
| Short Form | Long Form | 
 | n Value in ATXn Command | 
 | Notes | ||||
| 0 | 
 | 1 | 2 | 3 | 
 | 4 | |||
| 
 | 
 | 
 | 
 | 
 | |||||
| 57 | Carrier 26400 | x | 
 | x | x | x | 
 | x | 
 | 
| 58 | Carrier 28800 | x | 
 | x | x | x | 
 | x | 
 | 
| 59 | Connect 16800 | 1 | 
 | x | x | x | 
 | x | 
 | 
| 61 | Connect 21600 | 1 | 
 | x | x | x | 
 | x | 
 | 
| 62 | Connect 24000 | 1 | 
 | x | x | x | 
 | x | 
 | 
| 63 | Connect 26400 | 1 | 
 | x | x | x | 
 | x | 
 | 
| 64 | Connect 28800 | 1 | 
 | x | x | x | 
 | x | 
 | 
| 66 | Compression: Class 5 | x | 
 | x | x | x | 
 | x | 
 | 
| 67 | Compression: V.42bis | x | 
 | x | x | x | 
 | x | 
 | 
| 69 | Compression: None | x | 
 | x | x | x | 
 | x | 
 | 
| 70 | Protocol: None | x | 
 | x | x | x | 
 | x | 
 | 
| 77 | Protocol: LAPM | x | 
 | x | x | x | 
 | x | 
 | 
| 78 | Carrier 31200 | x | 
 | x | x | x | 
 | x | 
 | 
| 79 | Carrier 33600 | x | 
 | x | x | x | 
 | x | 
 | 
| 80 | Protocol: ALT | x | 
 | x | x | x | 
 | x | 
 | 
| 81 | Protocol:  | x | 
 | x | x | x | 
 | x | 
 | 
| 84 | Connect 33600 | 1 | 
 | x | x | x | 
 | x | 
 | 
| 91 | Connect 31200 | 1 | 
 | x | x | x | 
 | x | 
 | 
| 150 | Carrier 32000 | x | 
 | x | x | x | 
 | x | 
 | 
| 151 | Carrier 34000 | x | 
 | x | x | x | 
 | x | 
 | 
| 152 | Carrier 36000 | x | 
 | x | x | x | 
 | x | 
 | 
| 153 | Carrier 38000 | x | 
 | x | x | x | 
 | x | 
 | 
| 154 | Carrier 40000 | x | 
 | x | x | x | 
 | x | 
 | 
| 155 | Carrier 42000 | x | 
 | x | x | x | 
 | x | 
 | 
| 156 | Carrier 44000 | x | 
 | x | x | x | 
 | x | 
 | 
| 157 | Carrier 46000 | x | 
 | x | x | x | 
 | x | 
 | 
| 158 | Carrier 48000 | x | 
 | x | x | x | 
 | x | 
 | 
| 159 | Carrier 50000 | x | 
 | x | x | x | 
 | x | 
 | 
| 160 | Carrier 52000 | x | 
 | x | x | x | 
 | x | 
 | 
| 161 | Carrier 52000 | x | 
 | x | x | x | 
 | x | 
 | 
| 162 | Carrier 56000 | x | 
 | x | x | x | 
 | x | 
 | 
| 165 | Connect 32000 | x | 
 | x | x | x | 
 | x | 
 | 
| 166 | Connect 34000 | x | 
 | x | x | x | 
 | x | 
 | 
| 167 | Connect 36000 | x | 
 | x | x | x | 
 | x | 
 | 
| 168 | Connect 38000 | x | 
 | x | x | x | 
 | x | 
 | 
| 169 | Connect 40000 | x | 
 | x | x | x | 
 | x | 
 | 
| 170 | Connect 42000 | x | 
 | x | x | x | 
 | x | 
 | 
| 171 | Connect 44000 | x | 
 | x | x | x | 
 | x | 
 | 
| 172 | Connect 46000 | x | 
 | x | x | x | 
 | x | 
 | 
| 173 | Connect 48000 | x | 
 | x | x | x | 
 | x | 
 | 
| 174 | Connect 50000 | x | 
 | x | x | x | 
 | x | 
 | 
| 175 | Connect 52000 | x | 
 | x | x | x | 
 | x | 
 | 
| 176 | Connect 54000 | x | 
 | x | x | x | 
 | x | 
 | 
| 177 | Connect 56000 | x | 
 | x | x | x | 
 | x | 
 | 
| +F4 | +FCERROR | x | 
 | x | x | x | 
 | x | 
 | 
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