diff --git a/include/grgsm/qa_utils/burst_sink.h b/include/grgsm/qa_utils/burst_sink.h
index 774075f..ed811ed 100644
--- a/include/grgsm/qa_utils/burst_sink.h
+++ b/include/grgsm/qa_utils/burst_sink.h
@@ -54,6 +54,8 @@
       virtual std::vector<int> get_timeslots() = 0;
       virtual std::vector<std::string> get_burst_data() = 0;
       virtual pmt::pmt_t get_bursts() = 0;      
+      virtual std::vector<uint8_t> get_sub_types() = 0;
+      virtual std::vector<uint8_t> get_sub_slots() = 0;
     };
   } // namespace gsm
 } // namespace gr
diff --git a/include/grgsm/qa_utils/burst_source.h b/include/grgsm/qa_utils/burst_source.h
index e74a8aa..2f249ad 100644
--- a/include/grgsm/qa_utils/burst_source.h
+++ b/include/grgsm/qa_utils/burst_source.h
@@ -54,6 +54,7 @@
       virtual void set_framenumbers(const std::vector<int> &framenumbers) = 0;
       virtual void set_timeslots(const std::vector<int> &timeslots) = 0;
       virtual void set_burst_data(const std::vector<std::string> &burst_data) = 0;
+      virtual void set_arfcn(uint16_t arfcn) = 0;
     };
 
   } // namespace gsm
diff --git a/lib/qa_utils/burst_sink_impl.cc b/lib/qa_utils/burst_sink_impl.cc
index bdc2192..5151bf6 100644
--- a/lib/qa_utils/burst_sink_impl.cc
+++ b/lib/qa_utils/burst_sink_impl.cc
@@ -90,6 +90,8 @@
         d_framenumbers.push_back(frame_nr);
         d_timeslots.push_back(header->timeslot);
         d_burst_data.push_back(burst_str.str());
+        d_sub_types.push_back(header->sub_type);
+        d_sub_slots.push_back(header->sub_slot);
     }
 
     std::vector<int> burst_sink_impl::get_framenumbers()
@@ -110,6 +112,14 @@
     {
         return d_bursts;
     }
+    std::vector<uint8_t> burst_sink_impl::get_sub_types()
+    {
+        return d_sub_types;
+    }
+    std::vector<uint8_t> burst_sink_impl::get_sub_slots()
+    {
+        return d_sub_slots;
+    }
   } /* namespace gsm */
 } /* namespace gr */
 
diff --git a/lib/qa_utils/burst_sink_impl.h b/lib/qa_utils/burst_sink_impl.h
index e87422d..15e3bcf 100644
--- a/lib/qa_utils/burst_sink_impl.h
+++ b/lib/qa_utils/burst_sink_impl.h
@@ -36,6 +36,8 @@
       std::vector<int> d_timeslots;
       std::vector<std::string> d_burst_data;
       pmt::pmt_t d_bursts;
+      std::vector<uint8_t> d_sub_types;
+      std::vector<uint8_t> d_sub_slots;
      public:
       burst_sink_impl();
       ~burst_sink_impl();
@@ -44,6 +46,8 @@
       virtual std::vector<int> get_timeslots();
       virtual std::vector<std::string> get_burst_data();
       virtual pmt::pmt_t get_bursts();
+      virtual std::vector<uint8_t> get_sub_types();
+      virtual std::vector<uint8_t> get_sub_slots();
     };
 
   } // namespace gsm
diff --git a/lib/qa_utils/burst_source_impl.cc b/lib/qa_utils/burst_source_impl.cc
index f415eaf..276ed0e 100644
--- a/lib/qa_utils/burst_source_impl.cc
+++ b/lib/qa_utils/burst_source_impl.cc
@@ -52,7 +52,8 @@
       : gr::block("burst_source",
               gr::io_signature::make(0, 0, 0),
               gr::io_signature::make(0, 0, 0)),
-              d_finished(false)
+              d_finished(false),
+              d_arfcn(0)
     {
         message_port_register_out(pmt::mp("out"));
         set_framenumbers(framenumbers);
@@ -85,6 +86,11 @@
         d_burst_data = burst_data;
     }
 
+    void burst_source_impl::set_arfcn(uint16_t arfcn)
+    {
+        d_arfcn = arfcn;
+    }
+
     bool burst_source_impl::start()
     {
         d_finished = false;
@@ -122,7 +128,7 @@
