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diff --git a/src/intersim2/routers/router.cpp b/src/intersim2/routers/router.cpp
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+// $Id: router.cpp 5188 2012-08-30 00:31:31Z dub $
+
+/*
+ Copyright (c) 2007-2012, Trustees of The Leland Stanford Junior University
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+ Redistributions of source code must retain the above copyright notice, this 
+ list of conditions and the following disclaimer.
+ Redistributions in binary form must reproduce the above copyright notice, this
+ list of conditions and the following disclaimer in the documentation and/or
+ other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/*router.cpp
+ *
+ *The base class of either iq router or event router
+ *contains a list of channels and other router configuration variables
+ *
+ *The older version of the simulator uses an array of flits and credit to 
+ *simulate the channels. Newer version ueses flitchannel and credit channel
+ *which can better model channel delay
+ *
+ *The older version of the simulator also uses vc_router and chaos router
+ *which are replaced by iq rotuer and event router in the present form
+ */
+
+#include "booksim.hpp"
+#include <iostream>
+#include <cassert>
+#include "router.hpp"
+
+//////////////////Sub router types//////////////////////
+#include "iq_router.hpp"
+#include "event_router.hpp"
+#include "chaos_router.hpp"
+///////////////////////////////////////////////////////
+
+int const Router::STALL_BUFFER_BUSY = -2;
+int const Router::STALL_BUFFER_CONFLICT = -3;
+int const Router::STALL_BUFFER_FULL = -4;
+int const Router::STALL_BUFFER_RESERVED = -5;
+int const Router::STALL_CROSSBAR_CONFLICT = -6;
+
+Router::Router( const Configuration& config,
+		Module *parent, const string & name, int id,
+		int inputs, int outputs ) :
+TimedModule( parent, name ), _id( id ), _inputs( inputs ), _outputs( outputs ),
+   _partial_internal_cycles(0.0)
+{
+  _crossbar_delay   = ( config.GetInt( "st_prepare_delay" ) + 
+			config.GetInt( "st_final_delay" ) );
+  _credit_delay     = config.GetInt( "credit_delay" );
+  _input_speedup    = config.GetInt( "input_speedup" );
+  _output_speedup   = config.GetInt( "output_speedup" );
+  _internal_speedup = config.GetFloat( "internal_speedup" );
+  _classes          = config.GetInt( "classes" );
+
+#ifdef TRACK_FLOWS
+  _received_flits.resize(_classes, vector<int>(_inputs, 0));
+  _stored_flits.resize(_classes);
+  _sent_flits.resize(_classes, vector<int>(_outputs, 0));
+  _active_packets.resize(_classes);
+  _outstanding_credits.resize(_classes, vector<int>(_outputs, 0));
+#endif
+
+#ifdef TRACK_STALLS
+  _buffer_busy_stalls.resize(_classes, 0);
+  _buffer_conflict_stalls.resize(_classes, 0);
+  _buffer_full_stalls.resize(_classes, 0);
+  _buffer_reserved_stalls.resize(_classes, 0);
+  _crossbar_conflict_stalls.resize(_classes, 0);
+#endif
+
+}
+
+void Router::AddInputChannel( FlitChannel *channel, CreditChannel *backchannel )
+{
+  _input_channels.push_back( channel );
+  _input_credits.push_back( backchannel );
+  channel->SetSink( this, _input_channels.size() - 1 ) ;
+}
+
+void Router::AddOutputChannel( FlitChannel *channel, CreditChannel *backchannel )
+{
+  _output_channels.push_back( channel );
+  _output_credits.push_back( backchannel );
+  _channel_faults.push_back( false );
+  channel->SetSource( this, _output_channels.size() - 1 ) ;
+}
+
+void Router::Evaluate( )
+{
+  _partial_internal_cycles += _internal_speedup;
+  while( _partial_internal_cycles >= 1.0 ) {
+    _InternalStep( );
+    _partial_internal_cycles -= 1.0;
+  }
+}
+
+void Router::OutChannelFault( int c, bool fault )
+{
+  assert( ( c >= 0 ) && ( (size_t)c < _channel_faults.size( ) ) );
+
+  _channel_faults[c] = fault;
+}
+
+bool Router::IsFaultyOutput( int c ) const
+{
+  assert( ( c >= 0 ) && ( (size_t)c < _channel_faults.size( ) ) );
+
+  return _channel_faults[c];
+}
+
+/*Router constructor*/
+Router *Router::NewRouter( const Configuration& config,
+			   Module *parent, const string & name, int id,
+			   int inputs, int outputs )
+{
+  const string type = config.GetStr( "router" );
+  Router *r = NULL;
+  if ( type == "iq" ) {
+    r = new IQRouter( config, parent, name, id, inputs, outputs );
+  } else if ( type == "event" ) {
+    r = new EventRouter( config, parent, name, id, inputs, outputs );
+  } else if ( type == "chaos" ) {
+    r = new ChaosRouter( config, parent, name, id, inputs, outputs );
+  } else {
+    cerr << "Unknown router type: " << type << endl;
+  }
+  /*For additional router, add another else if statement*/
+  /*Original booksim specifies the router using "flow_control"
+   *we now simply call these types. 
+   */
+
+  return r;
+}
+
+
+
+
+