Adtran 4110 Manual De Usuario

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Express 4110/4120 User Manual

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Chapter 1

Understanding ISDN and the 

Express 4110/4120

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 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.