The Spirent Smartbits LAN-3101B is a 6-port, full/half duplex, Ethernet/Fast Ethernet SmartMetrics module for the SmartBits 600x or 6000x chassis. Two LAN-3101B modules (12 ports) may be used in a SmartBits 600x chassis. Up to twelve LAN-3101B modules may be used in a SmartBits 6000x chassis, providing a total of 72 SmartMetrics ports. The LAN-3101B is designed for IEEE-compliant 10Base-T and 100Base-TX systems and supports auto-negotiation, VLAN tagging, and flow control per the IEEE standards 802.3p, 802.3Q, 802.3ac, and 802.3x.