diff --git a/client/port.h b/client/port.h
index 77ae2d5..281a61a 100644
--- a/client/port.h
+++ b/client/port.h
@@ -98,8 +98,6 @@ public:
         { return d.is_exclusive_control(); }
     OstProto::TransmitMode transmitMode() 
         { return d.transmit_mode(); }
-    OstProto::StreamType streamsType()
-        { return d.streams_type(); }
     double averagePacketRate()
         { return avgPacketsPerSec_; }
     double averageBitRate()
diff --git a/client/portconfigdialog.cpp b/client/portconfigdialog.cpp
index 92ba739..96028fd 100644
--- a/client/portconfigdialog.cpp
+++ b/client/portconfigdialog.cpp
@@ -68,23 +68,9 @@ PortConfigDialog::PortConfigDialog(
 
     exclusiveControlButton->setChecked(portConfig_.is_exclusive_control());
 
-    switch(portConfig_.streams_type())
-    {
-    case OstProto::kUnsignedStream:
-        signedStreamsButton->setChecked(false);
-        break;
-    case OstProto::kSignedStream:
-        signedStreamsButton->setChecked(true);
-        break;
-    default:
-        Q_ASSERT(false); // Unreachable!!!
-        break;
-    }
-
     // Disable UI elements based on portState
     if (portState.is_transmit_on()) {
         transmitModeBox->setDisabled(true);
-        signedStreamsButton->setDisabled(true);
     }
 }
 
@@ -118,11 +104,6 @@ void PortConfigDialog::accept()
 
     pc.set_is_exclusive_control(exclusiveControlButton->isChecked());
 
-    if (signedStreamsButton->isChecked())
-        pc.set_streams_type(OstProto::kSignedStream);
-    else
-        pc.set_streams_type(OstProto::kUnsignedStream);
-
     // Update fields that have changed, clear the rest
     if (pc.transmit_mode() != portConfig_.transmit_mode())
         portConfig_.set_transmit_mode(pc.transmit_mode());
@@ -139,10 +120,5 @@ void PortConfigDialog::accept()
     else
         portConfig_.clear_is_exclusive_control();
 
-    if (pc.streams_type() != portConfig_.streams_type())
-        portConfig_.set_streams_type(pc.streams_type());
-    else
-        portConfig_.clear_streams_type();
-
     QDialog::accept();
 }
diff --git a/client/portconfigdialog.ui b/client/portconfigdialog.ui
index 711cd3d..14ded8f 100644
--- a/client/portconfigdialog.ui
+++ b/client/portconfigdialog.ui
@@ -69,13 +69,6 @@
      </property>
     </widget>
    </item>
-   <item>
-    <widget class="QCheckBox" name="signedStreamsButton" >
-     <property name="text" >
-      <string>Signed Streams</string>
-     </property>
-    </widget>
-   </item>
    <item>
     <spacer>
      <property name="orientation" >
diff --git a/client/portswindow.cpp b/client/portswindow.cpp
index 9e4fd04..c1bb4b7 100644
--- a/client/portswindow.cpp
+++ b/client/portswindow.cpp
@@ -726,7 +726,6 @@ void PortsWindow::on_actionPort_Configuration_triggered()
     // which says copy only modifiable fields
     //plm->port(current).protoDataCopyInto(&config);
     config.set_transmit_mode(port.transmitMode());
-    config.set_streams_type(port.streamsType());
     config.set_is_exclusive_control(port.hasExclusiveControl());
     config.set_user_name(port.userName().toStdString());
 
diff --git a/common/protocol.proto b/common/protocol.proto
index 8850212..a08307b 100644
--- a/common/protocol.proto
+++ b/common/protocol.proto
@@ -196,11 +196,6 @@ enum TransmitMode {
     kInterleavedTransmit = 1;
 }
 
