Input Port Status


The TimeHub provides four input ports or eight ports if an optional Clock card is installed to provide four additional outputs. The Input Port Status screen shown below provides a view of the port settings described in the following table. Click Edit to change the settings.

Item

Description

Input

Indicates the port number.

State

Indicates if the port is enabled or disabled as an input timing reference.

Expected State

Indicates if the port's expected state as an input timing reference is enabled or disabled.

Status

Displays one of the following port status indications:

  • ACTIVE

  • QUALIFIED

  • NOT QUALIFIED

  • INPUT LOS

  • IMPAIRMENT

  • DISABLED

Priority

Displays the priority setting (0 through 9). The priority setting provides a way to prefer a particular input for use as the active timing reference when more than one input has been qualified. The lower the number, the higher the priority. The default is that the PRS input has highest priority and all others are equal.

Frame Type

Displays the port's frame type setting (ESF or D4).

Read SSM

Indicates if the input is enabled or disabled to use SSM messages as part of the input qualification process.

Note: D4-framed DS1 inputs do not allow the Read SSM selection since they are not capable of SSM decoding.

Current SSM

Displays the ports current SSM.

Monitor

Indicates if port monitoring is enabled or disabled.

Note: Port monitoring can be enabled even if the port is not enabled as a timing reference.

Bridged Input

If the reference signal on this port is bridged and not terminated, the bridged input setting should be set to ENABLE.

Note: If a reference signal is bridged, it will be nominally 20 dB lower in amplitude than a signal that is terminated at the input.