration file is to provide best feed and transmission quality
adaptation for different phone line types. Two different coeff.dat files are needed for MP-1xx/FXS
and for MP-10x/FXO Gateways. 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 (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 parameters
This means, for example, that changing impedance matching or hybrid balance requires no
hardware modifications, so that a single device is able to meet requirements for different markets.
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 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 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 a new
Coefficients.ini file. This file consist of AC and DC line parameters for the peripheral devices. This
file is loaded into the MP-1xx using the TFTP, in the same way as for the tones.dat file.