AudioCodes Mediant 500 MSBR, Руководство пользователя

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Version 7.2 613 Mediant 500 MSBR
User's Manual 31. Analog Gateway
Parameter Description
is defined at Index #9, you need to configure the 'Priority Index'
parameter to "1" and the FirstCallWaitingToneID parameter to "8". The
summation of these values is 9 (1 + 8).
The default is 0.
To configure the CPT file, see Call Progress Tones File on page 773.
31.12 FXS/FXO Coefficient Types
The device can use the following FXS Coefficient and FXO Coefficient types:

FXS:
•
USA line type: 600 ohm AC impedance and 40 V RMS ringing voltage for ringer
equivalence number (REN) of 3
•
European standard (TBR21)

FXO:
•
REN: 0.5
•
USA line type: 600 ohm AC impedance
•
European standard (TBR21)
The Coefficient types increase return loss and trans-hybrid loss performance for two
telephony line type interfaces (US or European). The 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. The 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

To select the FXO and FXS Coefficient types:
1. Open the Analog Settings page ( Setup menu > Signaling & Media tab > Gateway
folder > Analog Gateway > Analog Settings ).
Figure 31-10: Configuring FXS/FXO Coefficient Types