                 tap_header->timeslot = d_timeslots[i];
                 tap_header->frame_number = htobe32(d_framenumbers[i]);
                 tap_header->sub_type = GSMTAP_BURST_NORMAL;
-                tap_header->arfcn = 0;
+                tap_header->arfcn = d_arfcn;
                 tap_header->signal_dbm = 0;
                 tap_header->snr_db = 0;
 
diff --git a/lib/qa_utils/burst_source_impl.h b/lib/qa_utils/burst_source_impl.h
index cc7d9b4..bbcfd98 100644
--- a/lib/qa_utils/burst_source_impl.h
+++ b/lib/qa_utils/burst_source_impl.h
@@ -40,6 +40,7 @@
         std::vector<int> d_timeslots;
         std::vector<std::string> d_burst_data;
         bool d_finished;
+        uint16_t d_arfcn;
         void run();
      public:
         burst_source_impl(const std::vector<int> &framenumbers,
@@ -49,6 +50,7 @@
         virtual void set_framenumbers(const std::vector<int> &framenumbers);
         virtual void set_timeslots(const std::vector<int> &timeslots);
         virtual void set_burst_data(const std::vector<std::string> &burst_data);
+        virtual void set_arfcn(uint16_t arfcn);
         bool start();
         bool stop();
         bool finished();
diff --git a/python/CMakeLists.txt b/python/CMakeLists.txt
index 21f2507..97cb0a3 100644
--- a/python/CMakeLists.txt
+++ b/python/CMakeLists.txt
@@ -45,7 +45,7 @@
 include(GrTest)
 
 set(GR_TEST_TARGET_DEPS gr-gsm)
-set(GR_TEST_PYTHON_DIRS ${CMAKE_BINARY_DIR}/swig:${CMAKE_BINARY_DIR}/python/misc_utils)
+set(GR_TEST_PYTHON_DIRS ${CMAKE_BINARY_DIR}/swig:${CMAKE_BINARY_DIR}/python/misc_utils:${CMAKE_BINARY_DIR}/python/receiver:${CMAKE_BINARY_DIR}/python/demapping:${CMAKE_BINARY_DIR}/python/transmitter)
 GR_ADD_TEST(qa_arfcn ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_arfcn.py)
 GR_ADD_TEST(qa_decryption ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_decryption.py)
 GR_ADD_TEST(qa_burst_printer ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_burst_printer.py)
@@ -61,6 +61,9 @@
 GR_ADD_TEST(qa_tch_h_decoder ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_tch_h_decoder.py)
 GR_ADD_TEST(qa_tch_f_chans_demapper ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_tch_f_chans_demapper.py)
 GR_ADD_TEST(qa_tch_h_chans_demapper ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_tch_h_chans_demapper.py)
+GR_ADD_TEST(qa_gsm_bcch_ccch_demapper ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_gsm_bcch_ccch_demapper.py)
+GR_ADD_TEST(qa_gsm_bcch_ccch_sdcch4_demapper ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_gsm_bcch_ccch_sdcch4_demapper.py)
+GR_ADD_TEST(qa_gsm_sdcch8_demapper ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_gsm_sdcch8_demapper.py)
 #GR_ADD_TEST(qa_msg_to_tag ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_msg_to_tag.py)
 #GR_ADD_TEST(qa_controlled_fractional_resampler_cc ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_controlled_fractional_resampler_cc.py)
 #GR_ADD_TEST(qa_uplink_downlink_splitter ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_uplink_downlink_splitter.py)
diff --git a/python/qa_gsm_bcch_ccch_demapper.py b/python/qa_gsm_bcch_ccch_demapper.py
new file mode 100644
index 0000000..a57bc6b
--- /dev/null
+++ b/python/qa_gsm_bcch_ccch_demapper.py
@@ -0,0 +1,146 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# @file
+# @author (C) 2019 by Vasil Velichkov <vvvelichkov@gmail.com>
+# @section LICENSE
+#
+# Gr-gsm 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, or (at your option)
+# any later version.
