Publication date: Feb., 2012Revision A1304, 5, 7, 8 Not used Not usedN OTE: The “+” and “-” signs represent the polarity of the wiresthat make up each wire pair.STRAIGHT-THROUGHWIRINGIf the twisted-pair cable is to join two ports and only one of theports has an internal crossover (MDI-X), the two pairs of wiresmust be straight-through. (When auto-negotiation is enabled forany RJ-45 port on this switch, you can use eitherstraight-through or crossover cable to connect to any devicetype.)You must connect all four wire pairs as shown in the followingdiagram to support Gigabit Ethernet.Figure 20: Straight-through WiringEIA/TIA 568B RJ-45 Wiring Standard10/100BASE-TX Straight-through CableCROSSOVERWIRINGIf the twisted-pair cable is to join two ports and either both portsare labeled with an “X” (MDI-X) or neither port is labeled with an“X” (MDI), a crossover must be implemented in the wiring. (Whenauto-negotiation is enabled for any RJ-45 port on this switch, youcan use either straight-through or crossover cable to connect toany device type.)You must connect all four wire pairs as shown in the followingdiagram to support Gigabit Ethernet.Figure 21: Crossover WiringEIA/TIA 568B RJ-45 Wiring Standard10/100BASE-TX Crossover Cable