Packet over SONET Operation and Specifications > Packet over SONET | Cisco Press
Ethernet Card Software Feature and Configuration Guide for the Cisco ONS 15454, Cisco ONS 15454 SDH, and Cisco ONS 15327, Release 7.2 - Chapter 20, POS on ONS Ethernet Cards [Cisco ONS 15454 Series Multiservice Provisioning Platforms] - Cisco