+#
+# Gr-gsm 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 gr-gsm; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+#
+
+import unittest
+import numpy as np
+from gnuradio import gr, gr_unittest, blocks
+import grgsm
+import pmt
+import qa_gsm_demapper_data as test_data
+
+class qa_gsm_bcch_ccch_demapper (gr_unittest.TestCase):
+
+    def setUp (self):
+        self.tb = gr.top_block ()
+        self.maxDiff = None
+
+    def tearDown (self):
+        self.tb = None
+
+    def test_downlink (self):
+        """
+           BCCH_CCCH demapper downlink test
+        """
+        src = grgsm.burst_source(test_data.frames, test_data.timeslots, test_data.bursts)
+        src.set_arfcn(0); # downlink
+        demapper = grgsm.gsm_bcch_ccch_demapper(timeslot_nr=0)
+        dst = grgsm.burst_sink()
+
+        self.tb.msg_connect(src, "out", demapper, "bursts")
+        self.tb.msg_connect(demapper, "bursts", dst, "in")
+        self.tb.run ()
+
+        b = test_data.bursts
+        self.assertEqual([
+            b[  2], b[  3], b[  4], b[  5], #BCCH
+            b[  6], b[  7], b[  8], b[  9], #CCCH skip 10-11
+            b[ 12], b[ 13], b[ 14], b[ 15],
+            b[ 16], b[ 17], b[ 18], b[ 19], #skip 20-21
+            b[ 22], b[ 23], b[ 24], b[ 25],
+            b[ 26], b[ 27], b[ 28], b[ 29], #skip 30-31
+            b[ 32], b[ 33], b[ 34], b[ 35],
+            b[ 36], b[ 37], b[ 38], b[ 39], #skip 40-41
+            b[ 42], b[ 43], b[ 44], b[ 45],
+            b[ 46], b[ 47], b[ 48], b[ 49], #skip 50-52
+            b[ 53], b[ 54], b[ 55], b[ 56], #BCCH
+            b[ 57], b[ 58], b[ 59], b[ 60], #CCCH skip 61-62
+            b[ 63], b[ 64], b[ 65], b[ 66],
+            b[ 67], b[ 68], b[ 69], b[ 70], #skip 71-72
+            b[ 73], b[ 74], b[ 75], b[ 76],
+            b[ 77], b[ 78], b[ 79], b[ 80], #skip 81-82
+            b[ 83], b[ 84], b[ 85], b[ 86],
+            b[ 87], b[ 88], b[ 89], b[ 90], #skip 91-92
+            b[ 93], b[ 94], b[ 95], b[ 96],
+            b[ 97], b[ 98], b[ 99], b[100], #skip 101-103
+            b[104], b[105], b[106], b[107]  #BCCH
+            ], list(dst.get_burst_data()))
+
+        self.assertEqual([
+              1,   1,   1,   1, #BCCH
+              2,   2,   2,   2, #CCCH
+              2,   2,   2,   2,
+              2,   2,   2,   2,
+              2,   2,   2,   2,
+              2,   2,   2,   2,
+              2,   2,   2,   2,
+              2,   2,   2,   2,
+              2,   2,   2,   2,
+              2,   2,   2,   2,
+              1,   1,   1,   1, #BCCH
+              2,   2,   2,   2, #CCCH
+              2,   2,   2,   2,
+              2,   2,   2,   2,
+              2,   2,   2,   2,
+              2,   2,   2,   2,
+              2,   2,   2,   2,
+              2,   2,   2,   2,
+              2,   2,   2,   2,
+              2,   2,   2,   2,
+              1,   1,   1,   1, #BCCH
+            ], list(dst.get_sub_types()))
+
+        self.assertEqual([
+            0, 0, 0, 0, #BCCH
+            0, 0, 0, 0, #CCCH 0
+            1, 1, 1, 1,
+            2, 2, 2, 2,
+            3, 3, 3, 3,
+            4, 4, 4, 4,
+            5, 5, 5, 5,
+            6, 6, 6, 6,
+            7, 7, 7, 7,
+            8, 8, 8, 8, #CCCH 8
+            0, 0, 0, 0, #BCCH
