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61200176L3-1 Express 4110/4120 User Manual 1-1
Chapter 1 Understanding ISDN and the
Express 4110/4120
ISDN OVERVIEW
The Integrated Services Digital Network (ISDN) is a public or private
switched digital network. ISDN is an international standard for digital
communications, 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 ser-
vices and modernizing communication networks for information move-
ment and management efficiency.
THE EXPRESS 4110/4120
The Express 4110/4120 is a standalone device that links two Local Area
Networks (LANs) using a high-speed ISDN public network or leased
two-wire line. It also contains two plain old telephone service (POTS)
connectors used for voice/modem applications
Figure 1-1 on page 1-2 and Figure 1-2 on page 1-2 show the Express
4110/4120. The 10BaseT connector operates at 10 megabits per second
half duplex and accepts standard Ethernet packets encapsulated using
IEEE 802.3 or Ethernet II (DIX). The maintenance port can connect to any
asynchronous terminal emulating a VT 100 terminal for configuration.