High Quality Content by WIKIPEDIA articles! Ethernet Routing Switch 5600 system or (ERS-5600) in computer networking terms are stackable routers and switches designed and manufactured by Avaya. The ERS-5600 switches can be stacked up to 8 units high to create a 1.152 Tbit/s backplane through a FAST Stacking configuration. The 5600 series consists of five stackable models that can be mixed and matched together with other ERS5600 models or other ERS-5500 models to meet configuration requirements.