Black Box NTU-1 - Manual (Page 3)

3 of 3 9/19/2007
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TECH SPECS
Line Type — 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
Temperature — Operating: 32 to 122°F (0 to 50°C);
Storage: -40 to +176°F (-40 to +80°C)
Humidity Tolerance — 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.