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Duet
Basic & Primary Rate ISDN Tester - User Guide
1 - 8 428856
Equipment
There are two main types of ISDN equipment:
• Terminal equipment (TE)
• Network terminator (NT)
Terminal Equipment
This refers to end-user devices such as analog or digital
telephones, X.25 data terminal equipment, ISDN
workstations, or integrated voice/data terminals (IVDT).
Terminal equipment can be classified by two types:
• TE1—this uses and supports ISDN protocols and
services.
• TE2—this comprises non-ISDN compatible devices
such as analog telephones, personal computers and
printers. In these cases a terminal adaptor (TA) is
used to allow a non-ISDN device access to the ISDN
network.
Network Terminators
Network terminators (NTs) can be classified by two main
types:
• NT1 equipment terminates the physical connection
between a customer site and the Local Exchange
(LE) or Central Office (CO). The NT1 equipment is
actually on the customer site, at the ‘U’ interface
point.
• NT2 equipment provides customer site switching,
multiplexing and concentration. NT2 equipment
may be Private Automatic Branch Exchanges
(PABXs), Local Area Networks (LANs), mainframe
computers, terminal controllers, and other digital
voice/data switching equipment.