COURIER HIGH SPEED MODEMS
Xmodem | Throughput may be reduced if your version |
| uses short block lengths (128 bytes). Some |
| versions use larger blocks (1K blocks). |
| Throughput is also reduced by overhead |
| (error control protocol information). |
Ymodem | There is an improvement over Xmodem, due |
| to larger block lengths (1K bytes), but |
| throughput is still reduced by the protocol's |
| error control overhead. |
The above protocols further reduce throughput when an error control connection is established. The accuracy of the data is checked both by the file transfer protocol and the modem. To avoid redundancy, use the above protocols only for
For the best throughput, but on
Typical Throughput
The maximum connection rate between two V.34 modems is 28.8K bps. Ocassionally, connections occur at 26.4K, 24K, and 21.6K bps because line quality differs from location to location Line conditions and data rate affect throughput. Also remember, your serial port rate must match or exceed your connection rate. If you set your serial port rate at 19.2K bps, the V.34 modem will only connect at or below 19.2K bps.