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61200.070L1-1 Express XL/XLT User Manual 7

Chapter 1

Understanding ISDN and

the Express XL/XLT

ISDN OVERVIEW

The Integrated Services Digital Network (ISDN) is a public or private switched

digital network. ISDN is an international standard for digital communica-

tions, allowing a full range of enhanced services supporting voice, data, and

image applications through standard interfaces over a single telephone wire.

ISDN provides a means of integrating these services and modernizing com-

munication networks for information movement and management efficiency.

THE EXPRESS XL/XLT

The Express XL/XLT is a standalone device that links two Local Area Net-

works (LANs) using a high-speed ISDN public network or leased two-wire

line. Optionally, the Express XLT has a plain old telephone service (POTS)

connector that is used for voice/modem applications

See Figure 1-1 for an illustration of the Express XL/XLT. The 10BaseT connec-

tor operates at 10 megabits per second half duplex and accepts standard eth-

ernet packets encapsulated using IEEE 802.3 or Ethernet II (DIX). Because the

10BaseT is a four-wire interface, a crossover switch permits the user to connect

to either a hub-concentrator or network interface card without the need for

special cabling. The maintenance port can connect to any asynchronous termi-

nal emulating a VT 100 terminal for configuration.

Figure 1-1

Express XL/XLT

COL

JAB

ERR

LNK

TEST

Express XL

LOOP

PWR

SELECT

TEST

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Adtran 1200070L1 Manual de usuario Pagina 23