Version 7.0 433 Mediant 3000
User's Manual 22. Digital PSTN
22.2.3 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 962.
To configure the device's system timing:
1. Open the System Timing page (Configuration tab > VoIP menu > TDM & Timing >
System Timing).
Figure 22-4: System Timing Page
2. Configure the parameters as required.
3. Click Submit.
4. Save the changes to flash memory, see ''Saving Configuration'' on page 672.
22.2.4 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 434)
BITS synchronization (see Configuring BITS Synchronization Mode on page 435)
Internal clock (see ''Configuring Internal Clock as Clock Source'' on page 436)
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