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-rw-r--r--host/docs/usrp2.rst14
1 files changed, 14 insertions, 0 deletions
diff --git a/host/docs/usrp2.rst b/host/docs/usrp2.rst
index 4c95fb24c..72a919d1a 100644
--- a/host/docs/usrp2.rst
+++ b/host/docs/usrp2.rst
@@ -211,6 +211,20 @@ Hardware setup notes
------------------------------------------------------------------------
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+Front panel LEDs
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+The LEDs on the front panel can be useful in debugging hardware and software issues.
+The LEDs reveal the following about the state of the device:
+
+* **LED A:** transmitting
+* **LED B:** undocumented
+* **LED C:** receiving
+* **LED D:** firmware loaded
+* **LED E:** undocumented
+* **LED F:** FPGA loaded
+
+
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Ref Clock - 10MHz
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Using an external 10MHz reference clock requires a signal level between