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тАО05-02-2008 05:42 AM
тАО05-02-2008 05:42 AM
Solved! Go to Solution.
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тАО05-02-2008 06:27 AM
тАО05-02-2008 06:27 AM
Re: connect two decservers
Routing LAT is a problematical exercise. LAT presumes very low latency. Routing (or bridging) Ethernet frequently violates these presumptions, resulting in dropped connections and other problems.
Depending on other details, one MIGHT be able to put something together using connections looped back to reverse TELNET connections to use the TCP/IP telnet protocol for the routed network and LAT for the end. Why is LAT being used? Would TELNET (TCP/IP) work with this application? There seem to be some details missing.
- Bob Gezelter, http://www.rlgsc.com
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тАО05-02-2008 06:38 AM
тАО05-02-2008 06:38 AM
Re: connect two decservers
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тАО05-02-2008 08:50 AM
тАО05-02-2008 08:50 AM
Re: connect two decservers
The LAT protocol was never opened up and was (for many years, if not still) covered by patents and licenses, so no routers or other similar gizmos were never pursued, and are not available. (IP won.)
I assume that refactoring the application has been considered and discarded. If not, the usual path is replacement either with IP and telnet, or replacement with something that "sends pages" (not sure what that means) with another available protocol.
If refactoring is an option, there are various discussions around migrating from LAT to IP telnet available (and around reverse LAT and its reverse telnet analog, if that is in use here), though I would also seriously consider and would investigate approaches beyond the expediency of mapping LAT into its current equivalent of telnet, VPN, ssh or otherwise.
Stephen Hoffman
HoffmanLabs LLC
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тАО05-02-2008 12:02 PM
тАО05-02-2008 12:02 PM
Re: connect two decservers
More details are critical. Is the application writing directly to the LAT port, or is it using it as a printer? Is the code available? Does the program ACTUALLY use LAT-specific coding, or is LAT merely the way that things are (were) setup?
In a brute force case, it is also possible to move the DECserver 200 (or another server) and use LAT for a local leg with the rest of the journey being used in a different port via telnet.
- Bob Gezelter, http://www.rlgsc.com
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тАО05-02-2008 01:23 PM
тАО05-02-2008 01:23 PM
Re: connect two decservers
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тАО05-02-2008 02:20 PM
тАО05-02-2008 02:20 PM
Re: connect two decservers
What I understand so far is:
1. An application connects to a DECserver via LAT over your intranet.
2. You have some leased-line tele-com equipment connected to one DECserver (serial?) port and a dial-up modem connected to another. The application will try one, and on failure will try the other.
3. You're not responsible for whatever happens outbound past the DECserver ports / comm-equipment.
4. Somethings going to change.
SO, What's staying where it is now, and what's going to move elsewhere: the comm line(s)? the application? the DECserver?
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тАО05-02-2008 03:07 PM
тАО05-02-2008 03:07 PM
Re: connect two decservers
You're probably going to have to rewrite (some of) this LAT software stuff. A partial rewrite is probably more palatable than a complete replacement, but there are commercial software tools and packages around that send out pages, and probably some open source for this purpose. And even the rewrite itself likely isn't hairy.
This because the existing software almost certainly doesn't deal with dial tone and dialing out -- and if you don't have the leased line, you're going to have to add code to do that. (There are a couple of ways to implement this, too, whether using language I/O or $qio[w] or LAT-specific calls.)
That, or figure out how to have the modem do this automatic ringdown, or to create an outboard "leased line emulator" box to deal with this, and that approach probably just as much work to deal with -- and more likely to tip over.
Or you get the leased line, such as what's sometimes known as a ringdown line; a dedicated line.
Sorry.
On the plus side, reading off a database and sending email to the paging network or connecting more directly into a paging network or such is straightforward programming. If you're sending numeric pages, those can usually be sent from a touch-tone dial sequence, and that's easy and it requires minimal hardware.
I won't suggest Asterisk or VoIP, but that'll do this sort of stuff, too.
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тАО05-02-2008 04:57 PM
тАО05-02-2008 04:57 PM
Re: connect two decservers
http://linux-decnet.sourceforge.net/lat.html
Phil
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тАО05-04-2008 05:48 PM
тАО05-04-2008 05:48 PM