Click on the comments link to post a question. It will be set up as a new post or email me and I'll add it to the Blog for you.
Wednesday, June 20, 2007
Tuesday, June 19, 2007
Crosstalk Reduction
Here's a couple of questions I have received recently
***********************************************
I have a question regarding crosstalk between data cables in a bundle. It is my understanding that cable cross-talk is potentially greater when cables in a bundle lie parallel to each other, and lie in the closest possible bundle configuration. However, data center installers like to install the cable in this very 'neat' configuration for aesthetics and space savings. Is there any way to reduce this crosstak (besides using a better cable). For example, I noticed that the four twisted pairs in data cable are also twisted around each other. Could the entire bundle of data cable be twisted to improve cross-talk performance?
***********************************************
Hi
I am a certified cabling designer and Installer.
I have a question. I tried but failed to find a good answer. Can you help me.
I was discussing with a friend of mine who is in the same field as me.
The horizontal cables when entering in the MDF/IDF room should be combed parallel to each other or not. Should they be left mingled and sorted when they are near the patch panel? Should it be combed and all the cables from false ceiling to the entering the cabinet be combed for aesthetic reason. Or it should remain mingled as the UTP cables are twisted inside their jackets.
I believe combing the UTP cables and make them run in parallel to each other may produce noise or some other distortion in the transmit or receive of signals.
***********************************************
I have a question regarding crosstalk between data cables in a bundle. It is my understanding that cable cross-talk is potentially greater when cables in a bundle lie parallel to each other, and lie in the closest possible bundle configuration. However, data center installers like to install the cable in this very 'neat' configuration for aesthetics and space savings. Is there any way to reduce this crosstak (besides using a better cable). For example, I noticed that the four twisted pairs in data cable are also twisted around each other. Could the entire bundle of data cable be twisted to improve cross-talk performance?
***********************************************
Hi
I am a certified cabling designer and Installer.
I have a question. I tried but failed to find a good answer. Can you help me.
I was discussing with a friend of mine who is in the same field as me.
The horizontal cables when entering in the MDF/IDF room should be combed parallel to each other or not. Should they be left mingled and sorted when they are near the patch panel? Should it be combed and all the cables from false ceiling to the entering the cabinet be combed for aesthetic reason. Or it should remain mingled as the UTP cables are twisted inside their jackets.
I believe combing the UTP cables and make them run in parallel to each other may produce noise or some other distortion in the transmit or receive of signals.
Sunday, November 26, 2006
NEW!!! The Network Cabling Help Blog!
Welcome to the new Network Cabling Help Blog. Please feel free to post your cabling related questions, views, moans etc. and see what the rest of the world has to say about your comments.
Regards
Ian Patrick
Network Cabling Help
http://www.datacottage.com/
Regards
Ian Patrick
Network Cabling Help
http://www.datacottage.com/
Network Cabling Help
Why are RJ45's wired with pair 2 straddling pair 3? I think it's a throw back to old telephone cabling but it still doesn't make sense!
Monday, November 20, 2006
The Perfect RJ45 Connection
Does anyone know how to make the perfect RJ45 connection?
I have noticed that some high quality test leads have one of the wires going to pins 3 or 6 crossing the middle pair at right angles. I think the theory behind this is that crosstalk is minimised by doing it this way and it improves insertion loss.
Do you know anything about this? does it work?
I haven't tried this yet but it looks kinda fiddly to do, and probably adds quite a bit onto termination time.
What do you think?
I have noticed that some high quality test leads have one of the wires going to pins 3 or 6 crossing the middle pair at right angles. I think the theory behind this is that crosstalk is minimised by doing it this way and it improves insertion loss.
Do you know anything about this? does it work?
I haven't tried this yet but it looks kinda fiddly to do, and probably adds quite a bit onto termination time.
What do you think?
Subscribe to:
Posts (Atom)