+            0, 0, 0, 0, #CCCH 0
+            1, 1, 1, 1,
+            2, 2, 2, 2,
+            3, 3, 3, 3,
+            4, 4, 4, 4,
+            5, 5, 5, 5,
+            6, 6, 6, 6,
+            7, 7, 7, 7,
+            8, 8, 8, 8, #CCCH 8
+            0, 0, 0, 0, #BCCH
+            ], list(dst.get_sub_slots()))
+
+    @unittest.expectedFailure
+    def test_uplink (self):
+        """
+           BCCH_CCCH demapper uplink test
+        """
+        src = grgsm.burst_source(test_data.frames, test_data.timeslots, test_data.bursts)
+        src.set_arfcn(0x2240); #uplink flag is 40
+        demapper = grgsm.gsm_bcch_ccch_demapper(timeslot_nr=0)
+        dst = grgsm.burst_sink()
+
+        self.tb.msg_connect(src, "out", demapper, "bursts")
+        self.tb.msg_connect(demapper, "bursts", dst, "in")
+        self.tb.run ()
+
+        b = test_data.bursts
+        self.assertEqual(b, list(dst.get_burst_data()))
+        self.assertEqual([3]*len(b), list(dst.get_sub_types()))
+        self.assertEqual([0]*len(b), list(dst.get_sub_slots()))
+
+if __name__ == '__main__':
+    gr_unittest.run(qa_gsm_bcch_ccch_demapper, "qa_gsm_bcch_ccch_demapper.xml")
diff --git a/python/qa_gsm_bcch_ccch_sdcch4_demapper.py b/python/qa_gsm_bcch_ccch_sdcch4_demapper.py
new file mode 100644
index 0000000..c71a2e1
--- /dev/null
+++ b/python/qa_gsm_bcch_ccch_sdcch4_demapper.py
@@ -0,0 +1,211 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# @file
+# @author (C) 2019 by Vasil Velichkov <vvvelichkov@gmail.com>
+# @section LICENSE
+#
+# Gr-gsm 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, or (at your option)
+# any later version.
+#
+# Gr-gsm 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 gr-gsm; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+#
+
+import unittest
+import numpy as np
+from gnuradio import gr, gr_unittest, blocks
+import grgsm
+import pmt
+import qa_gsm_demapper_data as test_data
+
+class qa_bcch_ccch_sdcch4_demapper (gr_unittest.TestCase):
+
+    def setUp (self):
+        self.tb = gr.top_block ()
+        self.maxDiff = None
+
+    def tearDown (self):
+        self.tb = None
+
+    @unittest.expectedFailure
+    def test_downlink (self):
+        """
+           BCCH_CCCH_SDCCH4 demapper downlink test
+        """
+        src = grgsm.burst_source(test_data.frames, test_data.timeslots, test_data.bursts)
+        src.set_arfcn(0); # downlink
+        demapper = grgsm.gsm_bcch_ccch_sdcch4_demapper(timeslot_nr=0)
+        dst = grgsm.burst_sink()
+
+        self.tb.msg_connect(src, "out", demapper, "bursts")
+        self.tb.msg_connect(demapper, "bursts", dst, "in")
+        self.tb.run ()
+
+        b = test_data.bursts
+        self.assertEqual([
+            b[  2], b[  3], b[  4], b[  5], #BCCH
+            b[  6], b[  7], b[  8], b[  9], #CCCH    skip 2
+            b[ 12], b[ 13], b[ 14], b[ 15], #CCCH
+            b[ 16], b[ 17], b[ 18], b[ 19], #CCCH    skip 2
+            b[ 22], b[ 23], b[ 24], b[ 25], #SDCCH 0
+            b[ 26], b[ 27], b[ 28], b[ 29], #SDCCH 1 skip 2
+            b[ 32], b[ 33], b[ 34], b[ 35], #SDCCH 2
+            b[ 36], b[ 37], b[ 38], b[ 39], #SDCCH 3 skip 2
+            b[ 42], b[ 43], b[ 44], b[ 45], #SACCH 0
+            b[ 46], b[ 47], b[ 48], b[ 49], #SACCH 1 skip 3
