Comments on: Gigabit Network http://chris.pirillo.com/gigabit-network/ News and Reviews! Geek, Internet Entrepreneur, Hardware Addict, Software Junkie, Book Author, Once TV Show Host, Technology Enthusiast, Shameless Self-Promoter, Tech Conference Coordinator, Early Adopter, Idea Evangelist, Tech Support Blogger, Bootstrapper, Media Personality, Technology Consultant, Thicker Quicker Picker Upper. Thu, 16 Feb 2012 07:00:00 +0000 hourly 1 http://wordpress.org/?v=3.3 By: sivakumar http://chris.pirillo.com/gigabit-network/#comment-589815 sivakumar Mon, 11 Feb 2008 11:30:47 +0000 http://chris.pirillo.com/2007/06/01/gigabit-network/#comment-589815 how does the physical construction of cat 5e & Cat 6 cables different from each other? If one goes through the specifications - it says Cat 6 is 12 times less noisy ?? Also the bandwidth of Cat 6 is twice of Cat 5e ?? How is it accomplished ?? After all cable is a cable !!!! May be the thickness will change & may be the copper purity may change !!! can any one throw more light on this how does the physical construction of cat 5e & Cat 6 cables different from each other? If one goes through the specifications – it says Cat 6 is 12 times less noisy ?? Also the bandwidth of Cat 6 is twice of Cat 5e ??

How is it accomplished ??

After all cable is a cable !!!! May be the thickness will change & may be the copper purity may change !!!

can any one throw more light on this

]]> By: Cim http://chris.pirillo.com/gigabit-network/#comment-535765 Cim Sun, 03 Jun 2007 19:48:39 +0000 http://chris.pirillo.com/2007/06/01/gigabit-network/#comment-535765 I have worked on gigabit (1000Base-T) algorithm and chip development and the 1000Base-T standard (802.3ab) is actually designed to operate up to 100m on Category 5 cable. One does not necessarily need Cat-5e or Cat-6 to meet these requirements. The major speed improvement in Gigabit Ethernet is accomplished by transmitting and receiving on all four pairs in the cabling (10Base-T and 100Base-TX used only two pairs -- one for TX and one for RX). It transmits at 125 Mbaud on each pair with an effective 2-bits per symbol. This gives 4 pairs * 125M sym/sec * 2 bits/sym = 1000 Mbps. One of the major impairments for 1000Base-T operation is something called NEXT (near-end crosstalk) which occurs when data from one pair couples on to another. This mainly occurs at the jacks/patch panels where the twists in the pair are undone to crimp a RJ-45 jack or attach to a panel. To maximize performance in a network, one should keep the connections to a panel or jack as short as possible so that each pair is kept twisted as much as possible. A poor installation will have a much more dramatic effect on 1000Base-T operation than the category type of cabling. I have worked on gigabit (1000Base-T) algorithm and chip development and the 1000Base-T standard (802.3ab) is actually designed to operate up to 100m on Category 5 cable. One does not necessarily need Cat-5e or Cat-6 to meet these requirements.

The major speed improvement in Gigabit Ethernet is accomplished by transmitting and receiving on all four pairs in the cabling (10Base-T and 100Base-TX used only two pairs — one for TX and one for RX). It transmits at 125 Mbaud on each pair with an effective 2-bits per symbol. This gives 4 pairs * 125M sym/sec * 2 bits/sym = 1000 Mbps.

One of the major impairments for 1000Base-T operation is something called NEXT (near-end crosstalk) which occurs when data from one pair couples on to another. This mainly occurs at the jacks/patch panels where the twists in the pair are undone to crimp a RJ-45 jack or attach to a panel. To maximize performance in a network, one should keep the connections to a panel or jack as short as possible so that each pair is kept twisted as much as possible. A poor installation will have a much more dramatic effect on 1000Base-T operation than the category type of cabling.

]]> By: Jzilla http://chris.pirillo.com/gigabit-network/#comment-535870 Jzilla Sun, 03 Jun 2007 04:57:04 +0000 http://chris.pirillo.com/2007/06/01/gigabit-network/#comment-535870 One other thing to keep in mind is that cat 6 cable is not as flexible as cat 5e, as it has an inner core to keep the twisted pairs of wires properly spaced. If cat 6 is bent too much it can have an adverse effect on the throughputs achieved. Having said that it makes more sense to run cat 6 cable if possible as it is usually easier to upgrade the equipment at each end than the cable itself. One other thing to keep in mind is that cat 6 cable is not as flexible as cat 5e, as it has an inner core to keep the twisted pairs of wires properly spaced. If cat 6 is bent too much it can have an adverse effect on the throughputs achieved.

Having said that it makes more sense to run cat 6 cable if possible as it is usually easier to upgrade the equipment at each end than the cable itself.

]]> By: Charles Linquist http://chris.pirillo.com/gigabit-network/#comment-535871 Charles Linquist Sun, 03 Jun 2007 04:50:26 +0000 http://chris.pirillo.com/2007/06/01/gigabit-network/#comment-535871 About 8 years ago, I wired my house with cat5. Then, 3 years ago, I bought a motherboard that had a gigabit port. At the same time, I upgraded all my switches. I now have 7 computers in my house on the gigE network, and all work fine. Some of my cable runs are 120' long and I have found no issues whatsoever. I get transfer speeds about 6 times greater than on 100Mbit - definitely useful for moving around video files. About 8 years ago, I wired my house with cat5. Then, 3 years ago, I bought a motherboard that had a gigabit port. At the same time, I upgraded all my switches. I now have 7 computers in my house on the gigE network, and all work fine. Some of my cable runs are 120′ long and I have found no issues whatsoever. I get transfer speeds about 6 times greater than on 100Mbit – definitely useful for moving around video files.

]]> By: Charles Linquist http://chris.pirillo.com/gigabit-network/#comment-535872 Charles Linquist Sun, 03 Jun 2007 04:50:26 +0000 http://chris.pirillo.com/2007/06/01/gigabit-network/#comment-535872 About 8 years ago, I wired my house with cat5. Then, 3 years ago, I bought a motherboard that had a gigabit port. At the same time, I upgraded all my switches. I now have 7 computers in my house on the gigE network, and all work fine. Some of my cable runs are 120' long and I have found no issues whatsoever. I get transfer speeds about 6 times greater than on 100Mbit - definitely useful for moving around video files. About 8 years ago, I wired my house with cat5. Then, 3 years ago, I bought a motherboard that had a gigabit port. At the same time, I upgraded all my switches. I now have 7 computers in my house on the gigE network, and all work fine. Some of my cable runs are 120′ long and I have found no issues whatsoever. I get transfer speeds about 6 times greater than on 100Mbit – definitely useful for moving around video files.

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