Configuring POS interfaces
This chapter describes how to configure physical parameters for POS interfaces, including standard POS
interfaces and POS channel interfaces.
Before you configure the link and network layer parameters on a POS interface, you must perform the
tasks in this chapter to configure its physical parameters.
Overview
Packet over SONET/SDH (POS) is a technology widely used on WAN and MAN. It supports data
packets such as IP packets.
SONET and SDH
Synchronous Optical Network (SONET) adopts optical transmission. It is a synchronous transmission
system defined by the ANSI and is an international standard transmission protocol.
ITU-T Synchronous Digital Hierarchy (SDH) uses a SONET rate subset. SDH adopts synchronous
multiplexing and a flexible mapping structure. It can add or drop low-speed tributary signals to or from
SDH signals without a large amount of multiplexing/demultiplexing devices. This reduces signal
attenuation and decreases device investments.
POS
POS maps length-variable packets directly to SONET synchronous payloads and uses the SONET
physical layer transmission standard. It offers high-speed, reliable, and point-to-point data connectivity.
The POS interfaces support PPP and HDLC at the data link layer and IP at the network layer. Depending
on the device model, the transmission rate of POS interfaces can be STM-1, STM-4, and STM-16. The rate
of a level is four times the nearest lower level.
Feature and hardware compatibility
Hardware POS interface
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