+            b[ 53], b[ 54], b[ 55], b[ 56], #BCCH
+            b[ 57], b[ 58], b[ 59], b[ 60], #CCCH    skip 2
+            b[ 63], b[ 64], b[ 65], b[ 66], #CCCH
+            b[ 67], b[ 68], b[ 69], b[ 70], #CCCH    skip 2
+            b[ 73], b[ 74], b[ 75], b[ 76], #SDCCH 0
+            b[ 77], b[ 78], b[ 79], b[ 80], #SDCCH 1 skip 2
+            b[ 83], b[ 84], b[ 85], b[ 86], #SDCCH 2
+            b[ 87], b[ 88], b[ 89], b[ 90], #SDCCH 3 skip 2
+            b[ 93], b[ 94], b[ 95], b[ 96], #SACCH 1
+            b[ 97], b[ 98], b[ 99], b[100], #SACCH 2 skip 3
+            b[104], b[105], b[106], b[107]  #BCCH
+            ], list(dst.get_burst_data()))
+
+        self.assertEqual([
+              1,   1,   1,   1, #BCCH
+              2,   2,   2,   2, #CCCH
+              2,   2,   2,   2, #CCCH
+              2,   2,   2,   2, #CCCH
+              7,   7,   7,   7, #SDCCH 0
+              7,   7,   7,   7, #SDCCH 1
+              7,   7,   7,   7, #SDCCH 2
+              7,   7,   7,   7, #SDCCH 3
+            135, 135, 135, 135, #SACCH 0
+            135, 135, 135, 135, #SACCH 1
+              1,   1,   1,   1, #BCCH
+              2,   2,   2,   2, #CCCH
+              2,   2,   2,   2, #CCCH
+              2,   2,   2,   2, #CCCH
+              7,   7,   7,   7, #SDCCH 0
+              7,   7,   7,   7, #SDCCH 1
+              7,   7,   7,   7, #SDCCH 2
+              7,   7,   7,   7, #SDCCH 3
+            135, 135, 135, 135, #SACCH 2
+            135, 135, 135, 135, #SACCH 3
+              1,   1,   1,   1, #BCCH
+            ], list(dst.get_sub_types()))
+
+        self.assertEqual([
+            0, 0, 0, 0, #BCCH
+            0, 0, 0, 0, #CCCH
+            1, 1, 1, 1, #CCCH
+            2, 2, 2, 2, #CCCH
+            0, 0, 0, 0, #SDCCH 0
+            1, 1, 1, 1, #SDCCH 1
+            2, 2, 2, 2, #SDCCH 2
+            3, 3, 3, 3, #SDCCH 3
+            0, 0, 0, 0, #SACCH 0
+            1, 1, 1, 1, #SACCH 1
+            0, 0, 0, 0, #BCCH
+            0, 0, 0, 0, #CCCH
+            1, 1, 1, 1, #CCCH
+            2, 2, 2, 2, #CCCH
+            0, 0, 0, 0, #SDCCH 0
+            1, 1, 1, 1, #SDCCH 1
+            2, 2, 2, 2, #SDCCH 2
+            3, 3, 3, 3, #SDCCH 3
+            2, 2, 2, 2, #SACCH 2
+            3, 3, 3, 3, #SACCH 3
+            0, 0, 0, 0, #BCCH
+            ], list(dst.get_sub_slots()))
+
+    @unittest.expectedFailure
+    def test_uplink (self):
+        """
+           BCCH_CCCH_SDCCH4 demapper uplink test
+        """
+        src = grgsm.burst_source(test_data.frames, test_data.timeslots, test_data.bursts)
+        src.set_arfcn(0x2240); #uplink flag is 40
+        demapper = grgsm.gsm_bcch_ccch_sdcch4_demapper(timeslot_nr=0)
+        dst = grgsm.burst_sink()
+
+        self.tb.msg_connect(src, "out", demapper, "bursts")
+        self.tb.msg_connect(demapper, "bursts", dst, "in")
+        self.tb.run ()
+
+        b = test_data.bursts
+        self.assertEqual(b, list(dst.get_burst_data()))
+
+        self.assertEqual([
+              7,   7,   7,   7, #SDCCH 3
+              3,   3,           #RACCH
+            135, 135, 135, 135, #SACCH 2
+            135, 135, 135, 135, #SACCH 3
+              3,   3,   3,   3, #RACCH
+              3,   3,   3,   3, #RACCH
+              3,   3,   3,   3, #RACCH
