Jay Hennigan <j...@west.net> writes: > On 9/24/24 00:33, Bjørn Mork via NANOG wrote: > >> You could get a Netra T1 with RJ45 serial ports, using Sun/Cisco pinout, >> 25 years ago. And we're still struggling with DB9 connectors. Why? > > Sun and Cisco 8-pin modular serial pinouts are very different. > > (Pedantic nit to pick - not all 8-pin modular jacks are RJ-45.)
No, no, no. We can have fun for a long time with this :-) You can find the Netra T1 105 serial pinout on page 56 in the User and Administration Guide (thanks Oracle for keeping that available!): https://docs.oracle.com/cd/E19957-01/806-4707/806-4707.pdf Here's the table for convenience: TABLE 6-3 Pin Cross-overs for a DB9 (9-pin) Adapter Serial Port (RJ45 Connector) Pin 9-pin Connector Pin 1 (RTS) Pin 8 (CTS) Pin 2 (DTR) Pin 6 (DSR) Pin 3 (TXD) Pin 2 (RXD) Pin 4 (Signal Ground) Pin 5 (Signal Ground) Pin 5 (Signal Ground) Pin 5 (Signal Ground) Pin 6 (RXD) Pin 3 (TXD) Pin 7 (DSR) Pin 4 (DTR) Pin 8 (CTS) Pin 7 (RTS) The Cisco pinout is of course all over the place. One example: https://www.cisco.com/c/en/us/td/docs/wireless/asr_901/Hardware/Guide/HW_Guide/HW_cable.pdf On page B-4 we have: Cable B-3 Console Port Pinouts Pin Signal Name HP Pins Direction Description 1 RTS UART_RTS1 Output Request to send 2 DTR NC 3 TXD UART_SOUT1 Output Transmit data 4 RI GND Ring indicator 5 GND GND 6 RXD UART_SIN1 Input Receive data 7 DSR/DCD NC Input Data set ready/Data Carrier detect 8 CTS UART_CTS1 Input Clear to send Bjørn
