Black Box NTU-1 manual 3 of, Tech Specs, Recognize any of these situations?, Technically Speaking

Technically Speaking

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.

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

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9/19/2007	724-746-5500	blackbox.com
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