What are the pinouts for the Digi CM/Passport loopback plug?

The following loopback pinouts apply to the Digi CM and Digi Passport product lines:

RJ45 Looback
=======              =======
1 CTS                      8 RTS
2 DSR and DCD     7 DTR
3 RxD                      6 TxD
4 GND                     4 GND