Ive just ran jperf (frontend to iperf) on our network between 2 workstations, its recorded jitter between 0.033ms and 0.048ms. Is this good or bad? Are there more variables that i would need to consider to make the decision?EDIT:TCP/IP Ethernet LAN 43 PCs 1 server, 100Mbits main switch, various small 8 port switches, test was done using UDP, Its a Windows Domain.I want to instal a few voip softphones on the workstations, see how many i can use that reliably work, im testing a few different workstations around the network to see where the best quality network paths are. Will also change some equipment if i identify bad connections.
Phase jitter: Phase jitter is the term used for looking at the phase fluctuations themselves, i.e. The deviations in the position of the phase against what would be expected from a pure signal at any given time. Accordingly phase jitter is measured in radians.
A quick back-of-my hand calculation gives the following data:100 mbit bit rate is 100 000 000 bits/second (network, so not 1024)A full length ethernet frame is 1518 bytes, 12 144 bits.Transfer of a full packet takes 00000 seconds, around 0.12 ms.A minimum length ethernet frame is 64 byes, 512 bits.Transfer of a minimal packet takes 500 seconds, around 0.005 ms.So the whole jitter can be explained with a single packet in queue at one of the switches. In practice you should be more interested in the distribution of jitter than single outliers. To get this data you need to do a lot more measurements. If this is your maximum latency you observe you are doing as well as Ethernet can.For VoIP a maximum latency under 10 ms will place you easily in MOS 5. People start complaining around 50-100ms. Above 100ms it's significantly degraded.
![What is jitterbug phone What is jitterbug phone](/uploads/1/2/5/4/125485994/321794033.jpg)
For grading of voice quality have a look at.
The jitter itself is a stutter in the timing of the card draw. This means that when an accepts the card you insert, the machine does not take in the card at a steady pace, and may instead stop-and-start the scan. Many skimming devices require a smooth swipe in order to properly skim the numbers. Jitter technology does not work well in machines that allow an individual to dip in a credit or debit card manually.
This type of swipe feature is typically found in older ATMs, but can also be found in more modern machines.