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тАО05-04-2008 08:36 PM
тАО05-04-2008 08:36 PM
Re: connect two decservers
What you need to make clear, though, is what your new configuration will be. How will the Ohio and Ga locations be connected? What else will move and what will stay? Is the application going to a different system with the old system remaining? Is the old system moving?
If it's a "canned" application, you probably aren't the only one using it, so what application is it? Maybe someone here is using it, too. How LAT-specific is it? Is it still supported or do you have the source code and someone who can work on it? Is there enough budget that you could replace the 200 with an IP capable server? If you're working with $.00 budget, then someone has some unrealistic expectations.
You obviously need *some* connection between the locations and knowing what that is and what else you have to work with will determine what you need to do.
Since you're going around 700 miles I doubt that you could achieve a fast enough link to bridge LAT, or at least it doesn't sound like you have that kind of budget.
Connecting two remote DECservers is not the way to achieve what you want. You need to tell us more.
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тАО05-05-2008 04:48 AM
тАО05-05-2008 04:48 AM
Re: connect two decservers
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тАО05-05-2008 04:58 AM
тАО05-05-2008 04:58 AM
Re: connect two decservers
First, the problem is that there little known about the use of the LAT protocol by this application. Without more information (some of which can be obtained by monitoring the serial outbound line), it is difficult to say with precision what will or will not work.
The "trick" that is possible in some cases is to leave the LAT termination local (e.g., the DECserver 200), wire the outgoing port to a different server that supports TCP/IP, and use an automatic telnet connection to a reverse telnet port on the remote server over the IP network. It is a little "Rube Goldberg", but if done carefully, it works.
If you are not comfortable with this, consider bringing someone in who is familiar with the intricacies of such a configuration. It is important to check this out carefully, as it can be a challenge to troubleshoot in the event of a network problem.
- Bob Gezelter, http://www.rlgsc.com
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тАО05-05-2008 05:18 AM
тАО05-05-2008 05:18 AM
Re: connect two decservers
What I would like to do is smtp mail but I don't know if there is enough info on my side to know which companies the pagers use, could be several, and whether they have an email/smtp location for sending pages. The vendor certainly isn't going to give me their table/xref then we wouldn't need their service.
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тАО05-05-2008 06:27 AM
тАО05-05-2008 06:27 AM
SolutionI see no (obvious) free lunch here.
Application code that calls into LAT can be anywhere from trivially simple to rewrite-it scale really-hairy. And the application itself is almost certainly old source code, given it's using DECserver 200 boxes.
Reworking and adding dial-up might be cheap, or it might be cheaper to use the leased line and not touch the existing code. You need to decide how much you want to spend, and on what, but you will be spending.
I've posted up some C code that sends out email under an MIT-style copyright, and that code can likely be adapted and used for these sorts of cases -- when the paging network supports email-based pages.
http://64.223.189.234/node/744
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тАО05-05-2008 06:50 AM
тАО05-05-2008 06:50 AM
Re: connect two decservers
So, if I understand this, the application is considered critical enough that your company leases a dedicated line (and backs it up with a modem), but, for a transitional period, is willing to send the pages to that leased line through third-party Internet services. Why not switch to a modem-only system in Ohio, until the leased line is moved?
Programming for a LAT port is similar to programming for a local terminal port, with some code added for dealing with data-set hangups and broken LAT connections. The application can probably talk to a regular terminal port. If so, you could write a program that uses the pseudo-terminal device to replace the LAT port. It then transmits the port data over IP to a sister program in Georgia that sends it on to the LAT port. See the OpenVMS I/O User's Reference Manual chapter on pseudo-terminals.
If the vendor won't tell you the contents of the database (and it wouldn't hurt to ask!), you might be able to dump it. How do you maintain this database? If there's any kind of add/modify/delete capability, there should also be a way to list the entries.
You mentioned that your company isn't bridging DECnet. It is possible to transport DECnet over IP by using either DECnet-Plus or DECnet-IV with Multinet (and possibly other IP stacks). But I don't see how a DECnet connection really helps unless you can divide the application up across your two locations -- the main stuff in Ohio with the actual page transmitter software in Georgia.
Also note that some DECServer 200s, the "MC" models, have full RS232 modem-control signals, but (I believe) the DECServer 300s do not.
Good luck,
Kelly
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тАО05-05-2008 06:55 AM
тАО05-05-2008 06:55 AM
Re: connect two decservers
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тАО05-05-2008 07:31 AM
тАО05-05-2008 07:31 AM
Re: connect two decservers
>>>
possible to modify the Progress program
<<<
Is this as in 'programming around the Progess Database by Progress Software?
In that case some extra warnings are warranted:
"Progress: dropped support for "Progress on VMS" as per 1/1/01 (and devellopment some years before that).
Nowadays the company has NOONE anymore that knows about VMS.
That certainly means there is NO way you will ever be able to move this to I64 (and even Alpha V8 is and will remain unqualified).
(I have been in that same corner)
Proost.
Have one on me.
jpe
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тАО05-05-2008 09:25 AM
тАО05-05-2008 09:25 AM
Re: connect two decservers
You still haven't said if the two sites are connected in some way other than via Internet or POTS. Since you're talking DR, it seems likely you have something else, too.
Forgive me, but you seem to still be thinking about this from the LAT point of view. The DECserver ports are serial. DECservers are Ethernet devices. To connect two DECservers via their ports, you must extend a serial connection between them. To connect two DECservers on your network, you must extend Ethernet between them.
So far, Kelly Stewart has suggested the easiest way: Switch to a modem-only system in Ohio until you set up a leased line there (or until you come up with a better solution).
Since you're going for a DR setup, this would be a good time to look at how you can talk to your paging service provider some way other than with a non-redundant and not-easily switched leased line.
I really don't understand what you mean by "which companies the pagers use." Some pagers have telephone numbers. The phone company allocates numbers to the paging service provider who in turn assigns those numbers to the pagers. Others use a central PBX number and treat each pager like an extension. From a telephone, can you call a pager directly or do you call a central number and then enter a pager number?
Software like Dispatch-1 just provides an automated way to do the dialing and such.
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тАО05-05-2008 11:22 AM
тАО05-05-2008 11:22 AM
Re: connect two decservers
If you are creating the device, it may be possible to move the leased line to a TCPIP enabled terminal server and create a TNAxxx device (telnet) to pass to the application.
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