R3303-HP HSR6800 Routers Interface Configuration Guide

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Configuring POS interfaces
Overview
SONET
Synchronous Optical Network (SONET), a synchronous transmission system defined by the ANSI, is an
international standard transmission protocol. It adopts optical transmission.
SDH
Synchronous Digital Hierarchy (SDH), defined by the CCITT (today’s ITU-T), uses a SONET rate subset.
SDH adopts synchronous multiplexing and allows for 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 investment in devices.
POS
Packet over SONET/SDH (POS) is a technology widely used on WAN and MAN. It supports data
packets, such as IP packets.
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 on your device support PPP, Frame Relay, and HDLC at the data link layer and IP at
the network layer. Depending on your device model, the transmission rate of POS interfaces can be
STM-1, STM-4, and STM-16, each four times the immediate lower level.
Configuring a POS interface
Before you configure the link layer and network layer protocols on a POS interface, you must configure
its physical parameters. In addition, to have the interface participate in backup, configure the interface
backup parameters; to set up firewall on the interface, configure packet filtering rules.
Configuration procedure
To configure a POS interface:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter POS interface view.
interface pos interface-number N/A