A major application of media converters is to make use of optical fiber as the transmission media for extending the reach of interfaces between two locations. Media converters are deployed in pairs, typically between a two CO sides or between a CO and CPE location or between two CPE locations. The Ethernet media converter should be transparent to Layer 2 and Layer 3 protocols including, IEEE 802.1q, VLAN tag, Spanning Tree Protocol, IPX, IP etc.
