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#1
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Cat 6 cable - Page56.pdf (0/1)
Here is my first try: |
#2
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Cat 6 cable - Page56.pdf (0/1)
"josephkk" wrote in message ... Here is my first try: I see both pdf's Cheers |
#3
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Cat 6 cable - Page56.pdf (0/1)
On Mon, 07 Nov 2011 19:37:53 -0800, josephkk
wrote: Here is my first try: That worked fine. The page specifies a max prop delay of 555 ns, but doesn't specify the length of the cable. Sounds like about 100 meters maybe. The skew spec is awesome: 50 ns, or about 10% of the prop delay. That's scary. John |
#4
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Cat 6 cable - Page56.pdf (0/1)
On Mon, 07 Nov 2011 20:08:40 -0800, John Larkin wrote:
On Mon, 07 Nov 2011 19:37:53 -0800, josephkk wrote: Here is my first try: That worked fine. The page specifies a max prop delay of 555 ns, but doesn't specify the length of the cable. Sounds like about 100 meters maybe. The skew spec is awesome: 50 ns, or about 10% of the prop delay. That's scary. The method used to control crosstalk in UTP cables is to vary the twist rate between pairs, so there is a pretty good difference in length of wire between the pair with the slowest twist and the pair with the fastest twist. IIRC the construction of Cat cables has both increased the twist difference and tightened up the twist tolerance with every increase in speed grade, to I would expect the skew in Cat 6a to be the worst, but the most predictable. |
#5
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Cat 6 cable - Page56.pdf (0/1)
On 08 Nov 2011 17:32:33 GMT, Glen Walpert wrote:
On Mon, 07 Nov 2011 20:08:40 -0800, John Larkin wrote: On Mon, 07 Nov 2011 19:37:53 -0800, josephkk wrote: Here is my first try: That worked fine. The page specifies a max prop delay of 555 ns, but doesn't specify the length of the cable. Sounds like about 100 meters maybe. The skew spec is awesome: 50 ns, or about 10% of the prop delay. That's scary. The method used to control crosstalk in UTP cables is to vary the twist rate between pairs, so there is a pretty good difference in length of wire between the pair with the slowest twist and the pair with the fastest twist. IIRC the construction of Cat cables has both increased the twist difference and tightened up the twist tolerance with every increase in speed grade, to I would expect the skew in Cat 6a to be the worst, but the most predictable. Apparently you can buy two kinds of CAT6A cable, individually shielded and not. I'd hope that the individually shielded stuff has the same twist on all the pairs. John |
#6
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Cat 6 cable - Page56.pdf (0/1)
On Mon, 7 Nov 2011 22:45:29 -0500, "Martin Riddle"
wrote: "josephkk" wrote in message .. . Here is my first try: I see both pdf's Cheers You are the only one that has reported seeing both. Even i don't; Agent 6 in wine over openSuse linux. What do you use? ?-) |
#7
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Cat 6 cable - Page56.pdf (0/1)
In article ,
josephkk wrote: On Mon, 7 Nov 2011 22:45:29 -0500, "Martin Riddle" wrote: "josephkk" wrote in message .. . Here is my first try: I see both pdf's Cheers You are the only one that has reported seeing both. Even i don't; Agent 6 in wine over openSuse linux. What do you use? I also see both. -- Regards, John Byrns Surf my web pages at, http://fmamradios.com/ |
#8
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Cat 6 cable - Page56.pdf (0/1)
flipper wrote: On Sat, 12 Nov 2011 22:42:49 -0600, John Byrns wrote: In article , josephkk wrote: On Mon, 7 Nov 2011 22:45:29 -0500, "Martin Riddle" wrote: "josephkk" wrote in message .. . Here is my first try: I see both pdf's Cheers You are the only one that has reported seeing both. Even i don't; Agent 6 in wine over openSuse linux. What do you use? I also see both. So do I I see two posts of 211 lines, posted 10:37 PM & 10:41 PM. -- You can't have a sense of humor, if you have no sense. |
#9
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Cat 6 cable - Page56.pdf (0/1)
flipper wrote: On Sun, 13 Nov 2011 03:18:40 -0500, "Michael A. Terrell" wrote: flipper wrote: On Sat, 12 Nov 2011 22:42:49 -0600, John Byrns wrote: In article , josephkk wrote: On Mon, 7 Nov 2011 22:45:29 -0500, "Martin Riddle" wrote: "josephkk" wrote in message .. . Here is my first try: I see both pdf's Cheers You are the only one that has reported seeing both. Even i don't; Agent 6 in wine over openSuse linux. What do you use? I also see both. So do I I see two posts of 211 lines, posted 10:37 PM & 10:41 PM. Same here except I'm in a different time zone so my reader says 9:37 PM and 9:41 PM Propagation of ABSE has always been flaky. -- You can't have a sense of humor, if you have no sense. |
