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diff --git a/usrp/host/include/usrp/usrp_subdev_spec.h b/usrp/host/include/usrp/usrp_subdev_spec.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2008 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef INCLUDED_USRP_SUBDEV_SPEC_H
+#define INCLUDED_USRP_SUBDEV_SPEC_H
+
+/*!
+ * \brief specify a daughterboard and subdevice on a daughterboard.
+ *
+ * In the USRP1, there are two sides, A and B.
+ *
+ * A daughterboard generally implements a single subdevice, but may in
+ * general implement any number of subdevices.  At this time, all daughterboards
+ * with the exception of the Basic Rx and LF Rx implement a single subdevice.
+ *
+ * The Basic Rx and LF Rx implement 2 subdevices (soon 3).  Subdevice
+ * 0 routes input RX-A to the DDC I input and routes a constant zero
+ * to the DDC Q input.  Similarly, subdevice 1 routes input RX-B to
+ * the DDC I input and routes a constant zero to the DDC Q
+ * input.  Subdevice 2 (when implemented) will route RX-A to the DDC I
+ * input and RX-B to the DDC Q input.
+ */
+
+struct usrp_subdev_spec {
+  unsigned int	side;		// 0 -> A; 1 -> B
+  unsigned int	subdev;		// which subdevice (usually zero)
+
+  usrp_subdev_spec(unsigned int _side = 0, unsigned int _subdev = 0)
+    : side(_side), subdev(_subdev) {}
+};
+
+#endif /* INCLUDED_USRP_SUBDEV_SPEC_H */