diff --git a/src/Makefile.am b/src/Makefile.am
index 92ea30bb..e2f14968 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -136,6 +136,8 @@ utun_CORE_SOURCES = \
 	proxy/proxy_protocol.h \
 	proxy/tcp_proxy_client.c \
 	routing_layer/etcp_router.c \
+	routing_layer/route_tx_stats.c \
+	routing_layer/route_tx_stats.h \
 	routing_layer/route_crypto.c \
 	proxy/tcp_proxy_server.c \
 	proxy/udp_proxy.c \
@@ -286,6 +288,8 @@ libutun_a_SOURCES = \
 	proxy/proxy_protocol.h \
 	proxy/tcp_proxy_client.c \
 	routing_layer/etcp_router.c \
+	routing_layer/route_tx_stats.c \
+	routing_layer/route_tx_stats.h \
 	routing_layer/route_crypto.c \
 	proxy/tcp_proxy_server.c \
 	proxy/udp_proxy.c \
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 80522f4e..5e96ee75 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -9,6 +9,7 @@ EXTRA_DIST = fixtures/reality_openssl_hello.hex data/silero_speech.pcm data/sile
 
 # Быстрые проверки (до 100мс).
 check_PROGRAMS = \
+    test_route_tx_stats \
     test_memory_pool_and_config \
     test_serialize \
     test_reed_solomon \
@@ -673,6 +674,8 @@ test_dm_worker_CFLAGS = $(test_dm_e2e_CFLAGS)
 test_dm_worker_LDADD = $(LIBUTUN) $(CRYPTO_LIBS) $(COMMON_LIBS)
 
 test_call_SOURCES = test_call.c
+test_route_tx_stats_SOURCES = test_route_tx_stats.c
+test_route_tx_stats_LDADD = $(LIBUTUN) $(COMMON_LIBS)
 test_call_CFLAGS = -I$(top_srcdir)/src -I$(top_srcdir)/src/chat -I$(top_srcdir)/src/dm -I$(top_srcdir)/src/call -I$(top_srcdir)/src/routing_layer -I$(top_srcdir)/src/transport_layer -I$(top_srcdir)/lib
 test_call_LDADD = $(LIBUTUN) $(CRYPTO_LIBS) $(COMMON_LIBS)
 
diff --git a/tests/test_route_tx_stats.c b/tests/test_route_tx_stats.c
new file mode 100644
index 00000000..ae6f495f
--- /dev/null
+++ b/tests/test_route_tx_stats.c
@@ -0,0 +1,34 @@
+/* Границы 50мс, неполное окно, пачки ACK, простой и новая эпоха доставки. */
+#include <stdlib.h>
+#include <string.h>
+#include "../src/routing_layer/route_tx_stats.h"
+#include "../lib/debug_config.h"
+
+#define CHECK(x) do { if (!(x)) { DEBUG_ERROR(DEBUG_CATEGORY_ETCPROUTE, "TX meter test line=%d: %s", __LINE__, #x); exit(1); } } while (0)
+
+int main(void) {
+    debug_config_init(); debug_set_level(DEBUG_LEVEL_INFO);
+    struct route_tx_meter meter;
+    struct route_tx_window out;
+    route_tx_meter_reset(&meter, 0);
+    for (unsigned i = 0; i < 10; i++) CHECK(route_tx_meter_ack(&meter, i * 50000 + 49999, i + 1) == 0);
+    CHECK(route_tx_meter_window(&meter, 499999, &out) == 0 && !out.valid && out.bytes == 45);
+    CHECK(route_tx_meter_window(&meter, 500000, &out) == 0 && out.valid && out.bytes == 55 && out.packets == 10);
+    CHECK(route_tx_meter_ack(&meter, 500000, 100) == 0);
+    CHECK(route_tx_meter_window(&meter, 549999, &out) == 0 && out.bytes == 55 && out.end_us == 500000);
+    CHECK(route_tx_meter_window(&meter, 550000, &out) == 0 && out.bytes == 154 && out.packets == 10);
+    CHECK(route_tx_meter_window(&meter, 1050000, &out) == 0 && out.bytes == 0 && meter.bytes == 155);
+    CHECK(route_tx_meter_ack(&meter, 2000000, 200) == 0);
+    CHECK(route_tx_meter_ack(&meter, 2000000, 300) == 0);
+    CHECK(route_tx_meter_window(&meter, 2050000, &out) == 0 && out.bytes == 500 && out.packets == 2);
+    route_tx_meter_reset(&meter, 2075000);
+    CHECK(route_tx_meter_window(&meter, 2550000, &out) == 0 && !out.valid && out.bytes == 0 && !meter.bytes);
+    CHECK(route_tx_meter_window(&meter, 2600000, &out) == 0 && out.valid && !out.packets);
+    CHECK(route_tx_meter_ack(&meter, 2600000, 123) == 0);
+    struct route_tx_meter saved = meter;
+    CHECK(route_tx_meter_ack(&meter, 2599999, 1) == -1 && memcmp(&saved, &meter, sizeof(meter)) == 0);
+    CHECK(route_tx_meter_ack(&meter, 2600000, UINT64_MAX) == -1 && memcmp(&saved, &meter, sizeof(meter)) == 0);
+    CHECK(route_tx_meter_window(&meter, 2650000, &out) == 0 && out.bytes == 123 && out.packets == 1);
+    DEBUG_INFO(DEBUG_CATEGORY_ETCPROUTE, "PASS TX meter: 500ms/50ms, boundary, ACK burst, idle, reset, invalid input");
+    return 0;
+}