Your affordable link to the ISDN network.
Your affordable link to the ISDN network.
NTU-1 (Network Termination Unit-1)
© 2007. All rights reserved. Black Box Corporation.
FREE 24-hour Tech Support: 724-746-5500
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FEATURES
• Point-to-point or point-to-multipoint
configuration.
• Up to 18,000 feet (5500 meters)
operating distance.
• Easy configuration—everything you
need is on the rear panel.
• Uses standard RJ-45 jacks on all
interfaces.
• Operates automatically.
• For wallmount or desktop use.
• Power supply is included.
The NTU-1 in typical applications.
OVERVIEW
ISDN service requires an NT1 to connect the terminal
adapter to the ISDN line. If your terminal adapter doesn’t
have a built-in NT1, the NTU-1 is your affordable choice.
The NTU-1 converts the 2-wire echo-canceled 2B1Q code
from the central office to a Customer Premise 4-wire alternate
space inversion code. It supports both point-to-point and
point-to-multipoint configuration. All options and connections are accessible on the rear panel, and the NTU-1 comes
with surge protection. Also, all interfaces have standard RJ-45
jacks.
Power Information:
Wallmount Transformer—
The NTU-1 is normally powered from the wallmount
transformer . The transformer and the NTU-1 power-supply
circuitry provide 5 watts for up to two terminal devices
connected to the S/T interface. Connect the transformer’s
barrel connector to the Power jack on the rear panel. Plug
the transformer into a standard 120-VAC wall socket.
Signal Power—
The NTU-1 routes local and remote power to the signal
leads of the S or T interface. For phantom powering
applications, S/T interface connector pins 4 and 5 (Transmit)
are the negative power leads, and pins 3 and 6 (Receive) are
the positive power leads.
Remote Power—
The NTU-1 can receive backup power over the U interface
connector . The input must be a minimum of 48 VDC and
5 watts. Both local and backup power is routed to the S/T
interface connectors to power the associated terminal
equipment. Pins 7 and 8 on the U interface provide remote
power to both S/T jacks and the NTU-1.
S/T Interface
(100 ohms IN)
Multipoint S/T
Interface
(100 ohms IN)
Multipoint
S/T Interface
ISDN U Interface
from Telco
(100 ohms IN)
ISDN U Interface
from Telco
(100 ohms IN)
ISDN U Interface
from Telco
(100 ohms IN)
TE
TE
TE
TE
TE
NTU-1
(IS200A-R2)
NTU-1
(IS200A-R2)
NTU-1
(IS200A-R2)
100 ohms IN on either one of the units,
and OUT on the other
100 ohms IN on unit with
longest cable
100 ohms IN on unit with
longest cable
Up to 1 km
Up to 1 km
Passive Bus
Connection
Point-to-point
connection
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TECH SPECS
Line T ype —Basic Rate ISDN (2B1Q)
Switch Compatibility — AT&T
®
, Northern Telecom®, Siemens®, GTE
®
Maximum Operating Distance —
U interface: 18,000 feet (5500 meters);
S/T interface: 3280 feet (1000 meters)
Operation — Full or half-duplex
Operating Mode — Point-to-point or multipoint
Indicators — (6) LEDs: Local Power (LP), Remote Power (RB), Remote Power
Reversed (RPR), Loopback (LB), Sealing Current (SC), Activity (ACT)
Connectors — (3) RJ-45 (2 for the S/T interface, 1 for the U interface)
Diagnostics — None
T emperatur e —Operating: 32 to 122°F (0 to 50°C);
Storage: -40 to +176°F (-40 to +80°C)
Humidity T olerance —10 to 95%, noncondensing
Power — 120 VAC, 60 Hz, 5 watts maximum, external supply
Size — 1.4"H x 6.3"W x 3.8"D (3.6 x 16 x 9.7 cm)
Weight — 0.6 lb. (0.3 kg)
Item Code
NTU-1 (Network Termination Unit-1) IS200A-R2
Light-emitting diodes (LEDs) display the status of certain
operating functions and will indicate if malfunctions are
occurring.
Keep these guidelines in mind when observing the NTU-1’s
LEDs:
• If a disruption occurs between the U interface and the
ISDN switch, the ACT LED flickers.
• If a disruption occurs between the S or T interface and the
TE, the ACT LED blinks once per second.
• If a disconnect occurs on both interfaces, the ACT LED goes
out.
The NTU-1’s six LEDs are:
LP (Local Power)—ON indicates the wallmount
transformer is plugged in, and 120 VAC is present.
RB (Remote Power)—ON indicates the remote power
source is connected and functional.
RPR (Remote Power Reversed)—ON indicates the remote
power source is connected, but polarity is reversed. This
must be corrected by site facilities.
LB (Loopback)—ON indicates that the telephone
company’s ISDN switch has sent a 2B+D loopback command
to the NTU-1.
SC (Sealing Current)—ON indicates a presence of metallic
termination test voltage from the ISDN switch.
ACT (Activity)—ON indicates that a link-up between
the TE and ISDN Central Office via the NTU-1 has been
achieved, and transmission can take place.
Technically Speaking
Recognize any of these situations?
• You wait more than 30 minutes to get through
to a vendor’s tech support.
• The so-called “tech” can’t help you or gives you
the wrong answer.
• You don’t have a purchase order number and the
tech refuses to help you.
• It’s 9 p. m. and you need help, but your vendor’s
tech support line is closed.
According to a survey by Data Communications
magazine, 90% of network managers surveyed say
that getting the technical support they need is extremely
important when choosing a vendor . But even though
network managers pay anywhere from 10 to 20% of their
overall purchase price for a basic service and support
contract, the technical support and service they receive falls
far short of their expectations—and certainly isn’t worth
what they paid.
At Black Box, we guarantee the best value and the
best support. You can even consult our Technical Support
Experts before you buy if you need help selecting just
the right component for your application.
Don’t waste time and money—call Black Box today.
Why Buy From Black Box? Exceptional Value.
Exceptional Tech Support. Period.
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