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COURIER HIGH SPEED MODEMS
Link Negotiation and Error Control A-9
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 11-bit, 2048-entry dictionary
• Straight data (not already compressed, no file-transfer
protocol)
• 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