Configuring Pos Interfaces; Overview; Sonet And Sdh; Pos - H3C SR6600 Configuration Manual

Configuring POS interfaces

This chapter describes how to configure physical parameters for POS interfaces, including standard
POS interfaces, POS subinterfaces, 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 number 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 on the device support PPP, Frame Relay, 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.

Configuring a standard POS interface

Step
1. Enter system view.
2. Configure the packet
statistics collection interval.
3. Enter standard POS
interface view.
4. (Optional.) Configure the
interface description.
5. Set the keepalive interval.
Command
system-view
flow-interval interval
interface pos interface-number
description text
timer-hold seconds
28
Remarks
N/A
By default, the packet statistics
collection interval is 300 seconds
for an interface.
N/A
By default, the description of a
POS interface is interface name
Interface, for example, Pos2/1/1
Interface.
The default setting is 10 seconds.