diff --git a/src/osmo_gsm_tester/bts.py b/src/osmo_gsm_tester/bts.py
new file mode 100644
index 0000000..289b697
--- /dev/null
+++ b/src/osmo_gsm_tester/bts.py
@@ -0,0 +1,95 @@
+# osmo_gsm_tester: base classes to share code among BTS subclasses.
+#
+# Copyright (C) 2018 by sysmocom - s.f.m.c. GmbH
+#
+# Author: Pau Espin Pedrol <pespin@sysmocom.de>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+import pprint
+import tempfile
+from abc import ABCMeta, abstractmethod
+from . import log, config, util, template, process, event_loop, pcu_osmo
+
+class Bts(log.Origin, metaclass=ABCMeta):
+    suite_run = None
+    conf = None
+    bsc = None
+    sgsn = None
+    lac = None
+    rac = None
+    cellid = None
+    bvci = None
+
+##############
+# PROTECTED
+##############
+    def __init__(self, suite_run, conf, name):
+        super().__init__(log.C_RUN, name)
+        self.suite_run = suite_run
+        self.conf = conf
+
+########################
+# PUBLIC - INTERNAL API
+########################
+    @abstractmethod
+    def conf_for_bsc(self):
+        'Used by bsc objects to get path to socket.'
+        pass
+
+    def remote_addr(self):
+        return self.conf.get('addr')
+
+    def cleanup(self):
+        'Nothing to do by default. Subclass can override if required.'
+        pass
+
+###################
+# PUBLIC (test API included)
+###################
+    @abstractmethod
+    def start(self):
+        'Starts BTS proccess and sets self.proc_bts with an object of Process interface'
+        pass
+
+    @abstractmethod
+    def ready_for_pcu(self):
+        'True if the BTS is prepared to have a PCU connected, false otherwise'
+        pass
+
+    @abstractmethod
+    def pcu(self):
+        'Get the Pcu object associated with the BTS'
+        pass
+
+    def set_bsc(self, bsc):
+        self.bsc = bsc
+
+    def set_sgsn(self, sgsn):
+        self.sgsn = sgsn
+
+    def set_lac(self, lac):
+        self.lac = lac
+
+    def set_rac(self, rac):
+        self.rac = rac
+
+    def set_cellid(self, cellid):
+        self.cellid = cellid
+
+    def set_bvci(self, bvci):
+        self.bvci = bvci
+
+# vim: expandtab tabstop=4 shiftwidth=4
diff --git a/src/osmo_gsm_tester/bts_osmo.py b/src/osmo_gsm_tester/bts_osmo.py
index 5ae3392..60b9695 100644
--- a/src/osmo_gsm_tester/bts_osmo.py
+++ b/src/osmo_gsm_tester/bts_osmo.py
@@ -21,26 +21,17 @@
 import pprint
 import tempfile
 from abc import ABCMeta, abstractmethod
-from . import log, config, util, template, process, event_loop, pcu_osmo
+from . import log, config, util, template, process, event_loop, bts, pcu_osmo
 
-class OsmoBts(log.Origin, metaclass=ABCMeta):
-    suite_run = None
+class OsmoBts(bts.Bts, metaclass=ABCMeta):
     proc_bts = None
-    bsc = None
-    sgsn = None
-    lac = None
-    rac = None
-    cellid = None
-    bvci = None
     _pcu = None
 
 ##############
 # PROTECTED
 ##############
     def __init__(self, suite_run, conf, name):
-        super().__init__(log.C_RUN, name)
-        self.suite_run = suite_run
-        self.conf = conf
+        super().__init__(suite_run, conf, name)
         if len(self.pcu_socket_path().encode()) > 107:
             raise log.Error('Path for pcu socket is longer than max allowed len for unix socket path (107):', self.pcu_socket_path())
 
@@ -49,7 +40,7 @@
 ########################
     @abstractmethod
     def conf_for_bsc(self):
-        'Used by bsc objects to get path to socket.'
+        # coming from bts.Bts, we forward the implementation to children.
         pass
 
     @abstractmethod
@@ -62,19 +53,12 @@
         'Used by base class. Subclass can create different pcu implementations.'
         pass
 
-    def remote_addr(self):
-        return self.conf.get('addr')
-
-    def cleanup(self):
-        'Nothing to do by default. Subclass can override if required.'
-        pass
-
 ###################
 # PUBLIC (test API included)
 ###################
     @abstractmethod
     def start(self):
-        'Starts BTS proccess and sets self.proc_bts with an object of Process interface'
+        # coming from bts.Bts, we forward the implementation to children.
         pass
 
     def ready_for_pcu(self):
@@ -87,25 +71,6 @@
             self._pcu = self.create_pcu()
         return self._pcu
 
-    def set_bsc(self, bsc):
-        self.bsc = bsc
-
-    def set_sgsn(self, sgsn):
-        self.sgsn = sgsn
-
-    def set_lac(self, lac):
-        self.lac = lac
-
-    def set_rac(self, rac):
-        self.rac = rac
-
-    def set_cellid(self, cellid):
-        self.cellid = cellid
-
-    def set_bvci(self, bvci):
-        self.bvci = bvci
-
-
 class OsmoBtsMainUnit(OsmoBts, metaclass=ABCMeta):
 ##############
 # PROTECTED
@@ -120,6 +85,7 @@
 ########################
     @abstractmethod
     def conf_for_bsc(self):
+        # coming from bts.Bts, we forward the implementation to children.
         pass
 
     def cleanup(self):
@@ -143,4 +109,5 @@
 ###################
     @abstractmethod
     def start(self):
+        # coming from bts.Bts, we forward the implementation to children.
         pass