Specification for RJ9
| Electrical mounting | THT |
| Connector | plug |
| Mechanical mounting | on PCBs |
| Contact plating | gold-plated |
| Type of connector | RJ9 |
| Number of pins | 4 |
| Contact material | phosphor bronze |
| Type of pin configuration | 4p4c |
| Ethernet category | Cat 3 |
| Connector variant | unshielded |
| Spatial orientation | straight |