布线发展史
Wire Map Testing: It’s Not All About Color
Virtually every Ethernet cable tester can perform a wire map test - likely the most basic test for copper network cabling. Despite being a basic test, it is actually one of the most critical. And while the pair colors of blue, orange, green and brown might help you pass wire map testing, the test itself really doesn’t care about color at all.
Let’s take a closer look.
2018 年 9 月 6 日
2018 年 8 月 29 日
2018 年 8 月 22 日
The Road to 200 & 400 Gig is Already Paved (and Traveled)
The increasing demand for higher bandwidth to support Big Data has driven the need for ever-increasing Ethernet speeds, starting with 10 Gig in 2004 to the introduction in 2010 of 40 Gig with 4 fibers transmitting and 4 fibers receiving at 10 Gbps (40GBASE-SR4) and 100 Gig with 10 fibers transmitting and 10 fibers receiving at 10 Gbps (100GBASE-SR10).
2018 年 8 月 15 日
101 系列：To Splice or Not to Splice
Fiber splicing is a method of connecting two fibers, whereby two fibers are precisely cleaved and then aligned and fused using a fusion splicing machine. The fusion of two fibers is achieved by an electric arc that essentially welds the fibers together. A mass fusion splicer welds 12-fiber together at once and is performed using 12-fiber ribbon cable.
2018 年 8 月 8 日
Troubleshooting Installed Cable with DSX-5000 CableAnalyzer
It felt like a Monday morning when the call, actually an e-mail, came in. “I think my DSX is broken!”As you know, they are really tough machines and, when it looks like the Fluke is wrong, usually it isn’t.
“What makes you think it is broken?”I asked, “How does this failure manifest itself?”
“The tester is failing links that used to pass.”
2018 年 8 月 2 日
Why do I get “positive loss” when verifying a test cord?
Verification of test reference cords is easy, right? Yes, usually…but not always. After the power meter is set to 0 dB via the reference procedure, the loss of a mated connector pair is expected to be less than 0.20 dB for single-mode (e.g., -0.20 dB). Let’s examine one scenario where a loss is not negative (e.g., +0.15 dB).
The typical process for validating the loss of a connector, to verify if it is “reference grade” for example, is as follows:
2018 年 8 月 1 日
Testing in the Data Center Spaces
Depending in which functional area of the data center you are testing, there are different applications, cabling and connectivity that you will encounter. Understanding the functional areas of the data center and what you will likely need to test in each can help prepare you for data center testing.
2018 年 7 月 25 日
ANSI/TIA 568.2-D Approved!
The latest TIA standard for balanced twisted-pair cable systems – TIA 568.2-D – was approved for publication during the TR-42.7 meeting on 2018 年 6 月 12 日. It will replace TIA-568-C.2 and is expected to be published in the coming weeks.
For the past year (or more), we’ve been talking about many of the changes we will see in this standard, and now that it’s approved, we decided a recap is in order.Letter Swapping
2018 年 7 月 18 日
TIA 认可 MPTL 连接，您也会认可
If you are familiar with deployments where a horizontal cable run terminated on one end to an RJ-45 plug connects directly into a device, then you are familiar with what is now referred to as a Modular Plug Terminated Link, or MPTL (even if it wasn’t always referred to in this way).
2018 年 7 月 11 日
