latency


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latency

[′lat·ən·sē]
(computer science)
The waiting time between the order to read/write some information from/to a specified place and the beginning of the data-read/write operation.
(medicine)
The stage of an infectious disease, other than the incubation period, in which there are neither clinical signs nor symptoms.
(physiology)
The period between the introduction of and the response to a stimulus.
(psychology)
The phase between the Oedipal period and adolescence, characterized by an apparent cessation of psychosexual development.

latency

(communications)
1. The time it takes for a packet to cross a network connection, from sender to receiver.

2. The period of time that a frame is held by a network device before it is forwarded.

Two of the most important parameters of a communications channel are its latency, which should be low, and its bandwidth, which should be high. Latency is particularly important for a synchronous protocol where each packet must be acknowledged before the next can be transmitted.

latency

(1) Essentially any delay or lapse in time. In general, it is the time between initiating a request in the computer and receiving the answer. Data latency may refer to the time between a query and the results arriving at the screen or the time between initiating a transaction that modifies one or more databases and its completion.

Disk latency is the time it takes for the selected sector to be positioned under the read/write head. Channel latency is the time it takes for a computer channel to become unoccupied in order to transfer data. Network latency is the delay introduced when a packet is momentarily stored, analyzed and then forwarded.

(2) With malicious software, latency is the period between infection and the first obvious damage to the host system. Many viruses or logic bombs written by amateurs have a short latency and are therefore relatively easy to detect; however, more vicious malware can lie dormant or replicate to many other hosts and then wreak havoc unexpectedly. See logic bomb and virus.
References in periodicals archive ?
To differentiate themselves and compete on a more equal footing with the incumbents, OTT providers must fix the home experience and take advantage of technological advancements to achieve lower latency delivery.
[11] observed that latency of wave III and wave V was delayed, which was highly significant in individuals with T2DM.
With increasing arm length, APB LLR latency increases and its amplitude decreases.
Residual latency >2.37 msec showed a sensitivity of 0.897, a specificity of 0.818, a PPV of 0.955, and a NPV of 0.647.
We had lawyers reviewing the ways courts interpreted the occurrence trigger, bioscientists describing the latency of various diseases from autism to cancer and quants pulling it all together into models." (See also, related article, "(http://carriermag.com/8dswt) Meet the Modeler: Praedicat's Boudreau Takes the Road Less Traveled for Actuaries")
According to the values obtained from CTS patients and control subjects, there were significant differences in the median motor distal latency (MDL), median minimum F responses, L-I, M-U, M-R, digit I, II, III and palm-wrist (median nerve) latencies, amplitudes, and conduction velocities (p<0.0001) (Table 1).
However, the effective collaboration in VEs is strongly affected by the network latency. In CVEs, as the users are geographically distributed, a considerable amount of latency occurs in the collaborative work.
By solving the scalability and latency issues caused by live unicast streaming, nanoCDN enables operators to mutualize their head-end, rely on cost-effective Android STBs, and extend their eligibility by supporting ABR streaming for all screens, the company notes.
Also, it was found that there was a statistically significant positive and weak correlation between diabetes duration and N135 latency in 15-minute check size (R = 0.330, p = 0.011).
For each of these scenarios, the end-to-end latency threshold must remain very low to ensure that interactions are fluid and video content is delivered in a timely manner.
The unmatched latency and flexibility of Hibernia Networks' Ultra Low Latency service empowers IPC with the network performance needed to meet the dynamic requirements of our customers and the fast-moving global financial market ecosystem.