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List of netowrking, wireless, broadband, satellite, telephony, general computing and other technical terms used throughout the site.
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| Term |
Description |
| jabber |
jabber is a Ethernet frame greater than the maximum of 1518 bytes with a bad CRC. Often indicative of a hardware problem with a NIC or transceiver.
See also: runt |
| JBOD |
JBOD (Just a Bunch Of Disks, a.k.a spanning) refers to hard disks that can be combined to act as a single larger volume. It is not a RAID configuration.
For example, a 20 GB and a 60 GB drive can be combined to make a 80 GB JBOD volume. |
| jitter |
jitter (in the context of computer networks) is a measure of the variance of latency (pings) accross the network. Jitter in a network can be measured using the time variation in successive pings. The jitter (packet delay variation) is the amount by which pings vary.
Zero jitter in a network means that all pings to a host are exactly the same every time. While some jitter should be expected over the Internet, a lower jitter value is better, having it be a small fraction of the ping result is ideal.
In general, jitter is a significant, and usually undesired factor in the design of almost all communications links (e.g. USB, SATA, as well as all network/internet connections).
Jitter buffers or de-jitter buffers are used to counter jitter introduced by queuing in packet switched networks so that a continuous playout of audio or video transmitted over the network can be ensured. This works, however the buffer adds delay, and is finite in size (if it gets full packets will get discarded). |
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