The Spirent Smartbits LAN-3111As is a 6-port, full duplex, Fast Ethernet Fiber SmartMetrics module for the SMB-600 or SMB-6000B chassis. The main function of the LAN-3111As is to test the performance and interoperability of Layer 3 devices, but the module can also be used to test Layer 2. The LAN-3111As is capable of full wire-rate traffic generation and analysis. 100Base-FX Ethernet, 6-port, single mode,. 1310nm, SmartMetrics module High port density -- facilitates easy and rapid simulation of large, complex network configurations Full wire-rate traffic generation and analysis -- enables stress testing and performance analysis. Data integrity checking -- allows verification of payload data through the DUT