uhd: increase initial transmit transport latency

For network based devices (USRP2, N200, etc.), increase the
latency from 2 to 3 frames, which effectively buffers more
samples on the host in front of the Ethernet interface.

USB devices (USRP1 and B100) utilize an adaptive mechanism
so they are less effected by this value.

Signed-off-by: Thomas Tsou <ttsou@vt.edu>

git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2685 19bc5d8c-e614-43d4-8b26-e1612bc8e597
diff --git a/Transceiver52M/runTransceiver.cpp b/Transceiver52M/runTransceiver.cpp
index 48362ed..8c22420 100644
--- a/Transceiver52M/runTransceiver.cpp
+++ b/Transceiver52M/runTransceiver.cpp
@@ -84,7 +84,7 @@
   }
 
   RadioInterface* radio = new RadioInterface(usrp,3,SAMPSPERSYM,mOversamplingRate,false);
-  Transceiver *trx = new Transceiver(5700,"127.0.0.1",SAMPSPERSYM,GSM::Time(2,0),radio);
+  Transceiver *trx = new Transceiver(5700,"127.0.0.1",SAMPSPERSYM,GSM::Time(3,0),radio);
   trx->receiveFIFO(radio->receiveFIFO());
 /*
   signalVector *gsmPulse = generateGSMPulse(2,1);