VT100.net: Digital VT102 User Guide

Table 6-2 Possible Bell Modem Configurations (Dedicated Line)
Communication Parameters | Modem | Line Conditioning | Reverse Channel
--- | --- | --- | ---
300 baud Full-duplex 2-wire | 103F | Unconditioned 3002 channel | No
1200 baud Half-duplex 2-wire | 202T | With reverse channel, up to 1200 baud on unconditioned or C2 conditioned 3002 channel. Without reverse channel, up to 1200 baud on unconditioned 3002 channel and 1200 to 1800 baud on C2 conditioned channel. | Yes
1200 baud Full-duplex 4-wire | 202T | Without reverse channel, up to 1200 baud on unconditioned 3002 channel and 1200 to 1800 baud on C2 conditioned channel. | No