Support up to 24 users or devices Internal switch seamlessly integrates between 10 Mbps and 100 Mbps segments. Autosensing ports match attached device speeds to optimize performance Features many of the same reliability and redundancy features found on more expensive hubs. Easy expansion with an MDI-MDIX port; each hub in the stack acts as a single. Fast Ethernet Class II repeater Plug-and-play design simplifies installation and operation. Clearly labeled, color-coded status. LEDs facilitate monitoring Optional backup power protects operation. Installs as a freestanding unit or in a wiring closet. Package contents Hub, Power adapter and cable, Rubber feet, Rack mounting kit, User's guide Ports per hub 24 10/100 Mbps Ethernet Media interface 24 10BASE-T/100BASE-TX, RJ-45 connectors System LEDs Power, Network Traffic, Collisions, LAN Segment Power requirements Input voltage 100240V; frequency: 50/60 Hz: consumption: 25/42W Optional backup power SuperStack 3 Advanced Redundant Power System with 100W Type 2 power module MAC addresses 4,000 Hub type FCC Class A Part 15 Subpart B, EN55022 Class A Physical dimensions Height: 4.4 cm (1.7 in) Width: 44.0 cm (17.3 in) Depth: 17.3 cm (6.8 in).