HECnet

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15590 discussions

by Paul_Koning＠Dell.com

I found a manual online: http://www.carnagevisors.net/dec94mds/detmminb.pdf It's a repeater (a.k.a., hub) not a switch (a.k.a., bridge). It's not fancy at all. A repeater takes incoming Ethernet transmissions and repeats them on all the other ports unconditionally. Also, a repeater is by definition a half duplex device, so you have the CSMA/CD (collisions and all that) of classic Ethernet. A bridge receives a packet and transmits it on the appropriate output port (if any), and can be full duplex. The 900TM is 10Base-T, so 10 Mb/s Ethernet -- not fast Ethernet (100Base-T). Suitable for old slow Ethernet devices... paul -----Original Message----- From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of Mark Wickens Sent: Wednesday, October 28, 2009 11:22 AM To: hecnet at Update.UU.SE Subject: [HECnet] DECrepeater 900TM Can someone explain to me what a decrepeater 900tm is? Is is a fancy 32 port 10MB switch? Regards, Mark. --

16 years, 4 months

DECrepeater 900TM

by mark＠wickensonline.co.uk

Can someone explain to me what a decrepeater 900tm is? Is is a fancy 32 port 10MB switch? Regards, Mark. --

16 years, 4 months

RHESUS is (finally) up again

by healyzh＠aracnet.com

At 4:08 AM +0100 10/28/09, Johnny Billquist wrote: Guilty, PONDUS is usually the machine that reacts most quickly to DECserver boot requests... In that case I need to figure out where I stuffed my DS200. :-) Sounds like it is time for me to finally think about figuring out if it works. Zane -- | Zane H. Healy | UNIX Systems Administrator | | healyzh at aracnet.com (primary) | OpenVMS Enthusiast | | MONK::HEALYZH (DECnet) | Classic Computer Collector | +----------------------------------+----------------------------+ | Empire of the Petal Throne and Traveller Role Playing, | | PDP-10 Emulation and Zane's Computer Museum. | | http://www.aracnet.com/~healyzh/ |

16 years, 4 months

Crimper

by Paul_Koning＠Dell.com

A typical crimper has a cavity that holds the connector, using the locking tab to lock it into position. So an MMJ crimp requires an MMJ cavity, and a standard RJ11 one is unlikely to work. (I assume you meant RJ11 -- RJ12 is the telephone handset connector, which is narrower.) Cheap crimpers have the cavity as part of the tool; more expensive ones have interchangeable "dies" and for those an MMJ die may well be available. I'd expect the ones from the likes of AMP, for example, to offer that, though finding the MMJ die nowadays is likely to be fairly hard... paul -----Original Message----- From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of Mark Wickens Sent: Wednesday, October 28, 2009 10:08 AM To: hecnet at Update.UU.SE Subject: [HECnet] Crimper Best bet I would have thought was ebay - that's where I picked mine up from - it's second hand and specifically for MMJ. Not sure whether a generic RJ12 crimper may do the job, would depend on how it handled the tab. I've thought about doing a bulk order of MMJ connectors - if there is some interest out there for taking some off my hands I'd consider it. Regards, Mark. --

16 years, 4 months

RHESUS is (finally) up again

by bqt＠softjar.se

Mark Wickens wrote: On Wed, 2009-10-28 at 10:15 -0400, Fred wrote: On Wed, 28 Oct 2009, Johnny Billquist wrote: I have someone booting some DECserver 200 which was served by PONDUS:: (It's all in the logs...) Only a couple of days ago. For some reason that strikes me as "pretty neat". It all goes over the bridge and onto HECNet "somewhere" to find a host willing to do a load. :) Fred That's exactly what I was thinking... might save me having to dig out my decserver software firmware sometime... PONDUS can serve the firmware for DECserver 100, DECserver 200 and DECserver 300. That's all the firmware I have, and I also suspect that I cannot get RSX to feed MOP images for other models, because RSX wants to be picky about some stuff I think it should properly ignore. Johnny

16 years, 4 months

Crimper

by ploopster＠gmail.com

Johnny Billquist wrote: Mark Wickens wrote: Best bet I would have thought was ebay - that's where I picked mine up from - it's second hand and specifically for MMJ. Not sure whether a generic RJ12 crimper may do the job, would depend on how it handled the tab. I've thought about doing a bulk order of MMJ connectors - if there is some interest out there for taking some off my hands I'd consider it. Regards, Mark. I think there are/were crimpers that did manage both. Specifically designed for that. I still have a small stash of MMJ connectors, but I could buy of bunch, if you ordered. cables.com has them for US$0.19 apiece. I buy them in lots of 100. Peace... Sridhar

16 years, 4 months

RHESUS is (finally) up again

by bqt＠softjar.se

Fred wrote: On Wed, 28 Oct 2009, Johnny Billquist wrote: I have someone booting some DECserver 200 which was served by PONDUS:: (It's all in the logs...) Only a couple of days ago. For some reason that strikes me as "pretty neat". It all goes over the bridge and onto HECNet "somewhere" to find a host willing to do a load. :) Indeed. However, it might be worth pointing out that doing MOP boots, as well as LAT in general, will only work over my bridge software, and not over DECnet-over-Multinet. LAT and MOP are not properly a part of DECnet. However, my bridge program can bridge those protocols as well (optional, you can enable only DECnet, or LAT/MOP if you want to). Johnny

16 years, 4 months

RJ45 MMJ Cables

by ploopster＠gmail.com

Brian Hechinger wrote: I have made my own cables in the past, although I've now run out of MMJ connectors. I have a whole reel of cable if anyone needs some, or if you have some MMJ connectors and need cables I can make them up for you. I really need to get myself a crimper that does MMJ. Any recommendations? I'd like one that does both MMJ and RJ45 if possible. Ideal Crimpmaster. Takes interchangeable dies. MMJ is available. Don't get an imitation one. Peace... Sridhar

16 years, 4 months

Crimper

by bqt＠softjar.se

Mark Wickens wrote: Best bet I would have thought was ebay - that's where I picked mine up from - it's second hand and specifically for MMJ. Not sure whether a generic RJ12 crimper may do the job, would depend on how it handled the tab. I've thought about doing a bulk order of MMJ connectors - if there is some interest out there for taking some off my hands I'd consider it. Regards, Mark. I think there are/were crimpers that did manage both. Specifically designed for that. I still have a small stash of MMJ connectors, but I could buy of bunch, if you ordered. Johnny

16 years, 4 months

Terminal (servers), cables (was Re: [HECnet] RHESUS is (finally) up again)

by fcoffey＠thrifty.misernet.net

On Wed, 28 Oct 2009, Steve Davidson wrote: The RJ45 to MMJ adapter is known as a H8584-AA (in my case REV A). I use them on my DEChub-90TL's. They work GREAT! They can be hard to find these days and also costly, but well worth it. Start on Ebay. I have access to a source that are starting to use PeeCees with VT emulation instead of real VT525's (not all, but most) so as they transition those little connectors become available for me to take, as they aren't using them anymore and have plenty of spares. Last time I was there I just got handed a "handful". If I get a huge "haul" I'll let the list know. I obviously won't need more than the number of terminal server ports I have ... Fred

16 years, 4 months

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