ZyXEL Communications IES-1248-51A, User Manual

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IES-1248-51V User’s Guide
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H A P T E R
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).