At 01:21 AM 11/25/1999 -0700, you wrote:
>I have the sneaking suspicion you've found a cache of old ARCnet stuff. It's
>been a long time since I've used it, but that's the only combination I can
>think of that would use a hub with *mutliple* BNC connectors running coax
>out to workstations.
Yes! I should have (silly me) mentioned the model and stuff: ARCnet huh,
PDC508. Haven't had time yet to stick it in a search engine.
>A few hints:
>
>- Tiara and SMC were very big ARCnet manufacturers. If they're the
>manufacturer, there's a good chance it may be ARCnet.
>- ARCnet uses a thicker guage cable than Ethernet. Compare the cable to RG58
>(thin-Ethernet). I believe it's 75 or 90 ohm stuff, so check the cable
>jacket for any info.
RG 62A/U type is written there. BTW the cards didn't come from the same
source, they just have the BNC connector so I'm being optimistic.
>- Some ARCnet configurations let you use multiple devices on coax off of an
>active hub. In this case, there will be a terminator at the end of the chain
>off the end tee connector. Check the impedance on that if possible. Again,
>50 ohms indicates Ethernet, otherwise it may be ARCnet.
terminator is 50 Ohms I appear to have only one, so will go back to source
and see if another is kicking around in the dusty corner.
also have (from same source as cards) some weird little jobbies that look
to convert RJ45 to BNC and have a small side cover plate that exposes two
places to insert wire with a screw on each to tighten down the connection.
They're only marked "Northern Telecom BU1002TX R4T5
>- Each ARCnet board is identified by an 8 bit identifier, usually set with
>dip switches somewhere on the card. If you're lucky, the switch is
>accessible from the rear without removing the cover. Otherwise, MAKE SURE
>each is unique. I once spent a miserable weekend at a school opening dozens
>of boxes to find the conflicts after one install team used the wrong
>polarity to determine node id's.
I have 3 ISA cards, (another one from another source still sitting out in
the car), they have two jumpers. M1 and M2 in an area labled as E@ and a
diagram that offers the following choices:200h, 280h, EISA EEPROM No
switches on rear, just one BNC connector and one diode. The one out in the
car has two diodes and also a db connector, pins not yet counted. (it's
snowy and icky out, I'll haul it in next time I am out)
>There were some other early products that I may not be aware of, but if it
>IS ARCnet, it can be put into use. It was great stuff, extremely forgiving
>in terms of cabling rules. I recall the speed being 2.5Mbps using token bus.
>Drivers for DOS should be available aplenty, and most ARCnet boards can use
>common drivers.
Nifty! If I can get my paws on another terminator I may be in
business. Also, can I get away with sticking an RJ45 card on and using the
funny little adapters? That would increase the NICs available to play with.
>Look for manufacturer and model numbers, FCC ids etc. and post 'em if you
>got 'em! Some of the old Novell manuals were a great source of info on
>jumper settings and such.
yes, when I was free I was going to stick the fcc, model numbers, etc into
Metacrawler and see what crunches out
hub allows up to 6 nodes and has it's power supply!
The cards I have here are by digital, fcc: AO9-DE203 Yes, first is a
letter O, second a zero.
bye,,,,,,,,,,,,,,(\
Yolanda ,,,,,,,,,,\\_/(\
UIN 4898262,,,..,,,Q Q \)
,,,,,,,,,,,,,,,,,=(_T_)=
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