VT100.net: Digital VT102 User Guide

Table 6-1 Possible Bell Modem Configurations (Public Switched)
Communication Parameters | Manual Originate Only | Manual Answer Only | Manual Originate/ Answer | Auto Answer | Reverse Channel
--- | --- | --- | --- | --- | ---
300 baud Full-duplex 2-wire | 113A | 113D | 103A | 103A | No
113C |  | 103J | 103J | No
|  | 212A | 113B | No
|  |  | 113D | No
|  |  | 212A | No
1200 baud Half-duplex 2-wire |  |  | 202S | 202S | Yes
1200 baud Full-duplex 2-wire |  |  | 212A | 212A | No