diff --git a/firmware/libcommon/include/iso7816_fidi.h b/firmware/libcommon/include/iso7816_fidi.h
index e4690a5..3b4b451 100644
--- a/firmware/libcommon/include/iso7816_fidi.h
+++ b/firmware/libcommon/include/iso7816_fidi.h
@@ -2,5 +2,11 @@
 
 #include <stdint.h>
 
+/* Table 7 of ISO 7816-3:2006 */
+extern const uint16_t fi_table[];
+
+/* Table 8 from ISO 7816-3:2006 */
+extern const uint8_t di_table[];
+
 /* compute the F/D ratio based on Fi and Di values */
 int compute_fidi_ratio(uint8_t fi, uint8_t di);
diff --git a/firmware/libcommon/source/iso7816_fidi.c b/firmware/libcommon/source/iso7816_fidi.c
index b35f068..bdccd55 100644
--- a/firmware/libcommon/source/iso7816_fidi.c
+++ b/firmware/libcommon/source/iso7816_fidi.c
@@ -24,13 +24,13 @@
 #include "iso7816_fidi.h"
 
 /* Table 7 of ISO 7816-3:2006 */
-static const uint16_t fi_table[] = {
+const uint16_t fi_table[] = {
 	372, 372, 558, 744, 1116, 1488, 1860, 0,
 	0, 512, 768, 1024, 1536, 2048, 0, 0
 };
 
 /* Table 8 from ISO 7816-3:2006 */
-static const uint8_t di_table[] = {
+const uint8_t di_table[] = {
 	0, 1, 2, 4, 8, 16, 32, 64,
 	12, 20, 2, 4, 8, 16, 32, 64,
 };
diff --git a/firmware/libcommon/source/sniffer.c b/firmware/libcommon/source/sniffer.c
index 27f102d..fe550ea 100644
--- a/firmware/libcommon/source/sniffer.c
+++ b/firmware/libcommon/source/sniffer.c
@@ -565,7 +565,7 @@
 					fn = 1;
 					dn = 1;
 				}
-				TRACE_INFO("PPS negotiation successful: Fn=%u Dn=%u\n\r", fn, dn);
+				TRACE_INFO("PPS negotiation successful: Fn=%u Dn=%u\n\r", fi_table[fn], di_table[dn]);
 				update_fidi(&sniff_usart, pps_cur[2]);
 				usb_send_fidi(pps_cur[2]); /* send Fi/Di change notification to host software over USB */
 			} else { /* checksum is invalid */