timestamp

Required Command-Line Mode = Configure

GigaVUE H Series nodes with the HCCv2 control card installed can take advantage of external PPS normalization for PTP/NTP timestamps applied using the PRT-H00-X12TS line card.

Use the timestamp command to select the input on the HCCv2 control card used for the external PPS source leader in a bidirectional clock relationship (formerly master) and, if necessary, configure an offset for the PPS source. The system automatically uses its internal PPS source until an external source is selected using the timestamp command.

Note:  The PPS source is used together with the configured PTP or NTP time source. The PTP/NTP source is used to set the time of day for the PRT-H00-X12TS line card (essentially the seconds value for the timestamp)—the PPS source refines and normalizes the timestamps applied.

This command does not apply to GigaVUE TA Series nodes.

The timestamp command has the following syntax:

timestamp
   pps-offset <1-280ns>
   pps-source <ext-coaxial | ext-rs232 | ext-rs485>

The following table describes the arguments for the timestamp command:

Argument	Description
pps-offset <1-280ns>	Specifies an offset from the PPS source, if necessary, from 1 to 280 nanoseconds. The default is 0. The PRT-H00-X12TS line card uses the connected PPS source as-is with no offset adjustment. For example: (config) # timestamp pps-offset 10
pps-source <ext-coaxial | ext-rs232 | ext-rs485>	Specifies the timestamp source. Each of the values corresponds to a connector on the HCCv2 control card as follows: ● ext-coaxial—The PPS source is connected to the coaxial PPS (In) connector. ● ext-rs232—An RS-232 PPS source is connected to the RJ45 PPS (In) connector. ● ext-rs485—An RS-485 PPS source is connected to the RJ45 PPS (In) connector. For example: (config) # timestamp pps-source ext-coaxial

Connecting an External Pulse-Per-Second Source

Refer to the Hardware Installation Guide for details on the electrical requirements and pinouts for connecting a PPS source.

Pulse-Per-Second Failover

The system automatically uses its internal PPS source until an external source is selected using the timestamp command. In addition, the system automatically fails over to its internal PPS source if the timestamp command is used to select an external source but a valid signal is not present on the selected external input.

Related Commands

The following table summarizes other commands related to the timestamp command:

Task	Command
Displays time and PPS source.	# show timestamp
Displays timestamp information for a specified box.	# show timestamp box-id 1