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NT1 ACE

ISDN Network Termination

Product Features

■ 

Compatible with 2B1Q

basic rate services and
standard ISDN terminals

■ 

Provides 2B+D basic 

rate service

■ 

Conforms to ANSI T1.601-

1992 and ANSI
T1.605-1991

■ 

Supports multiple switch

vendors Lucent 5ESS, NTI
DMS-100, Siemens EWSD,
NEC, and National ISDN-1

Responds to Quiet Mode

and Insertion Loss Test

Provides automatic 

overcurrent protection 
for S/T power

Selectable terminating

impedance; 50 Ohm, 
100 Ohm, or unterminated

Provides U-interface 

lightning protection

Standard five-year

warranty

The ADTRAN

®

NT1 ACE

provides the

network termination for 2B1Q ISDN basic
rate service.

The NT1 ACE provides a 2B+D

basic rate interface between the subscriber’s
terminal equipment and the ISDN network.
Basic rate ISDN consists of two 64 kbps B
channels and a single 16 kbps D channel.
Connection to the ISDN network is made 
with a U interface. Connection to the
subscriber’s terminal equipment is by an 
S/T interface. The U and the S/T interfaces
conform to ANSI and CCITT standards and
perform all Layer 1 functions.

The NT1 ACE is designed with aesthetics as

well as functionality in mind. The unit is
enclosed in an attractive, durable plastic
housing appropriate for desk-top use. The NT1
ACE is powered by the wall-mount power
supply included with the unit. The wall-mount
power supply provides up to 8.9 W of power for
terminal equipment. The NT1 ACE monitors

the S/T interface for overcurrent fault condi-
tions. In the event of such a condition, the unit
automatically limits the amount of delivered
current until the fault condition is removed. 

As many as eight passive bus devices may be

connected to the S/T interface of the NT1.
These connections can be in one of the
following two modes: multiple terminals within
50 meters of each other over the full 1,500
meter range of the interface, or multiple termi-
nals of arbitrary spacing within 200 meters.
Also, termination impedance options include
50 Ohm, 100 Ohm, or unterminated. The NT1
ACE is protected from lightning and harmful
line transients on the network interface.

Three LED status indicators on the NT1

ACE aid in fault isolation. Indicators display
the status for Power, Network Ready, Network
and Customer Errors.

READY

ERROR

POWER

NT1 ACE

ISDN

Switch

ISDN Phone

U-Interface

Local Loop

S/T

BUS

Customer Premises

Telephone

Company Office

NT1 ACE

Video-
Conference
Equipment

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