Nortel AL2018013-E6 5500-SSC Stacking Cable (10 feet).For the Ethernet Routing Switch 5510-48T, 5510-24T, 5520-48T-PWR, 5520-24T-PWR, and 5530-24TFD only.(EUED RoHS 6/6 compliant) Product description Avaya 5500-SSC - Stacking Cable - 3m Type Stacking cables length 3 m Developed for Ethernet routing switch 5510-24T;BayStack 5510-48T