ZyXEL Communications IES-1248-51 Guia do Utilizador descarregar pdf (Página 35)

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IES-1248-51V User’s Guide

CHAPTER 1

Introducing the IES-1248-51V

1.1 Overview

The IES-1248-51V is an IP-based DSLAM (Internet Protocol Digital Subscriber Line

Access Multiplexer) that connects ADSL and voice subscribers to the Internet. As a

high-performance but yet compact platform, it can conveniently deliver broadband

Internet access and VoIP telephony service (over existing POTS telephone wiring)

to multi-tenant units (MTUs), hospitals, hotels, schools, university campuses and

ISPs. The IES-1248-51V’s low cost and easy management make it a perfect DSL-

provider solution.

The IES-1248-51V platform allows for convenient management and support of

ADSL technology. Up to 48 ADSL subscribers can simultaneously utilize a wide

range of powerful broadband services.

The IES-1248-51V can also act as an Optical Network Unit (ONU) which supports

a fiber connection to the building (FTTB). Install a GEPON SPF ONU transceiver in

an SPF slot and then connect the transceiver to a fiber connection. The distance

between the IES-1248-51V and an Optical Line Terminal (OLT) can be up to 20

kilometers. See Section 1.5 on page 45 for more information about PON.

1.1.1 Voice Features

The IES-1248-51V provides 48 aggregated lines of POTS connectivity, designed to

connect the subscriber with the Public Switched Telephone Network (PSTN)

through service provider’s softswitch or Media Gateway Access Controller (MGAC).

Each telephone line interface is a Foreign Exchange Subscriber (FXS) port

connecting to the subscriber's telephone via copper wire. The analog voice signal

from the subscriber is converted to voice data packets and transmitted towards

the callee across the IP packet-switched network.

The IES-1248-51V uses H.248 for network signaling to establish or tear down a

voice call. Dual-Tone Multi-Frequency (DTMF) signals are also translated into

H.248 signals (or transmitted in the voice band).

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