StarNet Analyzer (SNA)
The StarNet Analyzer, or SNA, is a Java applet that runs onsite for a minimum of 48 hours (business hours) testing the customers Internet connection. We measure several items, including speed, packet loss, jitter, round trip times, which provides you with a graded report card that will also display MoS scoring. The SNA collects several metrics that are critical to voice over IP communications and is therefore a mandatory test for all installations.
What does the SNA measure?
- Upstream Bandwidth
- Downstream Bandwidth
- Round Trip Time
- Upstream Variance
- Downstream Variance
- Number of Connection Points (Hops)
- Route Delay
What do the results look like?
Up Jitter / Down Jitter Up Loss / Down Loss
MOS Up Speed / Down Speed
- Excellent = Always under 10ms.
- Quality = Stays under 10-25ms about 90% of the time.
- Poor = There are multiple instances of jitter with some rising above 30 - 50 ms or higher.
- Packet Loss
- Excellent = No packet loss
- Quality = Some packet loss, but there are a small number of instances, and they do not go above 3%.
- Poor = Any consistent packet loss above 3%.
- To figure out the minimum amount of bandwidth required for a circuit, follow this formula: (Number of lines x 32K) + 100. So, three lines needs 196K, since 32 x 3 = 96, then 96 + 100 = 196K. The 100K is due to the data requirement, so if a circuit is just voice, just use the line multiplication part of the formula.
- Excellent = There is more than enough speed for the amount of lines needed, and the service is very stable.
- Quality = Still enough speed for the lines needed, but service is unstable and has some drops.
- Poor = Bandwidth consistently drops below the minimum required bandwidth once or twice.
- Round Trip Time
- Excellent = Pings lower than or around 40ms consistently with very little to no spikes.
- Quality = Pings under 70ms with small spikes.
- Poor = Any circuit with pings higher than 70ms, or multiple spikes with high latency.
Help with enabling the SNA test
The following guides provide configuration steps for allowing the SNA test through the most common types of Antivirus and Firewall software.