User`s manual

Mediant 1000
H.323 User's Manual 372 Document #: LTRT-83401
16.2.1 PRT File Format
The PRT dat file contains a set of prerecorded tones to be played by the Mediant 1000
during operation. Up to 40 tones (totaling approximately one minute) can be stored in a
single file in flash memory. The prerecorded tones (raw data PCM or L8 files) are prepared
offline using standard recording utilities (such as CoolEdit
TM
) and combined into a single
file using the TrunkPack Downloadable Conversion utility (refer to Section E.1.4 on page
399).
The raw data files must be recorded with the following characteristics:
 Coders: G.711 A-law or G.711 µ-law
 Rate: 8 kHz
 Resolution: 8-bit
 Channels: mono
The generated PRT file can then be loaded to the Mediant 1000 using the BootP/TFTP
utility (refer to Section 5.8.2.2 on page 191) or via the Embedded Web Server (Section
5.8.2 on page 189).
The prerecorded tones are played repeatedly. This enables you to record only part of the
tone and play it for the full duration. For example, if a tone has a cadence of 2 seconds on
and 4 seconds off, the recorded file should contain only these 6 seconds. The PRT module
repeatedly plays this cadence for the configured duration. Similarly, a continuous tone can
be played by repeating only part of it.
16.3 CAS Protocol Configuration Files
The CAS Protocol Configuration Files contain the CAS Protocol definitions that are used
for CAS-terminated trunks. You can either use the supplied files or construct your own files.
It is possible to load up to eight files and to use different files for different trunks.
Note: All CAS files loaded together must belong to the same Trunk Type (either
E1 or T1).
16.4 The Coefficient Configuration File
The Coeff_FXS.dat file is used to provide best termination and transmission quality
adaptation for different line types for FXS modules. This adaptation is performed by
modifying the telephony interface characteristics (such as DC and AC impedance, feeding
current and ringing voltage).
The coeff.dat configuration 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 and40 V RMS ringing voltage
for REN = 2.
To load the coeff.dat file to the Mediant 1000, use the Embedded Web Server (refer to
Section 5.8.2 on page 189) or alternatively specify the FXS coeff.dat file name in the
gateway’s ini file (refer to Section 5.8.2.2 on page 191).
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