10Base2 Resistance Question
Bookmark this page:
 Yahoo!
 Google
 Windows Live
 del.icio.us
 digg
 Netscape
|
|
|||||||||||||||||||||||||||||||||||||||||||
|
Posted by james.thompson on July 5, 2006, 2:56 pm
Please log in for more thread options I am trying to troubleshoot a 10Base2 network running over RG58U cable. I have a length about 500 feet long that is not working for carrying network traffic. I terminated one end with a terminator that I metered at 49.0 Ohms. When I then meter the cable it comes back at 54.6 Ohms. Is this a significant enough difference to keep the cable from carrying network traffic? I am unfamiliar with 10Base2 networking characteristics so I apologize if this may be a silly question. Thanks, James Thompson Oneida, KY | |||||||||||||||||||||||||||||||||||||||||||
|
Posted by David Lesher on July 5, 2006, 11:26 pm
Please log in for more thread options No. That's not the issue. You do have TWO terminators, one at each end, right? -- A host is a host from coast to coast.................wb8foz@nrk.com & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433 | |||||||||||||||||||||||||||||||||||||||||||
|
Posted by Carl Lowenstein on July 6, 2006, 1:01 am
Please log in for more thread options
>
>>I am trying to troubleshoot a 10Base2 network running over RG58U cable.
>>I have a length about 500 feet long that is not working for carrying >>network traffic. I terminated one end with a terminator that I metered >>at 49.0 Ohms. When I then meter the cable it comes back at 54.6 Ohms. >>Is this a significant enough difference to keep the cable from carrying >>network traffic? >
> >No. That's not the issue. You do have TWO terminators, one at each end, >right? Sanity check. According to my calculations, the center conductor of RG58U cable has a resistance of about 12 ohms/1000 ft. The coax braid adds insignificently to this. Anyhow this means that the measured resistance of 500 ft of cable + terminator will be about 6 ohms greater than the terminator by itself. This of course is not measured in the presence of the near-end terminator. carl -- carl lowenstein marine physical lab u.c. san diego clowenst@ucsd.edu | |||||||||||||||||||||||||||||||||||||||||||
|
Posted by james.thompson on July 6, 2006, 9:15 am
Please log in for more thread options
David, The measurement was take with only one end terminated. When I connect the cable to the actual switches at either end of the line I install both terminatros. Now, since this was setup before I ever came here there is one other peculiarity: none of the terminators are grounded, could this cause an issue? James Thompson Oneida, KY Carl Lowenstein wrote: > >
> >>I am trying to troubleshoot a 10Base2 network running over RG58U cable.
> >>I have a length about 500 feet long that is not working for carrying > >>network traffic. I terminated one end with a terminator that I metered > >>at 49.0 Ohms. When I then meter the cable it comes back at 54.6 Ohms. > >>Is this a significant enough difference to keep the cable from carrying > >>network traffic? > >
> > > >No. That's not the issue. You do have TWO terminators, one at each end, > >right? >
> Sanity check. According to my calculations, the center conductor of RG58U > cable has a resistance of about 12 ohms/1000 ft. The coax braid adds > insignificently to this. Anyhow this means that the measured resistance > of 500 ft of cable + terminator will be about 6 ohms greater than the > terminator by itself. > > This of course is not measured in the presence of the near-end terminator. > > carl > -- > carl lowenstein marine physical lab u.c. san diego > clowenst@ucsd.edu | |||||||||||||||||||||||||||||||||||||||||||
|
Posted by Al Dykes on July 6, 2006, 9:44 am
Please log in for more thread options
>David,
> >The measurement was take with only one end terminated. When I connect >the cable to the actual switches at either end of the line I install >both terminatros. Now, since this was setup before I ever came here >there is one other peculiarity: none of the terminators are grounded, >could this cause an issue? I've never seen gounding, or lack of it, causing a problem with thinwire, but one end should be grounded. What is your actual problem? -- a d y k e s @ p a n i x . c o m Don't blame me. I voted for Gore. A Proud signature since 2001 | |||||||||||||||||||||||||||||||||||||||||||
| Similar Threads | Posted |
| 10Base2 Resistance Question | July 5, 2006, 2:56 pm |
| Fiber question | November 16, 2004, 6:24 pm |
| Telephone question | October 23, 2004, 12:23 am |
| Question about Cat 7 cable | February 1, 2005, 2:03 pm |
| 10BaseT Question | December 29, 2005, 3:44 pm |
| Re: newbie cat 5 question! | May 29, 2008, 3:35 pm |
| RJ45 connector question | July 8, 2004, 2:55 pm |
| newbie cabling question | August 24, 2004, 3:17 pm |
| Yet another price per drop question | January 10, 2005, 1:08 am |
| 66/110 blocks - newbie question | May 18, 2005, 12:35 pm |
| DSL router cabling question | February 8, 2006, 12:53 pm |
| Powerline Networking Question | March 2, 2006, 10:39 am |
| Cable Substitution Question | March 6, 2006, 10:50 am |
| real basic question | August 10, 2006, 1:36 pm |
| Telephone Wiring Question | November 4, 2006, 11:33 pm |
>I have a length about 500 feet long that is not working for carrying
>network traffic. I terminated one end with a terminator that I metered
>at 49.0 Ohms. When I then meter the cable it comes back at 54.6 Ohms.
>Is this a significant enough difference to keep the cable from carrying
>network traffic?