HP-3000 Systems Discussion wrote:
> Speaking of throttling on HP3000's, can anyone tell me why
> traditional Reflection file transfer is so gawdawful slow?
> 
> I knew there was a reason for it, I just can't remember.

Sure.

A "regular" reflection transfer is operating over the terminal interface.
Reflection is capturing data sent over a terminal connection; which means 1)
the data has to be cleaned/encoded so no unfortunate/unexpected connection
interruptions occur (control-y/q/f/esc/etc.) and 2) data transfers are
limited to terminal device recsizes (80/132/256 bytes per line, with
appropriate required flow controls). That's a lot of extra overhead; one
read operation per record.

The "fast" file transfers open a separate tcp/ip port and simply blast the
data across the network un-encoded and without any extra flow controls
-beside those built into TCP/IP). Very similar to FTP file transfers.

-Chris Bartram

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