diff --git a/usb_protocol/types/superspeed/__init__.py b/usb_protocol/types/superspeed/__init__.py
new file mode 100644
index 0000000..548c809
--- /dev/null
+++ b/usb_protocol/types/superspeed/__init__.py
@@ -0,0 +1,59 @@
+#
+# This file is part of usb-protocol.
+#
+""" SuperSpeed USB types -- defines enumerations that describe standard USB3 types. """
+
+from enum import IntEnum
+
+class LinkCommand(IntEnum):
+    """ Constant values (including both class and type) for link commands. """
+
+    LGOOD = 0   # Header Packet ACK
+    LCRD  = 1   # Header Credit
+    LRTY  = 2   # Header Packet Retry Sequence
+    LBAD  = 3   # Header Packet NAK
+    LGO_U = 4   # Request Switching to Power State Ux
+    LAU   = 5   # Power State Acceptance
+    LXU   = 6   # Power State Rejection
+    LPMA  = 7   # Power State Acknowledgement
+    LDN   = 8   # Downstream-facing Keep-alive
+    LUP   = 11  # Upstream-facing Keep-alive
+
+    def get_class(self):
+        return int(self) >> 2
+
+    def get_type(self):
+        return int(self) & 0b11
+
+
+class HeaderPacketType(IntEnum):
+    """ Constants representing the Header Packet archetypes. """
+    TRANSACTION           = 0b00100
+    DATA                  = 0b01000
+    ISOCHRONOUS_TIMESTAMP = 0b01100
+    LINK_MANAGEMENT       = 0b00000
+
+
+class TransactionPacketSubtype(IntEnum):
+    """ Constants representing the subtypes of Transition Header Packet. """
+
+    ACK           = 1
+    NRDY          = 2
+    ERDY          = 3
+    STATUS        = 4
+    STALL         = 5
+    NOTIFICATION  = 6
+    PING          = 7
+    PING_RESPONSE = 8
+
+
+class LinkManagementPacketSubtype(IntEnum):
+    """ Constants represneting the various types of Link Management Packet. """
+
+    SET_LINK_FUNCTION           = 1
+    U2_INACTIVITY_TIMEOUT       = 2
+    VENDOR_DEVICE_TEST          = 3
+    PORT_CAPABILITY             = 4
+    PORT_CONFIGURATION          = 5
+    PORT_CONFIGURATION_RESPONSE = 6
+    PRECISION_TIME_MANAGEMENT   = 7