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1990-08-17
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<<< Information on Protocols >>>
<B> BiModem: is a new communications protocol
which allows simultaneous bidirectional file transfers.
Yes, BiModem can upload while downloading. If that
feature is not enough to get you really excited, how
about the ability to chat while the transfer is going
on? Chatting, of course, will impact your throughput.
BiModem has more than just * name handling. You can create
a large list of upload and download requests before
you even sign on. Create an entire evening's worth of
requests and let your computer do the rest.
<C> Lynx: Based on the assumption that a connection between two
sites is capable of full-duplex transmission.
The reason that Lynx makes use of full-duplex operations is
to insure optimum transfer speed.
Lynx can transfer up to 255 files in a single batch.
Press ENTER for More
<G> Ymodem-G: This protocol is a variation on Batch Ymodem. It
achieves very high transfer rates by sending blocks one after
another without waiting for acknowledgement. This however means
than an error-free link such as an error-correcting modem or
null modem cable between two computers is needed. If an error is
detected by the receiver, the transfer is aborted. It allows
transferring multiple files.
<H> Hyper: This is a stand alone HYPER drive protocol driver to be
used to do Hyper-Drive file transfers with Lynx systems.
<J> Jmodem: Jmodem was designed to maximize the amount of data that
can be transferred in a given time. It sends very long blocks
of data using 16 bit CRC error correction and compressing the
data wherever possible.
<K> Kermit: The Kermit protocol was designed to permit computers
of different types to send files to each other. Almost any
computer using Kermit can be set up to send files to another
computer using Kermit. But it's very, very, very slow.
Press ENTER for More
<L> TRANSlink: Yet another protocol that claims itself to be better
than X-modem.
<M> MEGAlink: A protocol that claims itself to have picked up the best
parts from X-modem, Sealink and WXmodem.
<S> SEAlink: SEAlink is an advanced version of Xmodem developed by
System Enhancement Associates. It is a sliding window protocol
<O> SEAlink is 15 to 25 percent faster than regular Xmodem. SEAlink
passes a file's name, size, and date when transferring it, and
can be used to send more than one file at a time.
<T> Batch Ymodem: This protocol is a variation on Ymodem, which
allows for multiple files to be sent per transfer. While
transferring files, it keeps the correct name, size, and date,
and may use 128 or 1024 byte block sizes.
<W> Windowed Xmodem: This is the same as Xmodem except that it
has a longer delay time. This is for use with remote services
that can not tolerate strict timing during Xmodem transfers.
Press ENTER for More
<X> Xmodem: This is the most popular protocol in use today, but it
is slowly being replaced by quicker and more reliable protocols.
Error checking is a checksum or a the sophisticated Cyclic
Redundancy Check. The Xmodem protocol requires a setup of no
parity, 8 data bits, and 1 stop bit.
<Y> YModem: XMODEM-1k with 1024 byte blocks, sometimes mislabeled as
ymodem
<Z> Zmodem: This advanced protocol is very fast and extremely
reliable, and offers many features. Zmodem can transfer a group
of files in one batch, while keeping the exact file size and
dates. Zmodem can detect and recover from errors quickly, and
<R> can resume an interrupted transfer at a later time (this
feature, called Zmodem Recovery.) Zmodem is also very well
suited for satellite links and packet switched networks.