--- a/src/common/data-rate.cc	Thu Feb 14 00:36:14 2008 +0100
+++ b/src/common/data-rate.cc	Thu Feb 14 00:36:25 2008 +0100
@@ -185,6 +185,36 @@
   return m_bps;
 }
 
+DataRate::DataRate (PValue value)
+{
+  *this = ClassValueHelperExtractFrom<DataRate,DataRateValue> (value);
+}
+DataRate::operator PValue () const
+{
+  return ClassValueHelperConvertTo<DataRate,DataRateValue> (this);
+}
+
+std::ostream &operator << (std::ostream &os, const DataRate &rate)
+{
+  os << rate.GetBitRate () << "bps";
+  return os;
+}
+std::istream &operator >> (std::istream &is, DataRate &rate)
+{
+  std::string value;
+  is >> value;
+  uint64_t v;
+  bool ok = DoParse (value, &v);
+  if (!ok)
+    {
+      is.setstate (std::ios_base::failbit);
+    }
+  rate = DataRate (v);
+  return is;
+}
+
+
+
 double operator*(const DataRate& lhs, const Time& rhs)
 {
   return rhs.GetSeconds()*lhs.GetBitRate();

--- a/src/common/data-rate.h	Thu Feb 14 00:36:14 2008 +0100
+++ b/src/common/data-rate.h	Thu Feb 14 00:36:25 2008 +0100
@@ -27,6 +27,8 @@
 #include <stdint.h>
 #include "ns3/nstime.h"
 #include "ns3/default-value.h"
+#include "ns3/value.h"
+#include "ns3/class-value-helper.h"
 
 namespace ns3 {
 
@@ -94,10 +96,27 @@
    */
   uint64_t GetBitRate() const;
   
-  private:
+  DataRate (PValue value);
+  operator PValue () const;
+private:
   uint64_t m_bps;
   static uint64_t Parse(const std::string);
 };
+
+std::ostream &operator << (std::ostream &os, const DataRate &rate);
+std::istream &operator >> (std::istream &is, DataRate &rate);
+
+class DataRateValue : public Value {};
+class DataRateParamSpec : public Value {};
+
+template <typename T1>
+Ptr<ParamSpec>
+MakeDataRateParamSpec (T1 a1, DataRate initialValue);
+
+template <typename T1, typename T2>
+Ptr<ParamSpec>
+MakeDataRateParamSpec (T1 a1, T2 a2, DataRate initialValue);
+
 /**
  * \param lhs
  * \param rhs
@@ -122,6 +141,26 @@
   DataRate m_value;
 };
 
-};//namespace ns3
+} //namespace ns3
+
+namespace ns3 {
+
+template <typename T1>
+Ptr<ParamSpec>
+MakeDataRateParamSpec (T1 a1, DataRate initialValue)
+{
+  return MakeClassValueHelperParamSpec<DataRate,DataRateValue,DataRateParamSpec>
+    (a1, initialValue);
+}
+
+template <typename T1, typename T2>
+Ptr<ParamSpec>
+MakeDataRateParamSpec (T1 a1, T2 a2, DataRate initialValue)
+{
+  return MakeClassValueHelperParamSpec<DataRate,DataRateValue,DataRateParamSpec>
+    (a1, a2, initialValue);
+}
+
+} // namespace ns3
 
 #endif /* DATA_RATE_H */