Allied Telesis XEMs offer a high degree of flexibility that future-proofs your network investment against changes in network infrastructure, topologies, and physical link requirements. XEM expansion modules can be used in a variety of configurations to provide tailored solutions that meet wide-ranging physical networking requirements. Whatever your network needs, Allied Telesis has a XEM that is right for the job. Achieve expandability with the selection of copper gigabit XEMs to easily add maximum Gigabit Ethernet port density to your network. Enjoy flexibility with the fibre gigabit XEMs that let you aggregate both copper and fiber links. Network scalability is simple with the AT-XEM-STK. Use this high speed stacking XEM to create a single 'virtual chassis' from multiple x900 switches, increasing resiliency and port density without increasing management complexity. Achieve high performance with the extensive range of 10 Gigabit Ethernet XEMs. With true ten Gigabits per second throughput, these XEMs provide high-speed, high-capacity copper or fiber uplinks, up to 20Gbps of non-blocking throughput per XEM.