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-rw-r--r--host/docs/usrp2.rst11
1 files changed, 10 insertions, 1 deletions
diff --git a/host/docs/usrp2.rst b/host/docs/usrp2.rst
index 0d48209be..745361b77 100644
--- a/host/docs/usrp2.rst
+++ b/host/docs/usrp2.rst
@@ -213,10 +213,19 @@ Hardware setup notes
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Ref Clock - 10MHz
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-Using an external 10MHz reference clock requires a signal level between +5dBm and +20dBm at 10MHz applied to the Ref Clock SMA port on the front panel.
+Using an external 10MHz reference clock requires a signal level between
++5dBm and +20dBm at 10MHz applied to the Ref Clock SMA port on the front panel.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
PPS - Pulse Per Second
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Using a PPS signal for timestamp synchronization requires a 5Vpp square wave signal
+
+Test the PPS input of the USRP2 with the following app:
+::
+
+ cd <prefix>/share/uhd/examples
+ ./test_pps_input --args=<args>
+
+* <args> are device address arguments (optional if only one USRP is on your machine)