6H12X-08 Overview6H128-08 and 6H129-08 User’s Guide1-31.3 6H12X-08 OVERVIEWThe 6H12X-08 (the 6H128-08 is shown in Figure 1-1) is a Fast Ethernetinterface module for the Cabletron Systems 6C105 chassis. The modulehas six switched fiber optic ports and two optional ports for Fast EthernetInterface Modules.The 6H128-08 has six multimode fiber optic 100BASE-FX switchedports using SC connectors, while the 6H129-08 has six single mode fiberoptic 100BASE-FX switched ports also using SC connectors.The 6H12X-08 supports IEEE 802.1D switching (bridging), Port BasedVLANs (IEEE 802.1Q), and Cabletron Systems SecureFast SwitchingVirtual Network technology. The 6H12X-08 is used to connect individualhigh-bandwidth user devices, such as workstations, and to provide acentral switching point for multiple 10/100 Mbps Fast Ethernet segments.1.3.1 ConnectivityThe 6H12X-08 connects to Ethernet networks or workstations through sixfiber optic ports with SC connections on the front panel. The 6H128-08supports multimode fiber SC ports, and the 6H129-08 supports singlemode fiber SC ports. The multimode ports are IEEE 802.3u 100BASE-FXcompliant.The 6H12X-08 has two front panel slots (ports 7 and 8) for optional FastEthernet Interface Modules (FE-100TX, FE-100FX, and FE-100F3) tosupport an uplink to 100 Mbps Fast Ethernet backbones or a high speedconnection to a local server using twisted pair, multimode or single modefiber optic cabling.1.3.2 Full Duplex Switched Ethernet (FDSE)Each switched Fast Ethernet port on the 6H12X-08 supports 100 Mbpsoperation and can be configured to operate in Full Duplex SwitchedEthernet (FDSE) mode. FDSE allows each Fast Ethernet port to provideup to 200 Mbps of throughput.
