General


Use the Timing > General subtab to provision the general timing parameters.

Item

Description

Timing Mode

Sets the node timing mode:

  • External: The ONS node derives its timing from the building integrated timing supply (BITS) pins on the MIC-C/T/P coaxial connectors.

  • Line: Timing is derived from an STM-N card or OSC card (in DWDM nodes) that is optically connected to the timing node.

  • Mixed: Timing is set to external and line timing references.

Revertive

If checked, the ONS node reverts to a primary reference source after the conditions that caused it to switch to a secondary timing reference are corrected.

Reversion Time

If Revertive is checked, indicates the amount of time the ONS node will wait before reverting to its primary timing source. Five minutes is the default.

Reference Lists

Defines the node's timing references (Ref 1, Ref 2, Ref 3). The node uses Reference 1 unless a failure occurs to that reference or its quality degrades, in which case the node uses Reference 2. If Reference 2 fails, the node uses Reference 3, which is typically set to Internal Clock (the Stratum 3 clock provided on the TCC2/TCC2P card). The options that appear depend on the Timing Mode setting.

  • If the Timing Mode is set to External, options are BITS-1, BITS-2, and Internal Clock.

  • If the Timing Mode is set to Line, options are the node's working STM-N cards (non-DWDM nodes) or OSC cards (DWDM nodes) and Internal Clock.

  • If the Timing Mode is set to Mixed, both BITS and STM-N cards are available.

  • BITS-1 Out/BITS-2 Out: Sets the timing references for equipment connected to the BITS Out MIC-C/T/P pins. BITS-1 Out and BITS-2 Out are enabled when BITS-1 and BITS-2 facilities are put in service.

Apply

Applies changes to the Timing > General subtab.

Reset

Cancels Timing > General subtab changes and returns the fields to their last-saved settings.

Help

Displays context-sensitive help.