Multitech MMH900, User Manual

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Appendix J - Internal MMH2834 Composite Link Modem Commands
J.1.9
Compression and Maximum Block Size Commands
Data Compression The data compression (&E14) command enables data
compression.
Maximum The maximum size of Reliable mode data blocks can be controlled
Block Size with the &BS command. MNP 3 sends blocks of 1 to 64
characters. MNP 4 and 5 typically send blocks of 1 to 256
&BS characters and LAP-M typically sends 128 characters. For MNP
classes 4 and 5/LAP-M, reducing the block size to 64 characters
may give a smoother flow of data and better throughput on noisy
phone lines. Using smaller block sizes over good phone lines
may cause a slight loss in throughput (speed).
AT&BS0 = Maximum transmit block size of 64 characters
AT&BS1 = Maximum transmit block size of 128 characters
PCB (Printed Circuit Board): A flat board that holds chips and
PSTN (Public Switched Telephone