Nortel 1000BASE-XD Using Manual

Also see for 1000BASE-XD: Installation guide

Contents

Using the Passport 8100 Modules4-4 204515-CPort Connection ProblemsPort connection problems can usually be traced to a poor cable connection or to animproper connection of the port cables at either end of the link. These types ofproblems can be remedied by making sure that the cable connections are secureand that the cables are connected to the correct ports at both ends of the link.For more information about cabling, see “Cabling,” next in this chapter.Port connection problems can also be traced to the autonegotiation mode (refer to“Autonegotiation Modes” on page 4-5) or the port interface.CablingCabling for 10BASE-T networks can consist of 2-pair Category 3, 4, or 5unshielded twisted pair (UTP) wiring. However, to cover future upgrades to FastEthernet, Nortel Networks strongly recommends that you use all Category 5 cablein your network.Ethernet 10BASE-T network installations use cables consisting of two pairs oftwisted pair wires—one pair to send data and one to receive data. These wiresmust connect to another 10BASE-T station that has the sending pair attached to itsreceiving pair and vice versa. In this way, the two nodes can exchange data. If thetwo nodes are wired alike, they both attempt to send data out on the sameRJ-45 pins. In such a case, a straight-through cable would not work. However, acrossover cable would operate normally.The Passport 8100 Series modules are designed to have Ethernet NICs connectdirectly to their RJ-45 ports using straight-through (MDI) cables. However, if aPassport 8100 module must connect to a hub or another switch that follows usualconventions, a crossover cable (MDI-X) is required.The 100 Mb/s ports are designed to operate using Category 5 UTP cabling only.Category 5 UTP cable is a 2-pair cable certified to handle up to 100 Mb/sbandwidth. To minimize crosstalk noise, maintain the twist ratio of the cable up tothe point of termination; untwist at any termination should not exceed 0.5 inch(1.27 cm).For best performance with respect to noise immunity and emissions, the unusedpairs in the 2-pair cable should be terminated at their characteristic impedance(that is, 100 ohms) in the equipment at each end of the cable. All Nortel Networks100BASE-TX equipment includes such a Common Mode Termination (CMT).