Commit 63941781 authored by Matteo Quintiliani's avatar Matteo Quintiliani

Improved descriptions about Data on Demand DOD


git-svn-id: file:///home/quintiliani/svncopy/nmxptool/trunk@1138 3cd66e75-5955-46cb-a940-c26e5fc5497d
parent a12fb154
......@@ -167,7 +167,7 @@ thanks[revision]{
\backslash
small
\backslash
itshape CVS $ $Revision: 1.36 $ $ -- $ $Date: 2008-08-20 13:56:35 $ $}
itshape CVS $ $Revision: 1.37 $ $ -- $ $Date: 2008-08-20 15:31:34 $ $}
\end_layout
\end_inset
......@@ -650,6 +650,58 @@ name "fig:maxtolerablelatency"
Data On Demand
\end_layout
\begin_layout Standard
A remote seismic station could be configured not for sending data in real-time
to the NaqsServer but for receiving request of data by channel and time
period and then respond to the retransmission requests.
A software to make this kind of requests is called DataOnDemand and provided
by
\begin_inset LatexCommand citet
key "nanometricsdod"
\end_inset
.
\end_layout
\begin_layout Standard
If your aim is retrieving data-on-demand with minimum delay after the request
and redirect it into a Seedlink or Earthworm then you can use nmxptool
because it has been also designed to do that.
nmxptool is listening to the packets which are chronologically ordered
when they are flowing.
The buffer of the packets is flushed after a time-out of inactivity in
input.
\end_layout
\begin_layout Standard
\begin_inset Note Note
status open
\begin_layout Standard
Data on Demand (DoD) Version 1.02 provides options to request waveform data
by channel and time period from remote Cygnus or Janus comms devices, for
transmission to a specified NAQS Server.
The comms device collects data in ringbuffers at the remote site and will
respond to retransmission requests, but continuous real-time data are not
sent to the central site for channels set to Demand.
\end_layout
\begin_layout Standard
Using DoD you can select data of interest by time period from the remote
ringbuffer for channels set to Demand.
These requests may include future data.
The selected data are then transmitted to the central site NAQS Server.
You can use DoD manually via the graphical user interface (GUI) or the
command line interface (CLI), or automatically by invoking the CLI via
scripts in conjunction with user-provided event detection software.
\end_layout
\end_inset
\end_layout
\begin_layout Standard
TODO: DataOnDemand figure and descriptions.
\end_layout
......@@ -668,16 +720,6 @@ TODO: DataOnDemand figure and descriptions.
packet is 33, that is 1 + 32
\end_layout
\begin_layout Standard
nmxptool and libnmxp have been also designed to retrieve with minimum delay
the data requested by the java application DataOnDemand developed by Nanometric
s.
nmxptool is listening to the packets which are chronologically ordered
when they are flowing.
These packets are flushed only after a time-out of inactivity, that is
after a time-out.
\end_layout
\begin_layout Subsection
Data continuity after disconnection
\end_layout
......
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