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-README About the Usage of ODR-DabMod for
-Synchronous Transmissions
-========================================
-
-Summary
--------
-ODR-DabMux and ODR-DabMod have a basic support for timestamped transmission,
-when the UHD output is used.  This README explains how this functionality
-works, and how to set it up.
-
-This feature is a prerequisite for the creation of a single-frequency
-network.
-
-
-Concept
--------
-The goal of this functionality is to synchronise the transmission for
-several transmitters.  This has been tested with the USRP B100 and the
-USRP2, that both have the necessary REFCLK and 1PPS inputs.  Both are
-required to synchronise two USRPs:
-- The REFCLK is used in the USRP for timekeeping.  If we want two
-  USRPs to stay synchronised, they both must have a precise 10MHz
-  source at the REFCLK, otherwise their internal clocks will drift
-  off.
-- The 1PPS signal is used to set the time inside the USRPs.  The rising
-  edge of the 1PPS signal has happen synchronously for all transmitters.
-  Usually, GPS is used to drive this 1PPS.
-
-For such a system, there will be one multiplexer, which will send the ETI
-stream to several modulators. The ETI stream, in this case, is transported
-over a TCP/IP.
-
-Each modulator receives ETI frames that contain absolute timestamps, defining
-the exact point in time when the frame has to be transmitted.  These in-band
-timestamps are composed of two parts:
-- The TIST field as defined in the ETI standard, giving an offset after the
-  pulse per second signal;
-- A time information transmitted using the MNSC, representing the precise time
-  when the frame must be transmitted, with one-second resolution.
-
-When ODR-DabMux is called with -s, the TIST is defined in each frame. The
-Time is always encoded in the MNSC.
-
-When the ETI stream is sent to several modulators using non-blocking I/O, it
-is not possible to rely on a modulator to back-pressure the Ensemble multiplexer.
-It is therefore necessary to throttle multiplexer output.  ODR-DabMux takes an
-additional parameter -r to output one ETI frame every 24ms.
-
-The tool eti_tcp.py can be used to send the ETI stream over TCP.
-An example invocation is:
-odr-dabmux <lots of options> | ./eti_tcp/eti_tcp.py 54540
-
-Each modulator then receives the ETI stream through a TCP connection. Each frame
-contains the complete timestamp, to which an per-modulator offset is added.
-The sum is then given to the USRP. The offset can be specified in two ways:
-
-using -o delay:
-Adds a constant delay specified on the command line (see example 1 below).
-
-using -O delayfile
-Adds the delay specified in the given file. The file must contains a single
-line containing a floating point number. This file is read each 50 frames, and
-the modulator delay is updated.
-
-In both cases, the units are seconds.
-
-Example modulator invocation (for a B100 USRP supporting 2048Msps and with a
-fixed delay of 2.3 seconds)
-nc localhost 54001 | odr-dabmod /dev/stdin -g2 \
-   -o 2.3 -l -u "master_clock_rate=32768000,type=b100" -F 234208000
-
-Example modulator invocation (for an USRP2 requiring resampling and with a delay
-specified in a separate file "moddelay")
-nc localhost 54001 | odr-dabmod /dev/stdin -g2 \
-    -O moddelay -l -r 4000000 -u "type=usrp2" -F 234208000
-
-ODR-DabMod uses the UHD library to output modulated samples to the USRP device.
-When started, it defines the USRP time using the local time and the PPS signal.
-It is therefore important to synchronise computer time using NTP.
-
-When a frame arrives with a timestamp that is in the past, the frame is dropped.
-If the timestamp is too far in the future, the output module waits a short
-delay.
-
-Synchonisation can be verified by using an oscilloscope and a receiver. It is
-very easy to see if the null symbols align.
-
-
-Hardware requirements
----------------------
-The following hardware is required to test the SFN patch to the CRC mmbTools:
-- Two USRPs ;
-- One or two computers with the mmbTools installed ;
-- A network connection between the two computers ;
-- A 10MHz refclk source ;
-- A 1PPS source synchronised to the 10MHz ;
-- An oscilloscope to check synchronisation.
-
-When more than one USRP is plugged to one computer, the device string for the
--u option for ODR-DabMod must specify the device. (e.g.  -u "type=b100",
--u "type=usrp2" or -u "serial=ABC123")
-
-It is possible to use signal generators as REFCLK source and 1PPS, if there is
-no GPS-disciplined oscillator available. It is necessary to synchronise the
-1PPS source to the 10MHz source.
-
-The UHD Output module (C++) has to be modified if the USRP internal GPSDO option
-is used.
-
-###########
-june 2012, initial version, Matthias P. Braendli
-feb 2014, renamed crc-dabXYZ to odr-dabXYZ, mpb