<div class="csl-bib-body">
<div class="csl-entry">Schossmaier, K. (1998). <i>Interval-based clock state and rate synchronization</i> [Dissertation, Technische Universität Wien]. reposiTUm. https://resolver.obvsg.at/urn:nbn:at:at-ubtuw:1-12842</div>
</div>
Local time can be observed at nodes in a distributed system by using their clocks, whose state and rate are required to be in sync with each other (internal clock synchronization) and related to UTC (external clock synchronization) as well. The synchrony in the 1 #mu#second-range with commercial-off-the-shelf technology is accomplished by running distributed algorithms, which have to cope with uncertainties arising from varying packet transmission delays, clock drifts, non-zero granularities, and system faults. Unlike traditional approaches, we establish accuracy/precision resp. rate/consonance intervals along with suitable operations to capture the state resp. rate of clocks. We introduce the notion of internal global time/rate for the worst case analysis. Of particular interest are interval-based convergence functions with fault-tolerance properties to compute proper adjustments. Our research reveals that clock granularities and discrete rate adjustment techniques have a considerable impact upon the achievable state synchronization, and that the oscillator stability is essentially responsible for the achievable rate synchronization. Apart from advanced algorithmic matters, some hardware support for exact timestamping is required in conjunction with 4 high-resolution clock device with fine- grained state and rate adjustment capabilities. Those features are provided by an M-Module (called NTI) built around an ASIC (called UTCSU).
en
dc.language
English
-
dc.language.iso
en
-
dc.rights.uri
http://rightsstatements.org/vocab/InC/1.0/
-
dc.subject
Verteiltes System
de
dc.subject
Uhr
de
dc.subject
Synchronisierung
de
dc.title
Interval-based clock state and rate synchronization