AudioCodes Mediant 3000, Руководство пользователя

Страница: 301 / 872

Version 6.6 301 Mediant 3000
User's Manual 21. Digital PSTN
21.2.3 Configuring System Timing
The System Timing page allows you to configure the device's clock synchronization
mechanism. For a description of these parameters, see 'PSTN Parameters' on page
766 .

To configure the device's system timing:
1. Open the System Timing page ( Configuration tab > VoIP menu > TDM & Timing
submenu > System Timing ).
Figure 21-4: System Timing Page
2. Configure the parameters as required.
3. Click Submit to apply your changes.
4. Save the changes to flash memory, see 'Saving Configuration' on page 520 .
21.2.4 Clock Settings
In a traditional TDM service network such as PSTN, both ends of the TDM connection must
be synchronized. If synchronization is not achieved, voice frames are either dropped (to
prevent a buffer overflow condition) or inserted (to prevent an underflow condition). In both
cases, connection quality and reliability is affected.

PSTN line clock (see 'Recovering Clock from PSTN Line' on page 302 )

BITS synchronization (see Configuring BITS Synchronization Mode on page 303 )

Internal clock (see 'Configuring Internal Clock as Clock Source' on page 304 )
Note: When the device is used in a ‘non-span’ configuration, the internal device
clock must be used (as explained above).