The ComNet CNGE2MC is a single (1) channel Ethernet converter from electrical to optical and optical to electrical. The CNGE22MC is a two (2) CHANNEL Ethernet converter in a single package. These devices accept a 10/ 100 or 1000 Mbps (Megabits Per Second) electrical input and converts this to a 1000 Mbps (1Gbs) optical output and the 1 Gbs optical input back to the 10/ 100/ 1000 Mbps electrical output. This conversion is call "Auto-Negotiating" and is automatically performed by the electronics. These devices use either one or two optical fibers, depending upon the specific optical module used. The optical module is called a Small Form Factor Pluggable (SFP) and typically uses a ComNet SFP-6 module. The LED (light emitting diode) indicators display that the Optical Link is connected and that there is Data activity on the channel.