#10
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Cat 6 cable - Page56.pdf (0/1)
flipper wrote: Michael A. Terrell wrote: Propagation of ABSE has always been flaky. That's not propagation. It's just that my clocks point to a different hour for the same UTC. I'm talking about some people not seeing it on their chosen news server, or only seeing one of the two posts. -- You can't have a sense of humor, if you have no sense. |
#11
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Cat 6 cable - Page56.pdf (0/1)
"josephkk" wrote in message ... On Mon, 7 Nov 2011 22:45:29 -0500, "Martin Riddle" wrote: "josephkk" wrote in message . .. Here is my first try: I see both pdf's Cheers You are the only one that has reported seeing both. Even i don't; Agent 6 in wine over openSuse linux. What do you use? ?-) Eternal September and Windows Live mail. Cheers |
#12
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Cat 6 cable - Page56.pdf (0/1)
On Wed, 09 Nov 2011 17:04:05 -0800, John Larkin wrote:
On 08 Nov 2011 17:32:33 GMT, Glen Walpert wrote: On Mon, 07 Nov 2011 20:08:40 -0800, John Larkin wrote: On Mon, 07 Nov 2011 19:37:53 -0800, josephkk wrote: Here is my first try: That worked fine. The page specifies a max prop delay of 555 ns, but doesn't specify the length of the cable. Sounds like about 100 meters maybe. The skew spec is awesome: 50 ns, or about 10% of the prop delay. That's scary. The method used to control crosstalk in UTP cables is to vary the twist rate between pairs, so there is a pretty good difference in length of wire between the pair with the slowest twist and the pair with the fastest twist. IIRC the construction of Cat cables has both increased the twist difference and tightened up the twist tolerance with every increase in speed grade, to I would expect the skew in Cat 6a to be the worst, but the most predictable. Apparently you can buy two kinds of CAT6A cable, individually shielded and not. I'd hope that the individually shielded stuff has the same twist on all the pairs. John There are also two types of shielded CAT6A; fully shielded and semi- shielded, which consists of unconnected bands of foil shielding not connected to anything, providing an additional 10 dB reduction in crosstalk (at 10 GBPS) without requiring a signal common to connect the shield to. Fully shielded provides even more reduction in crosstalk, but I am pretty sure all varieties use twist pitch variation also, including CAT7 which is only available in fully shielded. Shielding is never 100% effective, so twist variation is still beneficial. If low skew is more important than low crosstalk then a CAT type cable is probably not a good choice. You could make your own cable from 4 pieces of the same single STP cable for very low volumes, or have someone like Cooner Cable make a custom cable for you. I might have mentioned this last week but I have been out of internet range again (Adirondacks). Went out for a short canoe trip yesterday morning, but had to cut it short when we came to a spot where the choppy water (20 to 30 MPH wind) suddenly turned smooth as far ahead as we could see :-). Glen |
#13
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Cat 6 cable - Page56.pdf (0/1)
On Wed, 09 Nov 2011 17:04:05 -0800, John Larkin wrote:
On 08 Nov 2011 17:32:33 GMT, Glen Walpert wrote: On Mon, 07 Nov 2011 20:08:40 -0800, John Larkin wrote: On Mon, 07 Nov 2011 19:37:53 -0800, josephkk wrote: Here is my first try: That worked fine. The page specifies a max prop delay of 555 ns, but doesn't specify the length of the cable. Sounds like about 100 meters maybe. The skew spec is awesome: 50 ns, or about 10% of the prop delay. That's scary. The method used to control crosstalk in UTP cables is to vary the twist rate between pairs, so there is a pretty good difference in length of wire between the pair with the slowest twist and the pair with the fastest twist. IIRC the construction of Cat cables has both increased the twist difference and tightened up the twist tolerance with every increase in speed grade, to I would expect the skew in Cat 6a to be the worst, but the most predictable. Apparently you can buy two kinds of CAT6A cable, individually shielded and not. I'd hope that the individually shielded stuff has the same twist on all the pairs. John I just happened to notice that Belden claims a patented "all pairs identical" construction (without explaining exactly what that means) with a guaranteed skew limit of 25 ns per 100 meters with CAT5e UTP. You could call their tech support number to see if this (or something else they make) actually has identical twist on all pairs. (Their CAT6 and CAT6A cables have skew limits of 30 and 35 ns respectively, probably indicative of increasing twist differences). http://www.belden.com/docs/upload/NP288.pdf |
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