
44CHAPTER 5: USING THE MODEM
S42 
Bit 0. Length field in 
■0 do not indicate break signal length in UI frame.
■1 indicate break length in L_SIGNAL (UI) frames
Bit 1. Break handling option 2 (V.25ter only)
| ■ 0 ignore breaks from DTE | |
| ■ 1 process break (bits  | |
| Bits  | |
| ■ 00 Discard all buffered data immediately | |
| ■ 01 Attempt until all data is delivered | |
| ■ 10 Attempt until all data is delivered or timer expires (timer is set by S38) | |
| Bits  | |
| ■ 00 Discard all buffered data immediately | |
| ■ 10 Attempt until all data is delivered or timer expires (timer is set by S38) | |
| ■ 01 Attempt until all data is delivered | |
| Bits  | |
| ■ | 00 No compression | 
| ■ | 10 Decompression only | 
| ■ | 01 Compression only | 
| ■ | 11 Both direction | 
| 
 | |
| S43 Break length transmitted to DTE when not specified in UI frame (in 10 ms) (V.25ter | |
| only). Default = 30. Nonstorable. | |
| 
 | |
| S44 Error Correction in Use. Nonstorable. | |
| ■ 0 = No error correction | |
| ■ 5 = MNP class 5 | |
| ■ 2 = MNP class 2 | |
| ■ | 6 = V.42 | 
| ■ 3 = MNP class 3 | |
| ■ 7 = V.42 bis | |
| ■ 4 = MNP class 4 | |
| ■ 8 = V.42bis over an MNP link | |
| 
 | |
| S45 Reserved for internal use. Nonstorable. | |
| 
 | |
| S46 Fallback Character For Error Correction Negotiation. Value: 0 - 127. Default 13 (ASCII | |
| CR). Storable. | |
| 
 | |
| S47 XON Character. Value: 0 - 127. Default = 17. Storable. | |
| 
 | |
| S48 XOFF Character. Value: 0 - 127. Default = 19. Storable. | |
