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Egate-100 Ver. 4.0 Overview 1-1

Chapter 1

Introduction

1.1 Overview

Egate-100 is a Gigabit Ethernet over TDM aggregation gateway that combines

Ethernet traffic carried over PDH (E1/T1) into a Gigabit Ethernet MAN

(Metropolitan Area Network). Egate-100 can aggregate up to 126 remote LANs

over fractional E1/T1 or up to 42 links using standard bonding protocols.

The unit features next-generation Ethernet over PDH encapsulation and bonding

capabilities with support for standard protocols such as generic framing

procedure (GFP), virtual concatenation (VCAT), and link capacity adjustment

scheme (LCAS). The GFP, VCAT, and LCAS protocols allow service providers to

dynamically allocate bandwidth to their customers. By incorporating these

enhanced capabilities, Egate-100 enables higher user throughput, and offers the

following benefits:

• Allows users to fully utilize their contracted bandwidth by ensuring low and

constant traffic overhead

• Minimizes service disruptions in cases of link failures via hitless traffic

restoration

• Enables high service resiliency for real-time applications by dramatically

reducing delays on the TDM connections

• Ensures robust traffic delivery with automatic error correction and minimal

packet retransmissions

• Enhances Ethernet over NG-PDH capabilities by supporting multiple NTUs in

up to 42 remote locations.

Full Layer 2 switching (bridge) between the Ethernet segments beyond the SDH

and Gigabit Ethernet networks is provisioned. The bridge supports VLAN-aware

and VLAN-unaware bridging modes, and can be used for VLAN-based Layer 2

VPNs.

Egate-100 also supports flow classification and policing for network ingress

traffic. Classification is supported per port that enables packet identifiers such as

VID, p-bit, DSCP and IP-precedence.

The unit includes two electrical or optical Gigabit Ethernet ports and, depending

on the interface option ordered, either a dual port to the SDH/SONET network or

three channelized T3 ports. The Gigabit Ethernet ports support link aggregation

according to IEEE 802.3ad requirements. The dual SDH/SONET ports support

unidirectional APS or 1+1 optimized bidirectional mode, as per ITU G.841 Annex B.

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RAD Data comm 100 Especificaciones Pagina 33