1000BASE-SX GBIC specifications 51ATTENTIONYou must disable autonegotiation before operating the 1000BASE-T GBIC.By default, GBICs inserted into certain product-specific modules are setfor Autonegotiation = True. If autonegotiation does not work initially, Nortelrecommends that you reconfigure the switch to use a fixed-speed setting of 1000Mbit/s, full-duplex, on both sides.The maximum current requirement of the GBIC is 375 milliamperes (mA) at5 volts (V).The following table describes the 1000BASE-T GBIC.Table 31000BASE-T GBIC specificationsParameter SpecificationsStandards IEEE 802.3z, IEEE 802.3abConnectors RJ-45Cabling CAT5 unshielded twisted pair (UTP)Distance Up to 100 m1000BASE-SX GBIC specificationsThe 1000BASE-SX GBIC provides 1000BASE-SX Gigabit Ethernetconnectivity using SC duplex multimode fiber connectors. This GBICsupports full-duplex operation only. The part number of this GBIC isAA1419001-E5.The following table describes standards, connectors, cabling, and distancefor the 1000BASE-SX GBIC.CAUTIONWhen multimode fiber is used in long-distance applications,external, removable, mode-conditioning patch cords may berequired to prevent differential mode delay (DMD). Excessive DMDcan cause an increase in the bit error rate (BER). You can ordermode conditioning patch cords through Nortel:• SC-SC Mode-Conditioning Patch Cord 62.5/125 (partnumber AA0018035)• SC-SC Mode-Conditioning Patch Cord 50/125 (partnumber AA0018036)Nortel Metro Ethernet Routing Switch 8600Installation — SFP, XFP, and GBIC Hardware ComponentsNN46220-301 02.02 Standard4.2 13 November 2007Copyright © 2007, Nortel Networks.