The EX 4550, which is available with both fiber and copper interfaces, includes Juniper’s unique Virtual Chassis technology, enabling multiple interconnected switches to operate as a single, logical device.
The EX4550 Ethernet Switch offers 32 wire-speed GbE or 10GbE pluggable ports in a compact one rack unit base platform. It includes two expansion slots, one in front and one in back, that accommodate optional expansion modules that can increase the EX4550’s density to 48 wire-speed GbE or 10GbE ports, delivering 480 Gbps of Layer 2 and Layer 3 connectivity.
The switch can participate in the same Virtual Chassis configuration with EX4200 Ethernet switches, making its suitable for customers migrating from 1GbE to 10GbE servers.
http://www.juniper.net/us/en/products-services/switching/ex-series/ex4500/
http://forums.juniper.net/t5/The-New-Network/A-New-Choice-for-10GbE-Top-of-Rack-Data-Center-Switching/ba-p/156932
