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diff --git a/src/python/_framework/base/packets/interfaces.py b/src/python/_framework/base/packets/interfaces.py
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+# Copyright 2015, Google Inc.
+# 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.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# 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.
+
+"""Interfaces defined and used by the base layer of RPC Framework."""
+
+import abc
+
+# packets is referenced from specifications in this module.
+from _framework.base import interfaces
+from _framework.base.packets import packets  # pylint: disable=unused-import
+
+
+class ForeLink(object):
+  """Accepts back-to-front tickets and emits front-to-back tickets."""
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def accept_back_to_front_ticket(self, ticket):
+    """Accept a packets.BackToFrontPacket.
+
+    Args:
+      ticket: Any packets.BackToFrontPacket.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def join_rear_link(self, rear_link):
+    """Mates this object with a peer with which it will exchange tickets."""
+    raise NotImplementedError()
+
+
+class RearLink(object):
+  """Accepts front-to-back tickets and emits back-to-front tickets."""
+  __metaclass__ = abc.ABCMeta
+
+  @abc.abstractmethod
+  def accept_front_to_back_ticket(self, ticket):
+    """Accepts a packets.FrontToBackPacket.
+
+    Args:
+      ticket: Any packets.FrontToBackPacket.
+    """
+    raise NotImplementedError()
+
+  @abc.abstractmethod
+  def join_fore_link(self, fore_link):
+    """Mates this object with a peer with which it will exchange tickets."""
+    raise NotImplementedError()
+
+
+class Front(ForeLink, interfaces.Front):
+  """Clientish objects that operate by sending and receiving tickets."""
+  __metaclass__ = abc.ABCMeta
+
+
+class Back(RearLink, interfaces.Back):
+  """Serverish objects that operate by sending and receiving tickets."""
+  __metaclass__ = abc.ABCMeta