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CLI-based Configuration Guide - Interface Management

AR100, AR120, AR160, AR1200, AR2200, AR3200, and AR3600 V300R003

This document provides the basic concepts, configuration procedures, and configuration examples of the interfaces supported by the device.
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Overview of POS Interfaces

Overview of POS Interfaces

A POS interface uses SONET/SDH as the physical-layer protocol and provides a high-speed, reliable, and P2P IP data transfer.

Introduction to POS

Figure 14-1  Typical POS application diagram

A POS interface uses SONET/SDH to transfer IP data in MAN and WAN. The POS uses the link-layer protocol (FR, PPP and HDLC) to encapsulate IP packets, uses the service adapter at the SONET/SDH channel layer to map the packets to the payload of SONET/SDH signals, then uses the SONET/SDH transport layer and section layer to add a path overhead and segment overhead and encapsulate the payload in a SONET/SDH frame, and finally transmits it on the optical network.

The device provides POS interfaces with two rates and their signal level are OC-3/STM-1 (155 Mbit/s) and OC-12/STM-4 (622 Mbit/s).

SONET and SDH Overview

Synchronous optical network (SONET) is a standard defined by ANSI and is mainly used in North America and Japan. All clocks in the entire network come from a main clock. SONET defines a rate hierarchy for optical transmission devices. It transmits data at a base rate of 51.84 Mbit/s.
  • In electrical signal, the base rate is called level-1 Synchronous Transport Signal (STS-1).
  • In optical signal, the base rate is called level-1 Optical Carrier (OC-1).

ITU-T, based on SONET, develops a worldwide standard synchronous digital hierarchy (SDH), which is mainly used in Europe.

The basic rate of SDH is 155.52 Mbit/s, which is called STM-1. This rate equals the OC-3 rate in SONET.

Updated: 2019-03-06

Document ID: EDOC1100069331

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