diff --git a/applications/apertif/designs/apertif_unb1_correlator/src/vhdl/node_apertif_unb1_correlator_output.vhd b/applications/apertif/designs/apertif_unb1_correlator/src/vhdl/node_apertif_unb1_correlator_output.vhd
index fb4ca683fe4550871052b1aabbfd67e897934b16..cc31233b1f0dc00b10fe725ce73c66f8b9062e32 100644
--- a/applications/apertif/designs/apertif_unb1_correlator/src/vhdl/node_apertif_unb1_correlator_output.vhd
+++ b/applications/apertif/designs/apertif_unb1_correlator/src/vhdl/node_apertif_unb1_correlator_output.vhd
@@ -40,30 +40,35 @@ USE tech_tse_lib.tb_tech_tse_pkg.ALL;
 
 ENTITY node_apertif_unb1_correlator_output IS
   GENERIC (
-    g_nof_visibilities : NATURAL;
-    g_cor_out_dat_w    : NATURAL
+    g_nof_visibilities             : NATURAL;
+    g_cor_out_dat_w                : NATURAL
   );
   PORT (
-    mm_rst                : IN  STD_LOGIC;
-    mm_clk                : IN  STD_LOGIC;
-    dp_rst                : IN  STD_LOGIC;
-    dp_clk                : IN  STD_LOGIC;
- 
-    snk_in                : IN  t_dp_sosi;
-                       
-    src_out               : OUT t_dp_sosi;  
-    src_in                : IN  t_dp_siso; 
+    mm_rst                         : IN  STD_LOGIC;
+    mm_clk                         : IN  STD_LOGIC;
+    dp_rst                         : IN  STD_LOGIC;
+    dp_clk                         : IN  STD_LOGIC;
+                                   
+    snk_in                         : IN  t_dp_sosi;
+                                   
+    src_out                        : OUT t_dp_sosi;  
+    src_in                         : IN  t_dp_siso; 
                                         
     reg_dp_offload_tx_hdr_dat_mosi : IN  t_mem_mosi;
-    reg_dp_offload_tx_hdr_dat_miso : OUT t_mem_miso;     
-
+    reg_dp_offload_tx_hdr_dat_miso : OUT t_mem_miso;   
+    
+    reg_dp_xonoff_output_mosi      : IN  t_mem_mosi;   
+    reg_dp_xonoff_output_miso      : OUT t_mem_miso;   
+    
     ID                             : IN STD_LOGIC_VECTOR(c_unb1_board_aux.id_w-1 DOWNTO 0)    
   );
 END node_apertif_unb1_correlator_output;
 
 ARCHITECTURE str OF node_apertif_unb1_correlator_output IS
 
-  -- 1GbE Visibility Offload
+  -- 1GbE Visibility Offload  
+  SIGNAL dp_xonoff_snk_in_arr                        : t_dp_sosi_arr(1-1 DOWNTO 0);
+  SIGNAL dp_xonoff_src_out_arr                       : t_dp_sosi_arr(1-1 DOWNTO 0);
   SIGNAL dp_fifo_sc_snk_in                           : t_dp_sosi;
   SIGNAL dp_repack_data_snk_in                       : t_dp_sosi;
   SIGNAL dp_repack_data_snk_out                      : t_dp_siso;
@@ -73,6 +78,34 @@ ARCHITECTURE str OF node_apertif_unb1_correlator_output IS
   SIGNAL dp_offload_tx_src_in_arr                    : t_dp_siso_arr(1-1 DOWNTO 0);                                
 
 BEGIN
+    
+  dp_xonoff_snk_in_arr(0) <= snk_in;
+  -----------------------------------------------------------------------------
+  -- DP Xon Off. --> output to the datawriter can be switched on or off. 
+  -----------------------------------------------------------------------------  
+  u_mms_dp_xonoff : ENTITY dp_lib.mms_dp_xonoff 
+  GENERIC MAP(
+    g_nof_streams     => 1,
+    g_combine_streams => TRUE,
+    g_bypass          => FALSE,
+    g_default_value   => '0'
+  )
+  PORT MAP(
+    mm_rst       => mm_rst,
+    mm_clk       => mm_clk,
+
+    reg_mosi     => reg_dp_xonoff_output_mosi,
+    reg_miso     => reg_dp_xonoff_output_miso,
+    
+    dp_rst       => dp_rst,  
+    dp_clk       => dp_clk,  
+
+    snk_out_arr  => OPEN,
+    snk_in_arr   => dp_xonoff_snk_in_arr, 
+
+    src_in_arr   => (OTHERS => c_dp_siso_rdy), 
+    src_out_arr  => dp_xonoff_src_out_arr
+  );
 
   -----------------------------------------------------------------------------
   -- 64b -> 32b 
@@ -91,7 +124,7 @@ BEGIN
     rst         => dp_rst,
     clk         => dp_clk,
   
-    snk_in      => snk_in,
+    snk_in      => dp_xonoff_src_out_arr(0),
 
     src_in      => dp_repack_data_snk_out,
     src_out     => dp_repack_data_snk_in