ProfiShark Manager — Timing

The Timing tab displays settings and information related to the advanced timestamping features.

Control
Timestamp initialization	Sets the source for timestamping at startup: GPS / RTC / System time. If “Do not initialize” is selected, it will start from Epoch 0 (1970).
Wait for sync	If enabled, traffic capture is only allowed after timestamp synchronization has been completed.
PPS port output	If enabled, the PPS port will be set to output mode, sending out a PPS signal if the GPS is synchronized.
Force PPS generation	Forces the generation of a PPS signal from the internal RTC (real-time clock). Note: Only active if PPS port output is also enabled.
Set time from SNTP/GPS	Sets the source for timestamping to either GPS or an online time service (SNTP).
PPS compensation	The PPS compensation slider tells the PPS to compensate for additional (external) latency. For instance, 1 meter of cable adds 3 ns of latency, in which case the slider should be set to -3 ns (-15 ns for 5 meters, -30 ns for 10 meters, etc.).
Timestamp on Port A/B	Capture: Timestamps are set to the packets at the moment they are captured within the device. Ingress: Timestamps are adjusted to account for latency to simulate timestamping at port ingress. Egress: Timestamps are adjusted to account for latency to simulate timestamping at port egress. Example: Set one port to egress on a first ProfiShark and one to ingress on a second ProfiShark to measure the latency between both ports.

Status
GPS module detected	If green, the GPS antenna has been detected by the ProfiShark.
GPS fix	If green, the GPS connection is stable. If yellow, the GPS connection is close to being stable.
GPS PPS	If green, the GPS link is stable enough for the PPS chip to start the synchronization.
External PPS	If green, an external PPS is detected, bypassing the internal PPS. If red, no external PPS has been detected.
Timestamp initialized	Indicates the method by which the time data has been obtained: GPS, SNTP, System clock, or RTC.
Timestamp synced	Indicates that the internal timestamping is synchronized with the UTC time.
Satellites status	Indicates the number of GPS and GLONASS satellites found in range, and the number of satellites used for timestamping.
Deviation from PPS	Indicates the instant deviation of the GPS synchronization from the internal PPS.
Graph	The graph section displays the GPS synchronization status and its deviation from the internal PPS over time.