Jitter Measurement with Hardware Timestamping

Jitter is the difference in relative transit time between two consecutive probes.

You can timestamp the following RPM probes to improve the measurement of latency or jitter:

• ICMP ping
• ICMP ping timestamp
• UDP ping
• UDP ping timestamp

Note: The Services Router supports hardware timestamping of UDP ping and UDP ping timestamp RPM probes only if the destination port is UDP-ECHO (port 7).

Timestamping takes place during the forwarding process of the Services Router originating the probe (the RPM client), but not on the remote router that is the target of the probe (the RPM server).

The supported encapsulations on a Services Router for timestamping are Ethernet including VLAN, synchronous PPP, and Frame Relay. The only logical interface supported is an lt services interface.