ADTRAN DS3 NIU3 Installation And Maintenance Practice

CONTENTS
1. General .................................................................... 1
2. Description .............................................................. 1
3. Installation............................................................... 2
4. Wiring...................................................................... 2
5. Turnup ..................................................................... 4
6. Operation................................................................. 4
7. Maintenance ............................................................ 4
8. Specifications .......................................................... 5
9. Warranty and Customer Service ............................. 6
FIGURES
Figure 1. DS3 NIU3 3-Slot Shelf ..................................... 1
Figure 2. NIU3 Circuit Diagram....................................... 3
Figure 3. NIU3 3-Slot Shelf Rear Panel ........................... 3
Figure 4. Local DC Power Connection ............................ 3
Figure 5. Power Supply/Rectifier Connection.................. 4
TABLES
Table 1. Compliance Codes ............................................ 1
Table 2. DS3 NIU3 3-Slot Shelf Specifications.............. 5

1. GENERAL

This practice is used in association with the NIU3
circuit card practice, P/N 61213075L2-5.
The ADTRAN ® NIU3 3-Slot Shelf (P/N 1212073L1)
installs in a standard 19-inch bay (23-inch mounting
flanges also included) at a designated location conve-
nient to the customer.
Revision History
Issue 4 of this document provides the inclusion of a
cautionary statement concerning the bypass relays in
the Installation section on page 2.

2. DESCRIPTION

The NIU3 3-Slot Shelf is an all-metal construction
housing that has slots for 3 NIU3 horizontally-mounted
circuit cards. Card guides direct the card to the
backplane edge connector. When properly inserted,
61212073L1-5D
®
DS3 NIU3 3-Slot Shelf
Installation and Maintenance Practice

Figure 1. DS3 NIU3 3-Slot Shelf

Trademarks: Any brand names and product names included in this document are
trademarks, registered trademarks, or trade names of their respective holders.
CLEI Code: NCM5K4ZD_ _
thumbscrews on the NIU3 front panel align and fasten
to threaded holes on the shelf. Shelf slots are numbered
1 through 3, left to right, looking at the front of the shelf.
The backplane circuitry is protected by a metal cover
that has openings for BNC data jacks, pass-through
relays, power terminal connections, and alarm pins.
Removable covers provide security for power and alarm
connections, and pass-through and alarm relays. All
connections are clearly labeled.
Features
The NIU3 3-Slot Shelf provides the following features
and functions.
• Field replaceable pass-through relays ensure virtu-
ally uninterrupted transmission during card replace-
ment, failure, or power loss.
• BNC transmit/receive jacks provided for each
NIU3 card.
• Shelf alarm relay terminals provide alarm indica-
tion.
• Dual −48 VDC or ±24 VDC power feeds provided.
• Sturdy metal construction with durable powder-
coated enamel finish.
• Mounting and accessory hardware included.
Compliance
The NIU3 3-Slot Shelf is intended for installation in a
restricted access, environmentally controlled, or
protected location only.
See Table 1 for compliance codes.

Table 1. Compliance Codes

Code
Power Code (PC)
Telecommunication Code (TC)
Installation Code (IC)
Section 61212073L1-5D
Issue 4, August 2004
Input Output
F C
- -
E -
1