The Cisco 1-Port OC-48c/STM-16 ATM SPA, in conjunction with other SPAs implementing various types of network technologies, allows users to flexibly build cost-effective routing solutions that focus on point-of-presence (POP) and service provider core applications targeted for all telcos and Internet service providers (ISPs), for worldwide use. This SPA includes a comprehensive ATM feature set, including per-virtual circuit and per-virtual path traffic shaping; ATM service classes, including constant bit rate (CBR), non-real time variable bit rate (VBR-nrt), real-time variable bit rate (VBR-rt), unspecified bit rate (UBR), Layer 3 QoS, a high-performance segmentation-and-reassembly (SAR) architecture, and support for a large number of ATM virtual connections. All these features are based on industry specifications and standards.The Cisco 1-Port OC-48c/STM-16 ATM SPA along with other ATM SPAs address the growing demand for improved ATM QoS features, combined with the advanced Layer 3 class-of-service (CoS) capabilities provided by various Cisco routers. Users now can provide robust QoS mechanisms for prioritization of traffic from traditional and high-speed LANs over an ATM network.