+              3,   3,   3,   3, #RACCH
+              3,   3,   3,   3, #RACCH
+              3,   3,   3,      #RACCH
+              7,   7,   7,   7, #SDCCH 0
+              7,   7,   7,   7, #SDCCH 1
+              3,   3,           #RACCH
+              7,   7,   7,   7, #SDCCH 2
+              7,   7,   7,   7, #SDCCH 3
+              3,   3,           #RACCH
+            135, 135, 135, 135, #SACCH 0
+            135, 135, 135, 135, #SACCH 1
+              3,   3,   3,   3, #RACCH
+              3,   3,   3,   3, #RACCH
+              3,   3,   3,   3, #RACCH
+              3,   3,   3,   3, #RACCH
+              3,   3,   3,   3, #RACCH
+              3,   3,   3,      #RACCH
+              7,   7,   7,   7, #SDCCH 0
+              7,   7,   7,   7, #SDCCH 1
+              3,   3,           #RACCH
+              7,   7,   7,   7, #SDCCH 2
+              7,   7,   7,   7, #SDCCH 3
+              3,   3,           #RACCH
+            ], list(dst.get_sub_types()))
+
+        self.assertEqual([
+            3, 3, 3, 3, #SDCCH 3
+            0, 0,       #RACCH
+            2, 2, 2, 2, #SACCH 2
+            3, 3, 3, 3, #SACCH 3
+            0, 0, 0, 0, #RACCH
+            0, 0, 0, 0, #RACCH
+            0, 0, 0, 0, #RACCH
+            0, 0, 0, 0, #RACCH
+            0, 0, 0, 0, #RACCH
+            0, 0, 0,    #RACCH
+            0, 0, 0, 0, #SDCCH 0
+            1, 1, 1, 1, #SDCCH 1
+            0, 0,       #RACCH
+            2, 2, 2, 2, #SDCCH 2
+            3, 3, 3, 3, #SDCCH 3
+            0, 0,       #RACCH
+            0, 0, 0, 0, #SACCH 0
+            1, 1, 1, 1, #SACCH 1
+            0, 0, 0, 0, #RACCH
+            0, 0, 0, 0, #RACCH
+            0, 0, 0, 0, #RACCH
+            0, 0, 0, 0, #RACCH
+            0, 0, 0, 0, #RACCH
+            0, 0, 0,    #RACCH
+            0, 0, 0, 0, #SDCCH 0
+            1, 1, 1, 1, #SDCCH 1
+            0, 0,       #RACCH
+            2, 2, 2, 2, #SDCCH 2
+            3, 3, 3, 3, #SDCCH 3
+            0, 0,       #RACCH
+            ], list(dst.get_sub_slots()))
+
+if __name__ == '__main__':
+    gr_unittest.run(qa_bcch_ccch_sdcch4_demapper, "qa_bcch_ccch_sdcch4_demapper.xml")
diff --git a/python/qa_gsm_demapper_data.py b/python/qa_gsm_demapper_data.py
new file mode 100644
index 0000000..7554af5
--- /dev/null
+++ b/python/qa_gsm_demapper_data.py
@@ -0,0 +1,26 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# @file
+# @author (C) 2019 by Vasil Velichkov <vvvelichkov@gmail.com>
+# @section LICENSE
+#
+# Gr-gsm 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, or (at your option)
+# any later version.
+#
+# Gr-gsm 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 gr-gsm; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+#
+
+bursts = [format((2**(i+1))-1, '0<148b') for i in range(0,108)]
+frames = range(0, 108)
+timeslots = [0] * len(frames)
diff --git a/python/qa_gsm_sdcch8_demapper.py b/python/qa_gsm_sdcch8_demapper.py
new file mode 100644
index 0000000..83d745c
--- /dev/null
+++ b/python/qa_gsm_sdcch8_demapper.py
@@ -0,0 +1,239 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# @file
+# @author (C) 2019 by Vasil Velichkov <vvvelichkov@gmail.com>
+# @section LICENSE
+#
+# Gr-gsm 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, or (at your option)
+# any later version.
