Contents

Overview·· 1

Key features· 1

Encapsulation types· 1

ATM OAM·· 1

QoS· 1

Specifications· 1

Front panel 2

Technical specifications· 2

LEDs· 3

Environment requirements· 3

Overview

The following ATM subcards are available for the CR16000-F routers.

Table 1 ATM subcards available for the CR16000-F routers

Key features

Encapsulation types

The ATM interfaces support SNAP encapsulation and support the configuration of scrambling, frame format, and path trace bytes. The ATM interfaces are well compatible with devices of other mainstream manufacturers.

At ATM adaptation layer 5 (AAL5), the ATM interfaces support 2684R and 2684B encapsulation.

The ATM interfaces support the IP over ATM (IPoA). IPoA enables ATM to carry IP packets. In an IPoA implementation, ATM provides the data link layer for IP hosts in the same network. To enable IP hosts to communicate with one another over an ATM network, the IP packets they send need to be processed accordingly. IPoA makes full use of the advantage of ATM. It provides high-speed point-to-point connections and improves the bandwidth of the IP network. It also provides excellent network performance and perfect QoS services.

ATM OAM

OAM provides a way to detect and locate problems and to monitor network performance without interrupting the current services. By inserting OAM cells, which are constructed in the standard ATM cell format, in cell streams, you can obtain specific information about the entire network.

OAM is implemented on an ATM connection as follows:

1.     Each side of the connection periodically sends OAM cells to its peer.

2.     After receiving an OAM cell, the recipient returns the OAM cell to the sender.

3.     Each side examines the received OAM cells to see if the OAM cells are those previously sent by itself.

An ATM connection is considered normal if the round trip time of an ATM OAM cell is within a specific period. If a specific number of successive ATM OAM cells do not return within the period, the ATM connection is considered faulty.

QoS

The ATM subcards support PVC bandwidth control. Each PVC supports scheduling of eight queues.

Specifications

The figures in this section are for illustration only.

Figure 1 PIC-ALP4L

Front panel

Figure 2 MIC-SP4L front panel

Technical specifications

LEDs

Table 2 POS/ATM port status LED description

Environment requirements

Make sure the ambient environment meets the following requirements:

·     Temperature and humidity requirements

Table 3 Temperature and humidity requirements

·     Dust protection requirements

Table 4 Dust concentration limits in the equipment room

·     Corrosive gas protection requirements

Table 5 Corrosive gas concentration limits in the equipment room