The Online World by Odd De Presno
Chapter 12: Practical tips
263 words | Chapter 57
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- Quick transfers with a minimum of errors
- Rescuing lost files
- Copyright and other legal matters
- Unwritten laws about personal conduct
- Privacy
- Fax services weigh less than your printer
- File transfers through the Internet
Speed and safety
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Read about MNP, CCITT V.42, and V.42bis in appendix 2. These are
popular methods for automatic error correction and compression of
data. Compression gives faster transfers of data.
To use them, your modem must have these features built-in. They
must also be enabled in the modem of the service that you are
calling.
Compression is particularly helpful when sending or receiving
text, for example news stories and messages in conferences. They
ensure faster transfers.
They are not of much help when transferring precompressed texts
and programs. They may even make file transfers with protocols like
ZMODEM, Kermit, and XMODEM impossible. If this happens, temporarily
turn off the MNP and V.24/V42bis settings in your modem (more about
this in appendix 2).
Some online services let users retrieve conference messages
using a special get or grab function. This function often comes in
two versions:
* Grab to display: New messages and conference items are
received in an uninterrupted stream without stops between items.
Retrieval of text can happen at maximum speed.
* Grab to compressed file: New messages and conference items
are selected, automatically compressed and stored in a file. This
file is then transferred using ZMODEM or similar protocols.
Some services offer unattended online work with a variation of
the "get compressed file" method. Read about 'offline readers' in
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