I was looking at the cables and seen that one is RG-58 and the other is
RG-62
-Joey
Robert Foxworth wrote:
>
>
>>From google I found out that it is 10Base2 thin net.
>>
>>
>>Eben King wrote:
>>
>>
>>
>>>On Sat, 7 Aug 2004, Joey Dale wrote:
>>>
>>>
>>>
>>>
>>>
>>>>I just got about 200ft of coaxial ethernet cable (RG85) with N
>>>>connecters, and would like to hook my buddy into my network
>>>>
>>>>
>
>
>If this is indeed 10Base2 then the designation for the coax
>is RG-58, and not RG-85. Is it REALLY 85? (I never heard of
>this number)
>
>BTW this length 200 feet technically is out of spec, but usually works
>if
>you push it just a bit.
>
>
>
>>>If the cable has to go outdoors, you should use something
>>>
>>>
>nonconductive
>
>
>>>(computers aren't lightning-safe), like fiber or radio.
>>>
>>>
>
>This is 100% correct. A lot of it has to do with the fact that the
>building grounds are not referenced together and in a lightning hit
>on a building, one side of the wire can rise thousands of volts
>above the other side, this will fry a lot of equipment. There exists
>polyphasers to help with this.
>
>
>
>
>>>>Anyway, does anyone have a few pci coax ethernet cards for
>>>>
>>>>
>free/trade.
>
>The old coax connector on these NICs is the BNC connector.
>The consensis is that BNC stands for Bayonet Neill Concelman
>(2 men's names) though other 'solutions' also exist, such as British
>Naval Connector. AN on-going debate, this.
>
>
>
>
>>>I know there are some ISA ones here that you're welcome to. No PCI,
>>>AFAIK. If ISA's no good, you might try a second-hand computer store.
>>>Microstar on S Dale Mabry used to have a decent selection.
>>>
>>>
>
>
>I believe every NIC you will find today with a BNC connector fits an
>ISA bus and runs at 10 Mbit/s signaling rate, not 10/100. This
>BNC connector fits RG-58 and is the accepted physical media for
>the 10Base2 protocol (2 = 200 meters, though really 185 m)
>
>I have a bunch of SMC 8416 (83C795 chip) that work well
>(EtherEZ) with BNC and RJ-45 but they are ISA bus.
>
>
>
>
>>>>Also what are the correct terms for this (thicknet?) (N connecter?)
>>>>
>>>>
>
>The N series connector is intended for 10Base5 cabling, which is the
>coax that is approx. 1/2 inch in diameter. Applying an N connector
>to this wire is generally done with a specialized AMP crimping tool
>that crimps both the center pin and the braid collar. I've made a few
>dozen of them in my lifetime. The taps are done with a "vampire tap"
>requiring a clamp jig and a coring tool. THIS is "thicknet" and again
>is rated for only 10 Mbit. (See: Cabletron ST-500 AUI transceiver).
>Max cable length = 500 m.
>
>Now there DOES exist a N connector with a narrow collar, intended for
>RG-58 but then you need a between-series-adapter on each end to
>convert the N connector to a BNC. These will cost more than new NICs,
>or else you need to construct two pigtails. These are never
>perfect and always cause impedance discontinuities which sometimes
>are a problem. You need a TDR to find these problems. ( TDR == $6k)
>
>My recollection is that in 1990 when this was the state of the art,
>the AMP tool alone cost about $400. The handles were about
>15 inches long. Once the ratcheting began there was no way to
>release it unless you went through the whole crimp sequence.
>If there was a misalignment in the connector pieces, tough.
>
>All you guys who think that UTP was the beginning of networking,
>ha ha. You don't know what you have missed out on.
>
>Good luck with the coax. I would definitely NOT run it between
>buildings.
>
>Bob
>
>PS - did I say to avoid running it between buildings ???
>
>
>
>
>>>10Base2?
>>>
>>>
>>>
>
>
>
>
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