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:
|
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. |