Chapter 20 Pos On Ons Ethernet Cards; Pos Overview - Cisco ONS 15454 SDH Configuration Manual

POS on ONS Ethernet Cards
This chapter describes packet-over-SONET/SDH (POS) and its implementation on ONS Ethernet cards.
This chapter contains the following major sections:
•
•
•
•
•
•

POS Overview

Unlike Asynchronous Transfer Mode (ATM) and Frame Relay, Ethernet was not originally designed for
interfacing with SONET/SDH. Ethernet data packets need to be framed and encapsulated into a
SONET/SDH frame for transport across the SONET/SDH network. This framing and encapsulation
process is known as POS.
POS Overview, page 20-1
POS Interoperability, page 20-2
POS Encapsulation Types, page 20-4
POS Framing Modes, page 20-7
POS Characteristics of Specific ONS Ethernet Cards, page 20-7
Ethernet Clocking Versus SONET/SDH Clocking, page 20-10
Cisco ONS 15454 and Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide, R8.0
20
C H A P T E R
20-1