The Cisco ASR 1000 Series SIP helps enable high-performance, intelligent wide- and metropolitan-area network (WAN and MAN) services. Enterprises and service providers can take full advantage of the scalability and performance it offers, along with many options for WAN aggregation and connectivity that the SPA portfolio offers. The Cisco ASR 1000 Series SIP provides the physical termination for the SPAs and accepts up to four half-height and 2 full height Cisco SPAs, supporting Ethernet, ATM, Packet over SONET/SDH (PoS), and Serial interfaces.