Adtran Express L768 Manual de usuario descargar pdf (Pagina 34)

Chapter 2. Installation

2-2 Express L768 User Manual 61203192L1-20

SDSL Overview

A new technology has been developed for the telcos for delivery of T1

service. The technology is known as high-bit-rate digital subscriber

line (HDSL). HDSL employs a 2B1Q modulation technique across the

same types of pairs traditionally encountered with metallic T1 deliv-

ery systems. HDSL satisfies the telco distance requirements without

the use of repeaters.

Symmetric Digital Subscriber Loop (SDSL) is HDSL using only one

pair. This provides a maximum of 768 kbits/sec, which is half the rate

of HDSL.

LOCAL AREA NETWORK CONNECTION

The Express L768 has a 10BaseT connector that provides half-duplex

10 Mbps operation over a four-wire twisted pair. Place the switch in

the TO HUB position when connecting to a 10BaseT concentrator or

Hub. Place the switch in the TO NIC position when connecting direct-

ly to a computer’s 10BaseT network interface card.

Other types of ethernet interfaces (i.e., AUI, 10Base2, etc.) can be ac-

commodated by obtaining an appropriate converter.

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Adtran Express L768 Manual de usuario Pagina 34