Packet-over-SONET/SDH (POS) enables core routers to send native IP packets directly over SONET/SDH frames. POS provides lower packet overhead and lower cost per megabit than any other data transport method. These efficiencies, along with the increasing evolution of the optical network, enable POS to effectively support increases in IP traffic over existing and new fiber networks. POS is a SONET/SDH-compliant interface that supports SONET/SDH level alarm processing, performance monitoring, synchronization, and protection switching.

Packet Over SONET/SDH Resources

	Cisco's Packet over SONET/SDH Technology Support This paper contains information about benefits provisioning, support, and more.
	Packet-over-SONET/SDH This paper discusses the emergence of SONET/SDH and optical fiber as significant technologies for building large-scale, high-speed, IP-based networks.

Optical Products Supporting Packet over SONET/SDH
To find out more about the Cisco optical and optically-enabled products that support POS, click on these links:

	Cisco ONS 15190 IP Transport Concentrator
	Cisco 12000 series Internet router