diff --git a/doc/devices/SWTG024AS.md b/doc/devices/SWTG024AS.md
index 5c7e40a..6554e7b 100644
--- a/doc/devices/SWTG024AS.md
+++ b/doc/devices/SWTG024AS.md
@@ -34,6 +34,12 @@ Changes I found with my board vs [Managed version](https://github.com/up-n-atom/
   We need to make a `Best`-BOM variant so we can use all the featues.
 
 # Connectors
+
+## J4
+
+* Location: Left SFP connector `J4`.
+* Connected to: 10GMAC number 8, second SDS.
+
 |`J4` SFP1 PINs | Signal | Component | GPIO | Notes |
 |---|---|---|---|---|
 |2|	TX_FAULT	        | B-R262	       | --- | | 
@@ -45,6 +51,11 @@ Changes I found with my board vs [Managed version](https://github.com/up-n-atom/
 |8|	LOS	              | B-R258, T-R270 | GPIO37 | | 
 |9|	TO?               | B-R256	       | ---    | |
 
+## J2
+
+* Location: Right SFP connector `J2`.
+* Connected to: 10GMAC number 3, first SDS.
+
 |`J2` SFP2 PINs | Signal | Component | GPIO | Notes |
 |---|---|---|---|---|
 |2|	TX_FAULT	        | B-R70	         | ---	  | |
diff --git a/machine.c b/machine.c
index d82e507..d0275a1 100644
--- a/machine.c
+++ b/machine.c
@@ -60,14 +60,16 @@ __code const struct machine machine = {
 	.log_to_phys_port = {0, 0, 0, 6, 1, 2, 3, 4, 5},
 	.phys_to_log_port = {4, 6, 5, 7, 3, 8, 0, 0, 0},
 	.is_sfp= {0, 0, 0, 2, 0, 0, 0, 0, 1},
+	// Left SFP port (J4)
 	.sfp_port[0].pin_detect = 30,
 	.sfp_port[0].pin_los = 37,
-	.sfp_port[0].sds = 0,
-	.sfp_port[0].i2c = 0,
+	.sfp_port[0].sds = 1,
+	.sfp_port[0].i2c = 0, /* GPIO 39 */
+	// Right SFP port (J2)
 	.sfp_port[1].pin_detect = 50,
 	.sfp_port[1].pin_los = 51,
-	.sfp_port[1].sds = 1,
-	.sfp_port[1].i2c = 1,
+	.sfp_port[1].sds = 0,
+	.sfp_port[1].i2c = 1, /* GPIO 40 */
 	.reset_pin = 36,
 };
 #elif defined DEFAULT_8C_1SFP