HECnet

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15560 discussions

by mcguire＠neurotica.com

This is way off-topic so I will be brief. Does anyone here know if it's possible to connect an IBM bisync device (like the host interface on a 3174-61R) to a serial interface on a Cisco router, and talk it into bridging to Ethernet in whatever protocol(s) the Ethernet-attached 3174s speak? Thanks, -Dave -- Dave McGuire, AK4HZ New Kensington, PA

12 years, 5 months

Sample DCL code for simple client-server task-to-task comms

by sampsa＠mac.com

Half a year or maybe a year ago. Sampsa was running a program which used PHONE to check who was logged in on various machines. When he tried all machines in area 1, MIM got loads of entries in the log for Sampsa's machine trying to talk with machines that were down. (I might be remembering things wrong, and I might be mixing things up, but it was not as if MIM crashed or anything because of Sampsa's code, but I asked him to stop, as he was filling up plenty of logs as far as I can remember.) Yeah, I didn't mean crashed MIM or anything, but caused problems - basically the phone directory just went through the nodelist and did a PHONE DIR to them..If a node was down, the call would fail. It wasn't a good idea from BQT's side :)

12 years, 5 months

Sync serial bridging over Ethernet, was Re: [HECnet] Multi-floor household (DECnet) routing help needed

by ian＠platinum.net

On 2013-01-17, at 10:20 PM, Dave McGuire <mcguire at neurotica.com> wrote: I'd do it with an HDLC/SDLC-capable chip like a Z8530...offload as much from the firmware as possible, leave those cycles for protocol handling. Unless you meant wrapping bare ?DLC frames in packets? I was thinking that we don't even need to decapsulate the serial frame at all - just detect the start and end. All we're doing is emulating a piece of wire, after all. Unless we're putting in a fancy LCD status display, but I think that's overkill. Wrapping the data in UDP is simple. The HDLC layer could deal with error detection/correction. Yes! The problem is finding surplus time to embark on this. Maybe a few of us could collaborate on it? I have that problem as well, but I got really excited when you mentioned it, because I am doing a lot of designs with Ethernet now. I have a "base" design, a "hardware macro" if you will, that I've recycled several times. It's a Philips..erm, NXP LPC2300-series ARM7 with an on-chip Ethernet MAC, and all supporting hardware. I typically run FreeRTOS and uIP on them. The only things I have dev platforms are on my end are PIC and Atmel. I have some Zilog stuff, but I gave up on them several years ago. However, if you're able to put together the hardware layer, and there's a C compiler available for your platform, I can help on the software side. I've also done some software work for a local company that uses a TI Davinci processor. Interfacing an ?DLC engine to that would be a cakewalk starting from that base design as a head-start. I have a few tubes of Z8530s in PLCC-44 packages here. Oh oh. I think there's another project starting... :) -Dave -- Dave McGuire, AK4HZ New Kensington, PA --- Filter service subscribers can train this email as spam or not-spam here: http://my.email-as.net/spamham/cgi-bin/learn.pl?messageid=410C8376613711E2A…

12 years, 5 months

Sync serial bridging over Ethernet, was Re: [HECnet] Multi-floor household (DECnet) routing help needed

by mcguire＠neurotica.com

On 01/18/2013 01:14 AM, Ian McLaughlin wrote: I'm not working on anything now - I just came up with the idea. I meant "do you design stuff with microcontrollers". I did some Googling, and there seems to be commercial units, all around $1K per end (async is much cheaper). Good heavens! Microcontrollers and digital electronics is another one of my hobbies. Excellent! Same here, though I also do it professionally. Async serial is simple for a microcontroller to handle. I've never actually looked to see if there's any synchronous libraries out there. I'd do it with an HDLC/SDLC-capable chip like a Z8530...offload as much from the firmware as possible, leave those cycles for protocol handling. Unless you meant wrapping bare ?DLC frames in packets? Wrapping the data in UDP is simple. The HDLC layer could deal with error detection/correction. Yes! The problem is finding surplus time to embark on this. Maybe a few of us could collaborate on it? I have that problem as well, but I got really excited when you mentioned it, because I am doing a lot of designs with Ethernet now. I have a "base" design, a "hardware macro" if you will, that I've recycled several times. It's a Philips..erm, NXP LPC2300-series ARM7 with an on-chip Ethernet MAC, and all supporting hardware. I typically run FreeRTOS and uIP on them. Interfacing an ?DLC engine to that would be a cakewalk starting from that base design as a head-start. I have a few tubes of Z8530s in PLCC-44 packages here. -Dave -- Dave McGuire, AK4HZ New Kensington, PA

