Standard tracking cable used with SBIG cameras.
Use this to connect the guide port on your SBIG camera to the guide input port on your telescope mount.
This is a “flipped” cable, the standard for telephone-style cable wiring, where the left-most conductor on one end becomes the right-most conductor on the opposite end. It has the 6p6c RJ-12 style modular telephone connector.
When people refer to the “ST-4” guider port or more correctly “SG-4” port, this is the cable that fits the port.