+#
+# Gr-gsm 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 gr-gsm; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+#
+
+import unittest
+import numpy as np
+from gnuradio import gr, gr_unittest, blocks
+import grgsm
+import pmt
+import qa_gsm_demapper_data as test_data
+
+class qa_gsm_sdcch8_demapper (gr_unittest.TestCase):
+
+    def setUp (self):
+        self.tb = gr.top_block ()
+        self.maxDiff = None
+
+    def tearDown (self):
+        self.tb = None
+
+    @unittest.expectedFailure
+    def test_downlink (self):
+        """
+           SDCCH8 demapper downlink test
+        """
+        src = grgsm.burst_source(test_data.frames, test_data.timeslots, test_data.bursts)
+        src.set_arfcn(0); # downlink
+        demapper = grgsm.gsm_sdcch8_demapper(timeslot_nr=0)
+        dst = grgsm.burst_sink()
+
+        self.tb.msg_connect(src, "out", demapper, "bursts")
+        self.tb.msg_connect(demapper, "bursts", dst, "in")
+        self.tb.run ()
+
+        b = test_data.bursts
+        self.assertEqual([
+            b[  0], b[  1], b[  2], b[  3], #SDCCH 0
+            b[  4], b[  5], b[  6], b[  7], #SDCCH 1
+            b[  8], b[  9], b[ 10], b[ 11], #SDCCH 2
+            b[ 12], b[ 13], b[ 14], b[ 15], #SDCCH 3
+            b[ 16], b[ 17], b[ 18], b[ 19], #SDCCH 4
+            b[ 20], b[ 21], b[ 22], b[ 23], #SDCCH 5
+            b[ 24], b[ 25], b[ 26], b[ 27], #SDCCH 6
+            b[ 28], b[ 29], b[ 30], b[ 31], #SDCCH 7
+            b[ 32], b[ 33], b[ 34], b[ 35], #SACCH 0
+            b[ 36], b[ 37], b[ 38], b[ 39], #SACCH 1
+            b[ 40], b[ 41], b[ 42], b[ 43], #SACCH 2
+            b[ 44], b[ 45], b[ 46], b[ 47], #SACCH 3 #skip 48-50
+            b[ 51], b[ 52], b[ 53], b[ 54], #SDCCH 0
+            b[ 55], b[ 56], b[ 57], b[ 58], #SDCCH 1
+            b[ 59], b[ 60], b[ 61], b[ 62], #SDCCH 2
+            b[ 63], b[ 64], b[ 65], b[ 66], #SDCCH 3
+            b[ 67], b[ 68], b[ 69], b[ 70], #SDCCH 4
+            b[ 71], b[ 72], b[ 73], b[ 74], #SDCCH 5
+            b[ 75], b[ 76], b[ 77], b[ 78], #SDCCH 6
+            b[ 79], b[ 80], b[ 81], b[ 82], #SDCCH 7
+            b[ 83], b[ 84], b[ 85], b[ 86], #SACCH 4
+            b[ 87], b[ 88], b[ 89], b[ 90], #SACCH 5
+            b[ 91], b[ 92], b[ 93], b[ 94], #SACCH 6
+            b[ 95], b[ 96], b[ 97], b[ 98], #SACCH 7 #skip 99-101
+            b[102], b[103], b[104], b[105], #SDCCH
+            ], list(dst.get_burst_data()))
+
+        self.assertEqual([
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+            136, 136, 136, 136,
+            136, 136, 136, 136,
+            136, 136, 136, 136,
+            136, 136, 136, 136,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+            136, 136, 136, 136,
+            136, 136, 136, 136,
+            136, 136, 136, 136,
+            136, 136, 136, 136,
+              8,   8,   8,   8,
+            ], list(dst.get_sub_types()))
+
+        self.assertEqual([
+            0, 0, 0, 0,
+            1, 1, 1, 1,
+            2, 2, 2, 2,
+            3, 3, 3, 3,
+            4, 4, 4, 4,
+            5, 5, 5, 5,
+            6, 6, 6, 6,
+            7, 7, 7, 7,
+            0, 0, 0, 0, #SACCH 0
+            1, 1, 1, 1, #SACCH 1
+            2, 2, 2, 2, #SACCH 2
+            3, 3, 3, 3, #SACCH 3
+            0, 0, 0, 0,
+            1, 1, 1, 1,
+            2, 2, 2, 2,
+            3, 3, 3, 3,
+            4, 4, 4, 4,
+            5, 5, 5, 5,
+            6, 6, 6, 6,
+            7, 7, 7, 7,
+            4, 4, 4, 4, #SACCH 4
