Novaterm 9.6 User's Guide
Note: This is not the same protocol as Punter's C2 batch protocol.
3.4.3.9 Kermit
The Kermit protocol is designed to work over communication links
where other protocols aren't able to function for whatever reason. If
control characters are intercepted or changed by a network switcher or
other device before the receiving software sees them, file transfers
with protocols like Xmodem and Ymodem will not work. Kermit
seeks to overcome this problem by encoding all data characters as
text. Because of this, and because it allows up to only 94 bytes per
block, Kermit is very slow. It should only be used in situations where
it is the only protocol that will work.
Kermit does support batch file transfers.
3.4.3.10 Wxmodem
This is a version of Xmodem designed for use over networks where
the delay between sender and receiver is significant. It is designed to
send up to 512 bytes of data at a time. It is provided in Novaterm for
those situations where it is the only protocol available to the other
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3.4.4 Selecting a block size
Some protocols allow you to vary the size of data blocks that are
transmitted. Basically, a data block is a segment of the file being
transferred. The data block is sent by the sending computer along
with a checksum of the block. When the sender has transmitted a
block, it then waits for the receiver to acknowledge it as either good or
bad before continuing.
The size of that data block affects performance. With larger sizes,
fewer acknowledgments must me sent by the receiver, so the file
transfer is faster. However, if the communication link is noisy at all,
many blocks may need to be re-transmitted; therefore, a smaller block
size will alleviate the overhead of having to retransmit large data
blocks that were corrupted.
Only some of the protocols allow you to change the block size:
Zmodem allows block sizes between 32 and 1024 bytes.
Punter allows block sizes between 40 and 255 bytes.
Kermit allows block sizes between 20 and 94 bytes.
To change the block size, use the Block size option on the