diff --git a/tests/v110/test_ra1.c b/tests/v110/test_ra1.c
new file mode 100644
index 0000000..775ec4b
--- /dev/null
+++ b/tests/v110/test_ra1.c
@@ -0,0 +1,71 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <unistd.h>
+
+#include <osmocom/core/bits.h>
+#include <osmocom/isdn/v110.h>
+
+
+static void test_ra1(enum osmo_v100_sync_ra1_rate rate)
+{
+	int user_rate = osmo_v110_sync_ra1_get_user_data_rate(rate);
+	int user_data_chunk_bits = osmo_v110_sync_ra1_get_user_data_chunk_bitlen(rate);
+	struct osmo_v110_decoded_frame fr;
+	ubit_t user_bits[48];
+	ubit_t bits[80];
+	unsigned int i;
+	int rc;
+
+	printf("\n======= User data rate %u\n", user_rate);
+
+	/* we abuse the fact that ubit_t is 8bit so we can actually
+	 * store integer values to clearly identify which bit ends up where */
+	memset(user_bits, 0xFE, sizeof(user_bits));
+	for (i = 0; i < user_data_chunk_bits; i++)
+		user_bits[i] = 101 + i;
+
+	printf("user_bits: ");
+	for (i = 0; i < user_data_chunk_bits; i++)
+		printf("%03d ", user_bits[i]);
+	printf("\n");
+
+	/* generate the decoded v.110 frame */
+	memset(&fr, 0, sizeof(fr));
+	rc = osmo_v110_sync_ra1_user_to_ir(rate, &fr, user_bits, user_data_chunk_bits);
+	OSMO_ASSERT(rc == 0);
+
+	/* run encoder and dump to stdout */
+	memset(bits, 0xff, sizeof(bits));
+	osmo_v110_encode_frame(bits, sizeof(bits), &fr);
+	printf("dumping %u encoded bits in V.110 frame:\n", user_data_chunk_bits);
+	osmo_v110_ubit_dump(stdout, bits, sizeof(bits));
+
+	/* run decoder on what we just encoded */
+	memset(&fr, 0, sizeof(fr));
+	osmo_v110_decode_frame(&fr, bits, sizeof(bits));
+	printf("dumping re-decoded V.110 frame:\n");
+	printf("E-bits: %s\n", osmo_hexdump(fr.e_bits, sizeof(fr.e_bits)));
+	printf("S-bits: %s\n", osmo_hexdump(fr.s_bits, sizeof(fr.s_bits)));
+
+	/* re-encode and dump again 'expout' will match it. */
+	memset(user_bits, 0xff, sizeof(user_bits));
+	rc = osmo_v110_sync_ra1_ir_to_user(rate, user_bits, sizeof(user_bits), &fr);
+	if (rc != user_data_chunk_bits) {
+		fprintf(stderr, "ERROR: adapt_ir_to_user() returned %d, expected %u\n", rc,
+			user_data_chunk_bits);
+		exit(23);
+	}
+	fprintf(stdout, "re-decoded user bits: ");
+	for (i = 0; i < user_data_chunk_bits; i++)
+		printf("%03d ", user_bits[i]);
+	printf("\n");
+}
+
+
+int main(int argc, char **argv)
+{
+	for (int i = 0; i < _NUM_OSMO_V110_SYNC_RA1; i++)
+		test_ra1(i);
+}
+