12 years, 5 months

Sync serial bridging over Ethernet, was Re: [HECnet] Multi-floor household (DECnet) routing help needed

by ian＠platinum.net

I'm not working on anything now - I just came up with the idea. I did some Googling, and there seems to be commercial units, all around $1K per end (async is much cheaper). Microcontrollers and digital electronics is another one of my hobbies. Async serial is simple for a microcontroller to handle. I've never actually looked to see if there's any synchronous libraries out there. Wrapping the data in UDP is simple. The HDLC layer could deal with error detection/correction. The problem is finding surplus time to embark on this. Maybe a few of us could collaborate on it? Ian On 2013-01-17, at 10:07 PM, Gregg Levine <gregg.drwho8 at gmail.com> wrote: On Fri, Jan 18, 2013 at 12:53 AM, Dave McGuire <mcguire at neurotica.com> wrote: On 01/18/2013 12:41 AM, Ian McLaughlin wrote: I wonder if there'd be any interest in cobbling up a little microcontroller circuit that could convert synchronous serial to Ethernet. We could use these to emulate leased lines on equipment that doesn't even have Ethernet boards. YES. Are you working with that sort of stuff? I ask because I am and could probably do it. -Dave -- Dave McGuire, AK4HZ New Kensington, PA Hello! That is a truly amazing idea. What sort of adapters are the both of you thinking of? ----- Gregg C Levine gregg.drwho8 at gmail.com "This signature fought the Time Wars, time and again." --- Filter service subscribers can train this email as spam or not-spam here: http://my.email-as.net/spamham/cgi-bin/learn.pl?messageid=58228A76613511E2A…

12 years, 5 months

Sync serial bridging over Ethernet, was Re: [HECnet] Multi-floor household (DECnet) routing help needed

by gregg.drwho8＠gmail.com

On Fri, Jan 18, 2013 at 12:53 AM, Dave McGuire <mcguire at neurotica.com> wrote: On 01/18/2013 12:41 AM, Ian McLaughlin wrote: I wonder if there'd be any interest in cobbling up a little microcontroller circuit that could convert synchronous serial to Ethernet. We could use these to emulate leased lines on equipment that doesn't even have Ethernet boards. YES. Are you working with that sort of stuff? I ask because I am and could probably do it. -Dave -- Dave McGuire, AK4HZ New Kensington, PA Hello! That is a truly amazing idea. What sort of adapters are the both of you thinking of? ----- Gregg C Levine gregg.drwho8 at gmail.com "This signature fought the Time Wars, time and again."

12 years, 5 months

Multi-floor household (DECnet) routing help needed

by b4＠gewt.net

On 18 Jan 2013, at 00:55, Dave McGuire <mcguire at neurotica.com> wrote: On 01/18/2013 12:33 AM, Cory Smelosky wrote: I wonder how many telcos will still give you a plain leased line over POTS... Most all of them, if not ALL of them. Leased lines, however, aren't POTS. POTS refers to single analog phone lines, which leased lines (56K DDS, T1, T3, etc) are not. Thanks for the clarification, I often confuse some telecom stuff. ;) Just a nit. ;) -Dave -- Dave McGuire, AK4HZ New Kensington, PA

12 years, 5 months

Multi-floor household (DECnet) routing help needed

by mcguire＠neurotica.com

On 01/18/2013 12:33 AM, Cory Smelosky wrote: I wonder how many telcos will still give you a plain leased line over POTS... Most all of them, if not ALL of them. Leased lines, however, aren't POTS. POTS refers to single analog phone lines, which leased lines (56K DDS, T1, T3, etc) are not. Just a nit. -Dave -- Dave McGuire, AK4HZ New Kensington, PA

12 years, 5 months

Sync serial bridging over Ethernet, was Re: [HECnet] Multi-floor household (DECnet) routing help needed

by mcguire＠neurotica.com

On 01/18/2013 12:41 AM, Ian McLaughlin wrote: I wonder if there'd be any interest in cobbling up a little microcontroller circuit that could convert synchronous serial to Ethernet. We could use these to emulate leased lines on equipment that doesn't even have Ethernet boards. YES. Are you working with that sort of stuff? I ask because I am and could probably do it. -Dave -- Dave McGuire, AK4HZ New Kensington, PA

12 years, 5 months

Multi-floor household (DECnet) routing help needed

by mcguire＠neurotica.com

On 01/18/2013 12:41 AM, Ian McLaughlin wrote: With some of the speeds I'm getting through several people's home DSL internet in and back out again to get from here to Europe, I'd say the actual speeds I'm getting are pretty close to the 'good old days' :) Your first stop is here I think, for at least one of your links, and I have a fair bit of bandwidth here. -Dave -- Dave McGuire, AK4HZ New Kensington, PA

12 years, 5 months

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