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Word Count: 543
Jitter is variability in latency or delay Jitter is also the tendency towards lack of synchronization caused by mechanical or electrical changes It is the phase shift of digital pulses over a transmission medium Newtons Telecom Dictionary 18th Ed In lemans terms jitter is the short term shaky pulses or slight movement in time or phase that can introduce errors and loss of synchronization on an amplitude modulated signal If there is jitter on a transmitted signal it could lead to the degradation in system error performance slips in the timing of a circuit which would lead to errors on the circuit and the distortion of the analog signal after the decoding or the digital signal has taken place There are several different causes for jitter One reason for jitter could come from the conversion from analog to a digital signal or vice versa If the timing on a circuit and on the equipment that does the conversion of A to D and D to A is not properly matched and in sync the circuit could take errors and cause jitter Clocking and where clocking comes from could cause jitter For example if the 5ESS provides the master clocking on a T-1 line for a customer the customers PBX must slave timing or accept the timing from the 5ESS The PBX must do all of the clocking needed from the master source If the PBX was set up to be the master and the 5ESS was also the master there would be clocking errors causing jitter on the circuit Another cause of jitter can come from bad or faulty cabling If copper cabling is not properly run secured and tested the copper can pick up errors by way of noise power fluctuations bad weather and interference thus causing jitter Jitter can also come from asynchronous multiplexers eg the M13 MUX because of the bit-stuffing and the extraction of bits Wander is the long-term phase
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