Minimum 10Base100 Cable Length
Bookmark this page:
 Yahoo!
 Google
 Windows Live
 del.icio.us
 digg
 Netscape
|
|
||||||||||||||||||||||
|
Posted by Bob Holding on July 16, 2004, 9:32 am
Please log in for more thread options cable length, but there seems to be no consistency. Several sources state different lengths and include footnotes with different applications... So, I have two network devices sitting one on top of the other. They are an HA cluster that are using a 10Base100 heartbeat. The RJ-45 jacks on the two devices are approximately two inches apart. I would like the heartbeat cable to be as short as possible and adhere to cabling standards, but I can't find any hard reference to any IEEE specs for my situation... Can anyone help me justify a three inch heartbeat cable? Thanks. | ||||||||||||||||||||||
|
Posted by Thomas Beneken on July 16, 2004, 10:08 pm
Please log in for more thread options there is an issue with crosstalk. A very short cable doesn't decouple the NEXT of the two connectors. You end up with 3 dB less NEXT. But this should be no problem for 10BaseT or 100BaseT (Fast Ethernet). Thomas NEXT is Near End Crosstalk, generated by the connectors, cable contributes much less | ||||||||||||||||||||||
|
Posted by glen herrmannsfeldt on July 17, 2004, 7:52 am
Please log in for more thread options Thomas Beneken wrote:
> there is an issue with crosstalk. A very short cable doesn't decouple the
> NEXT of the two connectors. You end up with 3 dB less NEXT. But this should > be no problem for 10BaseT or 100BaseT (Fast Ethernet). That may be true, but in terms of signal to noise ratio, there is more signal so that a little more noise shouldn't cause much of a problem. There may be some fiber systems that will saturate the receiver if the cable is too short. -- glen | ||||||||||||||||||||||
|
Posted by Robert Redelmeier on July 17, 2004, 2:12 am
Please log in for more thread options > So, I have two network devices sitting one on top of
> the other. They are an HA cluster that are using a > 10Base100 heartbeat. The RJ-45 jacks on the two devices > are approximately two inches apart. I would like the > heartbeat cable to be as short as possible and adhere to > cabling standards, but I can't find any hard reference to > any IEEE specs for my situation... > Can anyone help me justify a three inch heartbeat cable?
I have in my hand such an interface crossover cables. Wire length about 8cm, and they ran 100baseTX full duplex without trouble at full speed (~12 MByte/s each direction). I also have made loopback plugs with 2cm total wire length. -- Robert | ||||||||||||||||||||||
| Similar Threads | Posted |
| Minimum 10Base100 Cable Length | July 16, 2004, 9:32 am |
| Cable length | July 18, 2006, 9:43 pm |
| Program to Estimate Cat 5 Cable Length | October 1, 2004, 4:52 pm |
| Power + DSL signal in same 700ft cable length | October 12, 2006, 6:35 pm |
| OTDR: Launch Cable Length for Singlemode | April 10, 2008, 2:50 pm |
| Re: Ethernet connection sensitive to cable length | May 3, 2008, 12:37 pm |
| Cabling length | December 1, 2005, 4:47 am |
| Average Length of Cat5 Run | August 25, 2004, 10:21 am |
| Maximum Length for 1000Base-SX | September 15, 2006, 2:25 pm |
| Looking for 2 MM LC-LC fiber cables 30m to 50m in length-surplus/cheap | October 6, 2004, 1:48 am |
| OTDR: Launch Cable; Receive Cable | April 10, 2008, 2:46 pm |
| Can I use a CAT5 cable as a TV Coax cable? | October 14, 2006, 2:13 pm |
| Which end is bad of cable | July 7, 2005, 10:51 pm |
| Cable Managers - 1U vs 2U | August 12, 2004, 11:01 pm |
| Re Cable Managers - 1U vs 2U | August 13, 2004, 10:28 am |
> cable length, but there seems to be no consistency. Several sources
> state different lengths and include footnotes with different
> applications...
>
> So, I have two network devices sitting one on top of the other. They
> are an HA cluster that are using a 10Base100 heartbeat. The RJ-45
> jacks on the two devices are approximately two inches apart. I would
> like the heartbeat cable to be as short as possible and adhere to
> cabling standards, but I can't find any hard reference to any IEEE
> specs for my situation...
>
> Can anyone help me justify a three inch heartbeat cable?
>
> Thanks.