SIP User's Manual
448
Document #: LTRT-12801
MP-500
MSBG
8.4
FXS Coefficient File
The FXS Coefficient file (Coeff_FXS.dat) is used to provide best termination and
transmission quality adaptation for different line types for FXS interfaces. This adaptation is
performed by modifying the telephony interface characteristics (such as DC and AC
impedance, feeding current, and ringing voltage). The
coeff.dat
auxiliary file is produced
specifically 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. To load the
coeff.dat
file to the device, use the
Web interface or specify the FXS
coeff.dat
file name in the device's
ini
file (refer to
''Loading Auxiliary Files'' on page
The
Coeff.dat
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 doesn't
require hardware modifications, so that a single device is able to meet requirements for
different markets. The digital design of the filters and gain stages also ensures high
reliability, no drifts (over temperature or time) and simple variations between different line
types.
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.
Note:
To configure the FXO coefficients, use the parameter CountryCoefficients
(described in Analog Telephony Parameters).
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