COURIER HIGH SPEED MODEMS
The tables below indicate the typical throughput, in characters per second (cps), that can be expected under the following conditions.
•Connection (link) rates of 14.4K, 21.6K, and 28.8K bps, respectively
•Serial port rates set at 57.6K bps for the 14.4K bps connection and 115.2K bps for the 21.6K and 28.8K bps connections
•Modem set to &B1 (fixed serial port rate)
•V.42 bis compression negotiated for the call, and the default size
•Straight data (not already compressed, no
•Transmission from a fast (486) computer
NOTE: .ZIP files that are already compressed or files that appear to the modem to be compressed yield lower throughput. We recommend setting the modem to &K3 when transferring these files, to allow V.42 bis but disable MNP5.
14.4K bps |
| |
| File Type | Typical throughput (cps) |
|
|
|
| Text file | 3400 |
| .ZIP files | 1600 |
| Database files | 4600 |
| Graphic files | 2900 |
21.6.4K bps |
| |
| File Type | Typical throughput (cps) |
|
|
|
| Text file | 5100 |
| .ZIP files | 2400 |
| Database files | 7200 |
| Graphic files | 4300 |
Link Negotiation and Error Control
