diff --git a/designs/reflectometer_base/Makefile b/designs/reflectometer_base/Makefile
index 1c3fe92..caa7662 100644
--- a/designs/reflectometer_base/Makefile
+++ b/designs/reflectometer_base/Makefile
@@ -17,6 +17,7 @@ RTL_DIR = ../../rtl
 include ../../scripts/vivado.mk
 
 SYN_FILES += reflectometer.sv
+SYN_FILES += tb_reflectometer.sv
 SYN_FILES += $(sort $(shell find ../../rtl -type f \( -name '*.v' -o -name '*.sv' \)))
 
 XCI_FILES = $(sort $(shell find ../../rtl/ethernet-udp/src -type f -name '*.xci'))
diff --git a/designs/reflectometer_base/tb_reflectometer.sv b/designs/reflectometer_base/tb_reflectometer.sv
new file mode 100644
index 0000000..02d9c00
--- /dev/null
+++ b/designs/reflectometer_base/tb_reflectometer.sv
@@ -0,0 +1,139 @@
+`timescale 1ns / 1ps
+
+module tb_reflectometer;
+
+    // parameters
+    localparam int unsigned DAC_DATA_WIDTH = 14;
+    localparam int unsigned ADC_DATA_WIDTH = 12;
+    localparam PACK_FACTOR = 1;     // not used in TB
+    localparam PROCESS_MODE = 0;    // 0 - uint, 1 - int
+    localparam ZERO_LEVEL = 8192;   // DAC zero voltage representation (2^14 / 2)
+    localparam ACCUM_WIDTH = 32;    // accumulator number bit witdth
+    localparam N_MAX = 4096;        // max value of windows to average by experiments
+    localparam WINDOW_SIZE = 65;    // fixed subwindow size to average by time
+    localparam PACKET_SIZE = 1024;  // bytes per UDP packet
+    
+    // DUT signals
+    logic clk200, clk_eth_phy_tx, clk_eth_phy_rx;
+    logic rst_n;
+    wire [3:0] status_leds; // [ None, dac_start, m_axis_valid, clk_wiz_locked ]
+
+    wire dac_clk, dac_en;
+    wire [DAC_DATA_WIDTH-1:0] dac_data;
+    wire adc_clk;
+    logic adc_otr;
+    logic [ADC_DATA_WIDTH-1:0] adc_data;
+
+    wire [7:0]  s_axis_tx_tdata;
+    wire        s_axis_tx_tvalid;
+    logic        s_axis_tx_tready;
+    wire        s_axis_tx_tlast;
+    
+    logic       phy_ready;
+    wire        accum_tx_start;
+    logic [7:0]  m_axis_rx_tdata;
+    logic        m_axis_rx_tvalid;
+    logic        m_axis_rx_tlast;
+    wire        m_axis_rx_tready;
+
+    // DUT
+    reflectometer_top #(
+        .DAC_DATA_WIDTH(DAC_DATA_WIDTH),
+        .ADC_DATA_WIDTH(ADC_DATA_WIDTH),
+        .PACK_FACTOR(PACK_FACTOR),
+        .PROCESS_MODE(PROCESS_MODE),
+        .ZERO_LEVEL(ZERO_LEVEL),
+        .ACCUM_WIDTH(ACCUM_WIDTH),
+        .N_MAX(N_MAX),
+        .WINDOW_SIZE(WINDOW_SIZE),
+        .PACKET_SIZE(PACKET_SIZE)
+    ) DUT (
+        .sys_clk(clk200),                  // main clk 200 mhz
+        .rst_n(rst_n),                     // rst_n
+        .led(status_leds),                 // indication [3:0]
+        .gmii_rx_clk(clk_eth_phy_rx),      // ext. clk from PHY
+        .gmii_tx_clk(clk_eth_phy_tx),      // ext. clk from PHY
+        // accumulated data stream
+        .s_axis_tx_tdata(s_axis_tx_tdata),  
+        .s_axis_tx_tvalid(s_axis_tx_tvalid), 
+        .s_axis_tx_tready(s_axis_tx_tready), 
+        .s_axis_tx_tlast(s_axis_tx_tlast),  
+        // controller data stream
+        .m_axis_rx_tdata(m_axis_rx_tdata), 
+        .m_axis_rx_tvalid(m_axis_rx_tvalid), 
+        .m_axis_rx_tlast(m_axis_rx_tlast),  
+        .m_axis_rx_tready(m_axis_rx_tready), 
+        
+        .req_ready(phy_ready),        // AXI-stream requester ready
+        .send_req(accum_tx_start),         // AXI-stream start transmit
+        .p2_clk(dac_clk),           // DAC clk
+        .p2_data(dac_data),          // DAC [DAC_DATA_WIDTH-1:0] data
+        .p2_wrt(dac_en),           // DAC write enable
+        .ch2_clk(adc_clk),          // ADC clk
+        .ch2_data(adc_data),         // ADC [ADC_DATA_WIDTH-1:0] data
+        .ch2_otr(adc_otr)           // ADC signal out-of-range
+    );
+
+    // clocks
+    initial begin
+        // 200 MHz    
+        clk200 = 1'b0;
+        forever #2.5 clk200 = ~clk200;
+    end
+    initial begin
+        // 125 MHz
+        clk_eth_phy_tx = 1'b0;
+        forever #4 clk_eth_phy_tx = ~clk_eth_phy_tx;
+    end
+    initial begin
+        // 125 MHz
+        clk_eth_phy_rx = 1'b0;
+        forever #4 clk_eth_phy_rx = ~clk_eth_phy_rx;
+    end
+
+    // ADC input noise simulation
+    always @(posedge adc_clk or negedge rst_n) begin
+        if (!rst_n) begin
+            adc_data <= '0; 
+        end else begin
+            adc_data <= $urandom() & ((1 << ADC_DATA_WIDTH) - 1);
+        end
+    end
+    assign adc_otr = 1'b0;
+
+    // some helpers for controller axis
+    
+    // GAME PLAN
+    // 1. setup reflectometer
+    // 2. create some reference signal with noise + virtual ADC
+    // 3. setup m_axis endpoint for controller to start reflectometer (create multiple tasks)
+    // 4. setup s_axis endpoint for data gathering and plotting
+    // 5. check standalone reflectometer
+    // 6. add reference signal averaging loop throw generator pulse posedge detection
+    // 7. visual comparision of reference VS reflectometer
+    // 8. add statistics for signal comparision (MSE/RMSE)  
+    
+    // main TB
+    initial begin
+        // setup
+        rst_n = 1'b0;
+        s_axis_tx_tready = 1'b0;
+        m_axis_rx_tdata = 1'b0;
+        m_axis_rx_tvalid = 1'b0;
+        m_axis_rx_tlast = 1'b0;
+        phy_ready = 1'b0;
+        
+        // startup
+        #100;
+        rst_n = 1'b1;
+        wait(DUT.clk_wiz_ctrl_inst.locked == 1'b1);
+        #20;
+        $display("=== clocks ready / wiz. locked ===");
+        #40;
+        
+        
+        
+        $display("=== ALL BASIC TESTS PASSED ===");
+        $finish;
+    end
+endmodule
\ No newline at end of file