Timing must be consistent between elements in a VoIP topology. Sourcing the SBC Edge clock is critical in keeping the SBC Edge synchronized with other elements of the topology. The SBC Edge may obtain its clock from a network (T1/E1) source such as a PBX or Central Office, or it may use its own internal clock which may itself by synchronized to an NTP source. Where the clock source originates depends entirely on the topology itself and varies on a case-by-case basis.
Configuring System Timing
To configure system timing using a network clock source:
- In the WebUI, click the Settings tab.
In the left navigation pane, go to System > System Timing.
Configure System Timing
Configuration - Field Definitions
Clock Source
Specifies the source of the systems transmit clock.
- System: The built-in oscillator is used to transmit data over synchronous links. The system's internal clock can be modified by the system administrator, see Configuring the System Date and Time.
- Network: The clock is derived from the data received from the peer devices on the network.
Primary Clock Port
Specifies the DS1 port from which the clock will be derived. This field is visible only if Network is specified as the Clock Source.
Secondary Clock Port
Specifies the DS1 port from which the clock will be derived. This field is visible only if Network is specified as the Clock Source.
The Secondary Clock Source is used only if the primary clock source is not of sufficient quality or becomes unavailable.
Overview
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