+            5, 5, 5, 5, #SACCH 5
+            6, 6, 6, 6, #SACCH 6
+            7, 7, 7, 7, #SACCH 7
+            0, 0, 0, 0,
+            ], list(dst.get_sub_slots()))
+
+    @unittest.expectedFailure
+    def test_uplink (self):
+        """
+           BCCH_CCCH_SDCCH4 demapper uplink test
+        """
+        src = grgsm.burst_source(test_data.frames, test_data.timeslots, test_data.bursts)
+        src.set_arfcn(0x2240); #uplink flag is 40
+        demapper = grgsm.gsm_sdcch8_demapper(timeslot_nr=0)
+        dst = grgsm.burst_sink()
+
+        self.tb.msg_connect(src, "out", demapper, "bursts")
+        self.tb.msg_connect(demapper, "bursts", dst, "in")
+        self.tb.run ()
+
+        b = test_data.bursts
+        self.assertEqual([
+            b[  0], b[  1], b[  2], b[  3], #SACCH 5
+            b[  4], b[  5], b[  6], b[  7], #SACCH 6
+            b[  8], b[  9], b[ 10], b[ 11], #SACCH 7 #skip 12-14
+            b[ 15], b[ 16], b[ 17], b[ 18], #SDCCH 0
+            b[ 19], b[ 20], b[ 21], b[ 22], #SDCCH 1
+            b[ 23], b[ 24], b[ 25], b[ 26], #SDCCH 2
+            b[ 27], b[ 28], b[ 29], b[ 30], #SDCCH 3
+            b[ 31], b[ 32], b[ 33], b[ 34], #SDCCH 4
+            b[ 35], b[ 36], b[ 37], b[ 38], #SDCCH 5
+            b[ 39], b[ 40], b[ 41], b[ 42], #SDCCH 6
+            b[ 43], b[ 44], b[ 45], b[ 46], #SDCCH 7
+            b[ 47], b[ 48], b[ 49], b[ 50], #SACCH 0
+            b[ 51], b[ 52], b[ 53], b[ 54], #SACCH 1
+            b[ 55], b[ 56], b[ 57], b[ 58], #SACCH 2
+            b[ 59], b[ 60], b[ 61], b[ 62], #SACCH 3 #skip 63-65
+            b[ 66], b[ 67], b[ 68], b[ 69], #SDCCH 0
+            b[ 70], b[ 71], b[ 72], b[ 73], #SDCCH 1
+            b[ 74], b[ 75], b[ 76], b[ 77], #SDCCH 2
+            b[ 78], b[ 79], b[ 80], b[ 81], #SDCCH 3
+            b[ 82], b[ 83], b[ 84], b[ 85], #SDCCH 4
+            b[ 86], b[ 87], b[ 88], b[ 89], #SDCCH 5
+            b[ 90], b[ 91], b[ 92], b[ 93], #SDCCH 6
+            b[ 94], b[ 95], b[ 96], b[ 97], #SDCCH 7
+            b[ 98], b[ 99], b[100], b[101], #SACCH 4
+            b[102], b[103], b[104], b[105], #SACCH 5
+            ], list(dst.get_burst_data()))
+
+        self.assertEqual([
+            136, 136, 136, 136,
+            136, 136, 136, 136,
+            136, 136, 136, 136,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+            136, 136, 136, 136,
+            136, 136, 136, 136,
+            136, 136, 136, 136,
+            136, 136, 136, 136,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+              8,   8,   8,   8,
+            136, 136, 136, 136,
+            136, 136, 136, 136,
+            ], list(dst.get_sub_types()))
+
+        self.assertEqual([
+            5, 5, 5, 5, #SACCH 5
+            6, 6, 6, 6, #SACCH 6
+            7, 7, 7, 7, #SACCH 7
+            0, 0, 0, 0,
+            1, 1, 1, 1,
+            2, 2, 2, 2,
+            3, 3, 3, 3,
+            4, 4, 4, 4,
+            5, 5, 5, 5,
+            6, 6, 6, 6,
+            7, 7, 7, 7,
+            0, 0, 0, 0, #SACCH 0
+            1, 1, 1, 1, #SACCH 1
+            2, 2, 2, 2, #SACCH 2
+            3, 3, 3, 3, #SACCH 3
+            0, 0, 0, 0,
+            1, 1, 1, 1,
+            2, 2, 2, 2,
+            3, 3, 3, 3,
+            4, 4, 4, 4,
+            5, 5, 5, 5,
+            6, 6, 6, 6,
+            7, 7, 7, 7,
+            4, 4, 4, 4, #SACCH 4
+            5, 5, 5, 5,
+            ], list(dst.get_sub_slots()))
+
+if __name__ == '__main__':
+    gr_unittest.run(qa_gsm_sdcch8_demapper, "qa_gsm_sdcch8_demapper.xml")