The ComNet ™ CWGE24MODMS managed Ethernet switch chassis provides transmission of (24) Ethernet Ports with the use of three eight port expansion modules. This Ethernet switch is easily configurable by selecting, sold separately, eight port modules that allow for all copper, optical with four copper and four SFP modules, or all optical with SFP modules making the CWGE24MODMS switch available for use with either conventional CAT-5e copper or optical transmission media. When configured with eight-port modules that contain electrical ports, those port support 10/100/1000 Mbps Ethernet IEEE 802.3 protocol, and auto- negotiation and auto-MIDI/MIDX features are provided for simplicity and ease of installation. When configured with the CWGE24MOD/8FXSFP eight-port module that contains SFP optical ports, those ports operate at 1000 Mbps. The CWGE24MODMS and its corresponding modules are designed for installation in benign (0? to +45? C) operating environments.