| Term |
Definition |
| Jabber |
Term used with Ethernet to describe the act of continuously sending data. A jabbering station is one whose circuitry or logic has failed, and which has locked up a network channel with its incessant transmission. |
| J-carrier System |
A transmission system carrying 12 telephone channels which uses frequencies up to 140kHz. |
| JEDEC |
Joint Electronic Device Engineering Council. |
| Jitter |
Short-term variations of the significant instants of a digital signal from their ideal positions in time. Regardless of the stability of clocks at both ends of a digital transmission system, certain amounts of instability occur in the received signal because of external electrical disturbances and changing physical parameters of the transmission link. |
| Jitter Buffers |
A hardware buffer that is used to remove jitter from an incoming stream. The buffer size is important in that it has to be big enough to ensure that no packets are lost due to late packets and that has to be small enough to minimize the latency in the system. |
| Jitter Tolerance |
A measure of the ability of the PLL to operate properly (remain locked and/or regain lock in the presence of large jitter magnitude/frequencies) when jitter is applied to its reference. |
| Jitter Transfer |
The magnitude of the jitter at the output of a device for a given amount of jitter at the input of a device. |
| Joint |
Any joining or mating of a fiber by splicing, both by fusion and by physical contact, or by connecting. |
| JTAG |
Joint Test Action Group. |
| Jumper Cable Assembly |
An electrical or optical assembly consisting of a pair of transmission lines terminated at their ends with a plug connectors. |
