R2511-HP MSR Router Series Interface Configuration Guide(V5)

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Configuring POS interfaces
This chapter describes how to configure physical parameters for POS interfaces. You must perform the
tasks in this chapter before you configure other settings on the interface, including the link and network
layer parameters, interface backup, and packet filtering.
Feature and hardware compatibility
Feature MSR900 MSR93X MSR20-1X MSR20 MSR30 MSR50
MSR10
00
POS interface No No No No Yes Yes No
Overview
SONET and SDH
Synchronous Optical Network (SONET), a synchronous transmission system defined by the ANSI, is an
international standard transmission protocol. It adopts optical transmission.
ITU-T Synchronous Digital Hierarchy (SDH) 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 physical parameters on 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