Services, LANConnect, Inc.
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Services - Explanation of terms- LANConnect, Inc.
Circuit ID: This is an identification of the data or voice wire. This is specified by the customer. LANConnect labels both ends of all cable runs with computer generated labels.
Cable Test Standard: This describes the type of test run. Usually this is "CAT5 Basic Link" which confirms that the installed cabling conforms to the cabling system performance requirements for TSB-67.
Location: This is a free form field that can be specified by the customer.
Date Tested: Date the testing was completed
Local Module Type: The type of connector installed on the end of the cable where the testing is originating. Usually this is "Modular" which is an RJ-45.
Remote Module Type: The type of connector installed on the end of the cable opposite from where the testing is originating. Usually this is "Modular" which is an RJ-45.
Serial Number: This is the serial number of the test set used. This can be important if follow-up is deemed necessary.
Cable NVP: Nominal Velocity of Propagation. The speed of signal propagation through a cable, expressed as a percentage of the speed of light in a vacuum. This varies from manufacturer to manufacturer. It is necessary to measure the length of a cable run.
Test Summary: This is whether the cable Passed or Failed. LANConnect would never leave a cable in the Failed state.
Wire Map: This shows the pin configuration on each end of the wire, which would show, for example, if a wire were punched down to pin 2 on one end of the cable and pin 3 on the other. It also shows if the wire is shielded and grounded.
Length: The LANcat V uses a method called Time Domain Reflectometry (TDR) to measure the length of a cable. With TDR, a signal is transmitted at one end of a cable and, at the same time, a timer is started. The electrical signal travels down the cable until it reaches a change in impedance (for example, an open, a short, a fault in the cable or a cable mismatch) and part or all of the signal is reflected back. If the cable is properly terminated (that is, the terminator is equal the impedance of the cable), there will be no reflection and you will be able to determine the length. There will be some difference in the length readings of different pairs.
Attenuation: This test measures the reduction in signal as it travels over the length of a twisted pair cable. The amount of loss is expressed in decibels (dB). Attenuation varies with frequency and length. Typically, attenuation increases with higher frequencies and longer cables.
NEXT or Power Sum NEXT (Near-End CrossTalk): When a signal is transmitted onto one of the pairs, an electromagnetic field is created around the wires that couples the transmitted signal into adjacent pairs. This coupled signal is referred to as Crosstalk. If the crosstalk is severe enough, it can interfere with the received signal on another pair. Because NEXT is measured at the same end of the cable as the signal source, the NEXT test is performed from both ends of the cable run (Local and Remote). NEXT is the effect of one pair on another, Power Sum Next is the effect of the other 3 pairs combined on the tested pair.
ACR: The relationship between a cables Attenuation and NEXT ratings, where the signal is actually transmitted. It is expressed in decibels. The higher the ACR, the better the cable. For low end Cat5 cables this gap needs to be only 10 dB at 100 MHz. Levels 6 and 7 require 10dB 155 MHz and 200 MHz respectively for pair-to-pair, and 10 dB at 100 MHz and 160 MHz for Power Sum.