Network Home | Current Performance | Network Latency | Network Loss | Averages | Methodology | >Glossary
 
 

Distance-Sensitive Thresholds
Because the latency across the network is dependent on the distance the packets have to travel, our thresholds
are set to be distance sensitive (based on the speed of light in fiber).
The distances used are direct (crow-flies) miles.

Modem Connect Success Rate
It is the ability of the user client's dialup modem and the network modem to connect at any modem speed.
The current average for Modem Connect Success Rate shown on the front page of the site are averaged
over 24 hours over all Points of Presence (PoPs).

Network Reliabilty
This is the overall availability of the network averaged over the month.

Network Jitter
Network Jitter or delay variation is a measure of the variablility for a series of one-way latency measurements.

Previous Month's Averages
These are the averages for each of the previous three months over all city-pairs for round trip delay and loss.
We also present the backbone availability for the mont
h.

Roundtrip Latency
Latency (or delay) is the round-trip time for a small data packet to travel between two end points (source
and destination city-pairs) in the network. Latency affects one's perception of the response time of the network.
City-pair latency statistics are updated every 15 minutes. The current average for Continental U.S. Network
connections shown on the home page of the site is the average over all relevant city-pair latency values
for the current 15-minute update. When data is unavailable, no value is shown.

Roundtrip Loss
Loss is the percentage of packets lost in a data transaction. The opposite of loss, data delivery is defined
as 100 minus the percentage of packet loss and is the percentage of successfully delivered packets.
The measurement is a round trip one, made by counting the packets sent between two cities that do
not return. City-pair loss statistics are updated every 15 minutes. The current average for Network Loss,
shown on the home page of the site is the average over all relevant city-pair loss percentages for
the current 15-minute update. When data is unavailable, no value is shown.




     


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