The Cisco BPX 8600 Series wide-area switches are standards based high-capacity broadband ATM switches that provide backbone ATM switching, IP + ATM services including Multiprotocol Label Switching (MPLS) and deliver a wide range of other user services.The BPX 8620 switch is a scalable, standards-compliant unit. Using a multi-shelf architecture, the BPX switch supports both narrowband and broadband user services. The modular, multi-shelf architecture enables users to incrementally expand the capacity of the system as needed. The BPX switch consists of the BPX shelf with fifteen card slots, which may be co-located with the MGX 8220 and Extended Services Processor (ESP), as required.