> I have an Ascend Pipeline-75 here at my house (would have loved to use
> a OR-U, if it had POTS ports, but it dosen't), and it has supported STAC
> for quite sometime. I have also used it to connect with another P50 and
> had no problems in that respect. So as we convereted to PM3's in house I
> ended up losing my data compression, till this new card for the PM3.
The NEWGEN OR-U's have pots. ANd I HOPE they are wall mountable.
> So I installed the card, booted the PM3, and during the startup it
> informed me the compression card was recoginized, so I smiled. Then I
> told my P75 to connect to it using STAC (The P75 supports STAC, MS-STAC,
> and STAC-9), and saw no improvement in througput moving a very compressible
> file. As Livingston says they support MS-STAC, I then tried that with the
> same results, 0 increase. So I thought what hte heck, I have no idea what
> this STAC-9 is but it's worth a shot. I setup for STAC-9 and then made
> the transfer and get about 525kbps, man did this make me happy!!
Assend had some proprietary stack, then the LZH compliant stac. I had to
upgrade customer pm 25's EVEN THO they had the stac card to do REAL stac.
> So I wrote to Ascend and asked what the heck was STAC-9, and was told
> it was the open standard form of STAC, where regular STAC mode is specific
> to Ascend (I can live with that). As usual everything seems to have a
> down side in this world. I ran with STAC-9 selected for several days, and
> would find that every now and then when performing a lot of data movement
> over the link that things would freeze. Then only way to correct this was
> to drop my connection and re-dial. I had this happen a great many times,
> and usually when moving a lot of data over the link (I have a 24/7 connection),
> as during my idle time I never saw it die. So I disabled the compression
> on my end (thought he compression card is still in the PM3), and figured
> I would run a few days like that. No more lockups, everything was back
> to perfect, just less throughput.
Hrm, what is the os rev on your p75?
> So my questions are as follows regarding the compression.
>
> 1) If M$-STAC is supposed to be supported, why dosen't it work?
It works fine between an upgraded p25 and an upgraded or-u.
>
> 2) Why am I seeing connection hangs when using compression that requires
> a complete link reset?
Hrm, interesante.
>
> 3) Is the ComOS 3.5.1b20 incomplete in regards to supporting this card
> and the various STAC modes, or should I expect to continue to see the
> above troubles even with the new ComOS 3.7 when it's released?
> I suspect compatibility between Livingston and Ascend should be of some
> importance as there is a lot of Ascend gear in the field as well. I figured
> I would post this to the list as well as send it off to support, as I would
> be most interested in hearing the experiences of other users who decided to
> jump and get the new compression card...
It is important that that work, yes. I dunno if the stac card and the OR-U
stac compression are the same code altho I would suspect that it is the
same. Make sure that BOTH products are running revision 9 of the LZH stac
specification.
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Jake Messinger 713-772-6690 jake@ams.com
Advanced Medical Systems, Inc. jake@uh.edu
8300 Bissonnet #400
Houston, Texas 77074 http://www.ams.com/~jake
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