ADTRAN DS3 NIU3 Manual page 2

OPTIONS
Aside from power source and ground terminations, there are no option selections associated with the
NIU3 standalone housing.
TURN-UP
When power is applied, the NIU3 STATUS LED turns ON red while the unit performs a self test during
which the other LEDs go through an ON/OFF sequence. If the test passes, the STATUS LED turns ON
green indicating the NIU3 is online. If the test fails, the STATUS LED remains red and the host circuit
board bypass relays (patent pending) maintain data flow around the NIU3.
OPERATION
The NIU3 standalone host circuit board exchanges data to and from the network loop and customer
loop via the BNC connectors. During operation the NIU3 is transparent to data flow. If the NIU3 fails
or is removed from the circuit, relays on the standalone host circuit board provide passthrough
transmission so data flow can resume.
In the event of circuit trouble, test equipment at the central office can monitor the loop. When a
loopback is initiated, the transmit/receive paths can be tested to the customer interface. NIU3
troubleshooting tests are intrusive to data transmission.
LED Indication
There are no LEDs on the standalone housing. However, NIU3 LEDs provide indication for NIU3 and
standalone housing configuration and status.
MAINTENANCE
The NIU3 standalone housing does not require maintenance for normal operation.
COMPLIANCE
NEBS Level 3
ANSI T1.404
UL 1950
DS3 NIU3
STANDALONE HOUSING
UL 1950 Configuration Codes:
Code
Power Code (PC)
Telecommunication Code (TC)
Installation Code (IC)
NOTE: Use one of the following requirements for powering the unit locally:
a) Connect to a grounded –48 VDC source, electrically isolated from the AC source. Provide branch
circuit overcurrent protection with a fuse or circuit breaker, minimum 48 VDC, maximum 15 A.
Provide an easily accessed approved and rated disconnect device in the field wiring.
b) Connect to an approved Class 2 Type (LPS) power supply rated 48 VDC, maximum 240 VA.
CAUTION: Per GR-1089-CORE, October 2002, Section 9, this system is designed and intended for
installation in a DC-C (common) bonding and grounding system only. It is not intend-
ed or designed for installation in a DC-I (isolated) bonding and grounding system.
PART NUMBERS & CLEI CODES
Standalone Housing:
NIU3:
AC/DC Transformer:
CLEI, NIU3:
CLEI, S/A Housing:
WARRANTY
ADTRAN will replace or repair this product within the warranty period if it does not meet its
published specifications or fails while in service. Warranty information can be found at
www.adtran.com/warranty. U.S. and Canada customer Faxback: 877-457-5007, Document 414.
PRICING AND AVAILABILITY 800.827.0807
TECHNICAL SUPPORT 800.726.8663
RETURN FOR REPAIR 256.963.8722
Input Output
F C
– –
E –
1212070L2
1212075L2
1212074L1 (separately purchased)
NCD3EG0A _ _
NCM57WVD _ _
www.adtran.com
61212070L2-22A