4 pin mini-DIN female connector
The Thomson SpeedTouch 605 is an ADSL2/2+ business DSL router with 16 MB flash and 32 MB SDRAM, offering one RJ-11 WAN port and four RJ-45 10/100Base-T LAN ports. It carries a 4-pin mini-DIN female connector that functions as an undocumented console serial port, absent from the official hardware specification. The port exposes TxD, RxD, and GND signals and may serve as a maintenance or debug interface. Pin 4 function is not publicly documented. This port may also be present on other Thomson SpeedTouch DSL modem and router models.
| Pin | Name | Description |
|---|---|---|
| 1 | TxD | Serial Transmit (Router -> PC) |
| 2 | RxD | Serial Receive (PC -> Router) |
| 3 | GND | Ground |
| 4 | nc | ?? |
Notes
- This console port is not described in the official Thomson SpeedTouch 605/608/608 WL/620 user manual; it is an undocumented hardware interface.
- Pin 4 function unknown.
- May also be present on other Thomson SpeedTouch DSL modems and routers.
Signals
- TxD — serial data transmitted from the router to the PC
- RxD — serial data received by the router from the PC
- GND — signal ground
- nc — function unknown
References
- SpeedTouch 605/608/608 WL/620 Manual — Thomson official user manual for the SpeedTouch 605 series (Internet Archive)