-enum StreamType {
-    kUnsignedStream = 0; // FIXME: rename? convert to flags?
-    kSignedStream = 1;
-}
-
 message Port {
     required PortId port_id = 1;
     optional string name = 2;
@@ -210,7 +205,6 @@ message Port {
     optional bool is_exclusive_control = 6;
     optional TransmitMode transmit_mode = 7 [default = kSequentialTransmit];
     optional string user_name = 8;
-    optional StreamType streams_type = 9 [default = kUnsignedStream];
 }
 
 message PortConfigList {
diff --git a/server/abstractport.cpp b/server/abstractport.cpp
index 1764d52..6f1c7c4 100644
--- a/server/abstractport.cpp
+++ b/server/abstractport.cpp
@@ -78,12 +78,6 @@ bool AbstractPort::canModify(const OstProto::Port &port, bool *dirty)
         allow = !isTransmitOn();
     }
 
-    if (port.has_streams_type()
-            && (port.streams_type() != data_.streams_type())) {
-        *dirty = true;
-        allow = !isTransmitOn();
-    }
-
     return allow;
 }
 
@@ -104,9 +98,6 @@ bool AbstractPort::modify(const OstProto::Port &port)
     if (port.has_transmit_mode())
         data_.set_transmit_mode(port.transmit_mode());
 
-    if (port.has_streams_type())
-        setStreamsType(port.streams_type());
-
     if (port.has_user_name()) {
         data_.set_user_name(port.user_name());
     }
@@ -180,11 +171,6 @@ void AbstractPort::addNote(QString note)
     data_.set_notes(notes.toStdString());
 }
 
-bool AbstractPort::setStreamsType(OstProto::StreamType type)
-{
-    data_.set_streams_type(type);
-}
-
 AbstractPort::Accuracy AbstractPort::rateAccuracy()
 {
     return rateAccuracy_;
diff --git a/server/abstractport.h b/server/abstractport.h
index da5c70e..a604bd2 100644
--- a/server/abstractport.h
+++ b/server/abstractport.h
@@ -103,8 +103,6 @@ public:
     bool isDirty() { return isSendQueueDirty_; }
     void setDirty() { isSendQueueDirty_ = true; }
 
-    virtual bool setStreamsType(OstProto::StreamType type);
-
     Accuracy rateAccuracy();
     virtual bool setRateAccuracy(Accuracy accuracy);
 
diff --git a/server/pcapport.cpp b/server/pcapport.cpp
index b297d50..700358f 100644
--- a/server/pcapport.cpp
+++ b/server/pcapport.cpp
@@ -117,26 +117,6 @@ void PcapPort::updateNotes()
             arg(notes).toStdString());
 }
 
-bool PcapPort::setStreamsType(OstProto::StreamType type)
-{
-    AbstractPort::setStreamsType(type);
-    transmitter_->useSignedStreams(type == OstProto::kSignedStream);
-
-    // XXX: Because of the way we implement signed tx stats, changing
-    // streamsType requires us to set sign tx stats equal to tx stats
-    // followed by clear stats; see note in PcapTxStats::run() for details
-    // FIXME: can we get away with clearing only sign stats?
-    // FIXME: Ideally PcapPort should *NOT* know how PcapTxStats implements
-    // sign stats
-    stats_.sign.txPkts = stats_.txPkts;
-    stats_.sign.txBytes = stats_.txBytes;
-    stats_.sign.rxPkts = stats_.rxPkts;
-    stats_.sign.rxBytes = stats_.rxBytes;
-    resetStats();
-
-    return true;
-}
-
 bool PcapPort::setRateAccuracy(AbstractPort::Accuracy accuracy)
 {
     if (transmitter_->setRateAccuracy(accuracy)) {
diff --git a/server/pcapport.h b/server/pcapport.h
index bedeeee..04e8269 100644
--- a/server/pcapport.h
+++ b/server/pcapport.h
@@ -39,8 +39,6 @@ public:
     virtual bool hasExclusiveControl() { return false; }
     virtual bool setExclusiveControl(bool /*exclusive*/) { return false; }
 
-    virtual bool setStreamsType(OstProto::StreamType type);
-
     virtual bool setRateAccuracy(AbstractPort::Accuracy accuracy); 
 
     virtual void clearPacketList() {