Western Electric WE310 is the classic modular telephone handset cord connector used on North American telephone handsets before RJ9/RJ22 became the standard modern handset connector.
| Pin | Name | Function | Type |
|---|---|---|---|
| 1 | L1 | Line 1 tip | BUS |
| 2 | L2 | Line 1 ring | BUS |
| 3 | GND | Ground | GND |
| 4 | SPARE | Spare contact | I/O |