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61212075L1-5C Section 61212075L1-5, Issue 3 1
DS3 Network Interface Unit
NIU3
Installation and Maintenance
Section 61212075L1-5C
Issue 3, October 2001
CLEI Code NCD3EEDA_ _
CONTENTS
1. GENERAL.......................................................... 1
2. INSTALLATION ............................................... 2
3. TURNUP ............................................................ 4
4. OPERATION...................................................... 4
5. TESTING............................................................ 5
6. MAINTENANCE ............................................... 5
7. SPECIFICATIONS ............................................ 5
8. WARRANTY AND CUSTOMER SERVICE ... 5
FIGURES
1. NIU3 .................................................................. 1
2. DS3 NIU Loopback Diagram ............................. 2
3. Standalone Power Connection............................ 3
4. AC/DC Transformer Power Connection ............ 3
5. Shelf Power Connection ..................................... 3
TABLES
1. LED Indication ................................................... 4
2. NIU3 Specifications ........................................... 6
Figure 1. NIU3
Trademarks: Any brand names and product names included in this document are
trademarks, registered trademarks, or trade names of their respective holders.
1. GENERAL
This I&M Practice is used in association with the
Standalone Housing, 12-Slot Shelf, or 3-Slot Shelf.
Refer to Specifications for part numbers.
The ADTRAN DS3 Network Interface Unit (NIU3)
resides at the customer location as a demarcation and
loopback point for DS3 circuits. When used in a DS3
circuit, the unit provides a troubleshooting advantage
by supplying information that will eliminate a
customer premises dispatch. The unit performs a
loopback at the customer interface toward the network
when initiated either remotely from the CO, or locally
from the unit’s front panel pushbutton. The NIU3 is
transparent to data transmission during normal
operation. Figure 1 shows the NIU3, P/N
1212075L1.
Revision History
This document has been reissued to incorporate
administrative revisions.
Features
The NIU3 provides the following features and
functions:
• Standalone enclosure, 12-slot, or 3-slot shelf
installation.
• DS3 C-bit and M13 framing or unframed.
• Bypass relays on the host circuit board ensure
virtually uninterrupted data transmission during
card failure, removal, or power loss.
• Loopback in response to FEAC codes.
• Recessed front panel pushbutton loopback
control.
• Nonintrusive front panel monitor jacks for both
network and customer directions.
• Notification on loss of signal detection.
• 120-minute loopback time out.
• -48 VDC power for standalone or shelf
enclosures.
• 120 VAC adapter option for standalone.
• Dual power feeds in shelf configuration.
PWR
NTWK
CUST
LBK
LBK
SEL
NTWK MON
1212075
CUST MON