The main features of the Cisco 8-Port OC-12/STM-4 Channelized/Unchannelized ATM Switch Service Module are listed here.
Full nonblocking, full-duplex line-rate throughput on all 8 ports when used on the Cisco MGX 8950 chassis
Up to 4 ports with nonblocking, full-duplex line-rate throughput when used on the Cisco MGX 8800 chassis
Individual port channelization down to DS-3 and OC-3c/STM-1
Per-virtual-path and per-virtual-circuit traffic shaping and available bit rate (ABR) with virtual source and virtual destination
APS (1:1 and 1+1) port redundancy, plus APS 1+1 card redundancy
Up to 4 million cell buffers
Up to 16 classes of service (CoS) that can be used to support IP or ATM services
Support for standards-based Private Network-to-Network Interface (PNNI), switched virtual circuit (SVC) and switched virtual path (SVP),
soft permanent virtual connection (SPVC) and soft permanent virtual path (SPVP), and Multiprotocol Label Switching (MPLS) services