AudioCodes MediaPack MP-112, Руководство пользователя

Страница: 274 / 622

User's Manual 274 Document #: LTRT-65417
MP-11x & MP-124
3. Configure the table as required. For a description of the parameters, see the table
below.
4. Click Submit to apply your changes.
Table 25-8: Tone index Table Parameter Description
Parameter Description
Index Defines the table index entry. Up to 50 entries can be defined.
FXS Port First
[ToneIndex_FXSPort_First]
Defines the first port in the FXS port range.
FXS Port Last
[ToneIndex_FXSPort_Last]
Defines the last port in the FXS port range.
Source Prefix
[ToneIndex_SourcePrefix]
Defines the prefix of the calling number.
Destination Prefix
[ToneIndex_DestinationPrefix]
Defines the prefix of the called number.
Priority Index
[ToneIndex_PriorityIndex]
Defines the index of the distinctive ringing and call waiting tones.
The call waiting tone index equals to the Priority Index plus the
value of the FirstCallWaitingToneID parameter. For example, if you
want to use the call waiting tone in the CPT file at Index #9, you
need to enter "1" as the Priority Index value and set the
FirstCallWaitingToneID parameter to "8". The summation of these
values is 9, i.e., index #9.
The default value is 0.
25.13 FXS/FXO Coefficient Types
The FXS Coefficient and FXO Coefficient types used by the device can be one of the
following:

US line type of 600 ohm AC impedance and 40 V RMS ringing voltage for REN = 2

European standard (TBR21)
These Coefficient types are used to increase return loss and trans-hybrid loss performance
for two telephony line type interfaces (US or European). This adaptation is performed by
modifying the telephony interface characteristics. 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.
The FXS Coefficient types provide best termination and transmission quality adaptation for
two FXS line type interfaces. This parameter affects 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