Symptoms: Internet access jitter. Responses between the local domain and the internet are irregular.
Impact: Medium
Internet jitter can also lead to complete halts in user functions that depend on external processes via the internet ( for example credit card authorization, credit checking, blockchain operation, etc. ) or where the local domain intranet is being accessed by mobile devices (phone/tablet/wifi, etc). See also internet latency.
Threshold settings:
Metrics are set in milliseconds over a specified time span. Default settings are:
| CRITICAL : | ||
| MEDIUM : | 50ms | |
| LOW : | 20ms | |
| Timespan : | more than 5 minutes |
Expected behavior :
There is no standard metric for jitter. Many aspects of the environment will affect jitter.
Reliable connections consistently report back the same latency over and over again. Using AimBetter’s algorithm, the alert displays when average internet latency deviates more than the threshold level for longer than the designated time window.
Possible causes of internet latency
Inaccessible target Priority: High
There is an extremely low probability of such a universal website becoming inaccessible as a source. The first check is to see whether the same target can be reached from a different testing point in another domain.
Recommended action :
Identify the viability of the target website. If not accessible externally then this is not able to be addressed by any local action. If the website can be accessed, then follow the steps below.
ISP errors Priority: High
Recommended action :
Network errors or inefficient network structure Priority: Medium
Recommended action :
Investigate all hardware components, with your Network Management team.
See our recommendations regarding network levels here.
Background
Jitter in IP networks is the variation in the latency on a packet flow between two systems when some packets take longer to travel from one system to the other. Jitter results from network congestion, timing drift, and route changes.
Among the causes of jitter are electromagnetic interference (EMI) and crosstalk with other signals. Jitter can affect the ability of the processor in a desktop or server to perform as intended, causing loss of transmitted data between network devices. The amount of allowable jitter is highly dependent on the application.
This alerts reports on the variance in latency time for accessing a reliable external web site (in the current version, we use Google.com).
