This reminds of me of the failure-mode-within-a-failure-mode of 10b2 with vaxstation2000's using vms's vaxcluster software. Unplugging the 10b2 gave you a window of about 10 seconds before one by one every vaxstation2000 would bugcheck. I was always rather astonished that nobody at DEC either noticed it, or thought it was a very big deal because the bug survived a long time.
I thought that was just me. My first IT job was developing credit-card systems on VAXen. We had the office flood-wired with 10base2 in one long bus - at locations where there wasn't a PC yet, there was just a faceplace with two BNC connectors, and a tiny patch lead between them. To install a new PC, you had to have a length of co-ax long enough to go from the faceplate to the desk and back, with a T-piece in the middle. Installation involved whipping out the short patch lead and re-connecting both ends of the longer one before things elsewhere declared the network as broken and started shutting down somewhat ungracefully. This was best done as a two-man job, but we did get it down to quite an art. Nice to know after all this time that someone else was playing the same silly game... Regards, Tim.
I thought that was just me. My first IT job was developing credit- card systems on VAXen. We had the office flood-wired with 10base2 in one long bus - at locations where there wasn't a PC yet, there was just a faceplace with two BNC connectors, and a tiny patch lead between them.
To install a new PC, you had to have a length of co-ax long enough to go from the faceplate to the desk and back, with a T-piece in the middle. Installation involved whipping out the short patch lead and re-connecting both ends of the longer one before things elsewhere declared the network as broken and started shutting down somewhat ungracefully. This was best done as a two-man job, but we did get it down to quite an art.
Nice to know after all this time that someone else was playing the same silly game...
There were several proprietary solutions to the 10base2 conundrum, I can't remember the name of the one I was most familiar with, but it eliminated all that stuff by using a molded cable that had a BNC on one end, contained dual RG cables inside a heavy jacket, and a funky molded plug on the end. The plug would connect to a socket through which a 10base2 segment ran, and inserting the plug would open a switch that shorted the conductors, and then the cable would form the link to re-complete the segment. Much fun was to be had: 1) Plugging in a network cable partway might break the circuit without also establishing the new path, 2) Sometimes the sockets would get fouled and locating the problem was a royal pain, 3) Because the system was meant to be simple enough for users to use, users would sometimes plug in too many of these cables, extending the maximum length of the network beyond standard, 4) Also because users could be involved, when one of them did something to the network, they would either not realize it or not own up to it, further adding to the debugging fun. When it worked, it worked great. Which was most of the time. I used to remember what the darn things were called... ... JG -- Joe Greco - sol.net Network Services - Milwaukee, WI - http://www.sol.net "We call it the 'one bite at the apple' rule. Give me one chance [and] then I won't contact you again." - Direct Marketing Ass'n position on e-mail spam(CNN) With 24 million small businesses in the US alone, that's way too many apples.
Am 07.04.2010 um 17:47 schrieb Joe Greco:
There were several proprietary solutions to the 10base2 conundrum, I can't remember the name of the one I was most familiar with, but it eliminated all that stuff by using a molded cable that had a BNC on one end, contained dual RG cables inside a heavy jacket, and a funky molded plug on the end.
One system popular in Germany at the time used a modified German phone plug ("TAE"), and the resulting system was marketed as "EAD" or Ethernet Anschluss Dose. The coax was way too heavy and stiff for the small plug, and would regularly unseat the connector. Since the phone plug was never designed to have a defined impedance, any run longer than about 50 meters for the segment was hit and miss. http://en.wikipedia.org/wiki/EAD-socket Stefan -- Stefan Bethke <stb@lassitu.de> Fon +49 151 14070811
participants (3)
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Joe Greco
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Stefan Bethke
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Tim Franklin