Accton Technology RG211-2.3G User Manual
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APPENDIX C | Cables and PinoutsTwisted-Pair Cable Assignments– 77 –CROSSOVER W IRING If the twisted-pair cable is to join two ports and either both ports arelabeled with an “X” (MDI-X) or neither port is labeled with an “X” (MDI), acrossover must be implemented in the wiring. (When auto-negotiation isenabled for any RJ-45 port on this switch, you can use either straight-through or crossover cable to connect to any device type.)You must connect all four wire pairs as shown in the following diagram tosupport Gigabit Ethernet connections.Figure 42: Crossover WiringCABLE TESTING FOR E XISTING CATEGORY 5 C ABLEInstalled Category 5 cabling must pass tests for Attenuation, Near-EndCrosstalk (NEXT), and Far-End Crosstalk (FEXT). This cable testinginformation is specified in the ANSI/TIA/EIA-TSB-67 standard. Additionally,cables must also pass test parameters for Return Loss and Equal-Level Far-End Crosstalk (ELFEXT). These tests are specified in the ANSI/TIA/EIA-TSB-95 Bulletin, “The Additional Transmission Performance Guidelines for100 Ohm 4-Pair Category 5 Cabling.”Note that when testing your cable installation, be sure to include all patchcables between switches and end devices.White/Orange StripeOrangeWhite/Green Stripe1234567812345678EIA/TIA 568B RJ-45 Wiring Standard10/100BASE-TX Crossover CableEnd A End BGreenBlueWhite/Blue StripeBrownWhite/Brown Stripe |
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