User`s manual

Version 5.4 393 May 2008
SIP User's Manual 6. Auxiliary Configuration Files
6.5 Coefficient File
The Coeff_FXS.dat file 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.
Note: The Coefficient File is applicable only to Mediant 1000.
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 266).
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.
6.6 Dial Plan File
The source file for the Dial Plan configuration contains a list of known prefixes (e.g. area
codes and international telephone number patterns) for the PSTN to which the device is
connected. The device uses this information to detect end-of-dialing in certain CAS
configurations where the end-indicator (ST) is not used. The device supports up to 8,000
distinct prefixes in the dial-plan file.
The CasTrunkDialPlanName ini file parameter determines which Dial Plan (in a Dial Plan
file) to use for a specific trunk (refer to ''Configuring the Trunk Settings'' on page 96). The
Dial Plan can be loaded using the Web interface (refer to ''Loading Auxiliary Files'' on page
266).