IKS@PSUVM.BITNET (Indra K. Singhal) (08/26/87)
.
MNP 5 for Multitech 224EH modems is around the corner.
Microcom 9624/c has had it for some time now... Why
should you get this $25 or $50 upgrade, as your case may
be ? Couple of reasons:
.
With MNP 3 we essentially got CRC checking at the
firmware level... big deal (it was for long distance file
transfers over packet switched networks). MNP 4 brought
dynamic packet size adjustment and a larger default
packet size... this provided smoother text scrolling and
better efficiency over noisy lines. (I have a very
clean line... I said... Hmmm...) larger packet sizes are
nice. It also achieved upto 122% efficiency by
optimizing data in its packets (remove start/stop bits at
origin & replace at destination when speed conversion
is used). MNP 5, hmmm $25. Hmmm. Should I ?
.
I guess so. MNP 5 does dynamic realtime data compression.
If you use your 224EH's speed conversion capabilities, it
is said to provide up to 4800 baud throughput over 2400
baud lines. Speed conversion means, your 'puter talks to
the modem at 9600 baud while the modem continues at 2400.
If you do not use speed conversion, MNP 5 will bring
little or no benefit.
.
To get speed conversion you need to go into your modem
and flick a dip switch. You have to enable flow control.
Switch 1 on the 4-position switch should be DOWN for CTS
to act normally and NOT be forced on (UP is factory
default). Then make sure the RTS jumper is set to
function normally (which is the default, as per Rev. E
User's manual of 1/15/87, page 9-9) and NOT forced on.
Finally, the CTS/RTS jumper should be such that CTS
follows RTS (again the default, page 9-10).
.
Now for soft changes. Try the following configuration:
&E1 - to set Auto-Reliable mode (see note below)
&E4 - enable hardware flow control CTS/RTS
&E13 - Pacing on
$BA0 - disable baud adjust
$SB9600 - serial port baud rate to 9600.
Once you have it working, issue AT&W0 to save the config.
Thereafter an AT Z will take you to this configuration.
AND before you invoke your favourite Comm program, you
should issue: MODE COM1: 9600,N,8,1 (or what ever).
.
How do you know your speed conversion is working ? Get on
to your favourite BBS, scan some text in non-stop mode
and hit 'Pause' (or PC equivalent CTL-NUMLOCK (??)). You
will see the text stop while the RD light stays on. Then
hit any key to release the pause and try reading at 9600
baud !!!
.
NOTE: some cheap modems get very upset at MNP detection data
being thurst down their RJ11s. When calling them issue
AT&E0 before dialing.
*%*%* Have fun !!
2) I have no connectoin with Multitech other than being a happy
user. The above is from my head AND I am not liable if you get into
trouble for using it... darn skin... have to save it.
-------
Keep Smiling (-:-) --Indra K. Singhal
>> <<
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asp@puck.UUCP (Andy Puchrik) (08/27/87)
In article <18989IKS@PSUVM>, IKS@PSUVM.BITNET (Indra K. Singhal) writes: > . > MNP 5 for Multitech 224EH modems is around the corner. I've been following Indra's Multitech adventures. I went for cheap with the "desktalk II" and then the Turbo 2400 EC, both made by Incomm. The Turbo is MNP 4, Hayes compatible, and 2400 baud. I just called them about the MNP 5 upgrade (4800 baud). It should be shipping in 2 wks. The cost is around $200 from the distributor (USA FLEX). More than Multitech, but the Turbo came in for $319. It will be upgradeable to 9600. Looks like comm speeds are going up faster than my phone bills! -- Internet: asp@puck.UUCP Andy Puchrik uucp: {alliant,wjh12}!maynard!puck!asp Moonlight Systems ARPA: puchrik@tops20 Maynard, MA 01754