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2. DESCRIPTION
The DS3 NIU3 12-Slot Housing is an all-metal
construction housing with slots for 12 NIU3 modules.
Guide grooves direct the card to the backplane edge
connector and when properly inserted, thumbscrews on
the NIU3 front panel align and fasten to threaded holes
on the housing. Housing slots are numbered 1 to 12, left
to right, looking at the front of the chassis. The
backplane circuitry is protected by a metal cover with
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. A
cable management bar and wire tie-down anchor points
complete the assembly. All connections, terminals, and
jacks are clearly labeled.
Compliance
Table 1
shows the compliance codes for the DS3 NIU3
12-Slot Housing. The DS3 NIU3 12-Slot Housing is
NRTL listed to the applicable UL standards. The DS3
NIU3 12-Slot Housing is to be installed in a restricted
access location and in a Type "B" or "E" enclosure
only.
Table 1. Compliance Codes
Code
Power Code (PC)
Telecommunication Code (TC)
Installation Code (IC)
The DS3 NIU3 12-Slot Housing meets the following
standards:
• NEBS: Level 3
• ANSI: T1.404
• UL:
60950
• FCC:
Part 15, Class A
3. INSTALLATION
C A U T I O N !
SUBJECT TO ELECTROSTATIC DAMAGE
OR DECREASE IN RELIABILITY.
HANDLING PRECAUTIONS REQUIRED.
After unpacking the unit, inspect it for damage. If
damage has occurred, file a claim with the carrier, then
contact ADTRAN Customer Service. Refer to the
Warranty and Customer Service
information. If possible, keep the original shipping
2
Input
Output
F
C
–
–
E
–
section for further
Issue 6, August 2004
container for returning the DS3 NIU3 12-Slot Housing
for repair or for verification of shipping damage.
Shipping Contents
The contents include the following items:
• DS3 NIU3 12-Slot Housing
• DS3 NIU3 12-Slot Housing Job Aid
Install per requirements of NEC NFPA 70. After instal-
lation, ensure equipment rack stability is not upset.
CAUTION
Electronic modules can be damaged by ESD.
When handling modules, wear an antistatic
discharge wrist strap to prevent damage to
electronic components. Place modules in
antistatic packing material when transporting
or storing. When working on modules, always
place them on an approved antistatic mat that is
electrically grounded.
Location
The DS3 NIU3 12-Slot Housing installs at any location
convenient to the customer as a demarcation and
loopback point for DS3 circuits. The NIU3 can pass
both network and customer signals up to 900 feet.
During NIU3 bypass operations, if total transmission
distance exceeds 900 feet, signal quality may degrade.
Figure 2
on page 3 illustrates the maximum recom-
mended transmission distances.
Rackmount
NOTE
Install the unit per NEC NFPA 70 require-
ments. For more information, refer to the
Compliance
section.
The DS3 NIU3 12-Slot Housing can be bay mounted at
any convenient location. Reversible mounting flanges
adjust to desired position in the 19-inch rack. Also
included are 23-inch flanges.
To install the DS3 NIU3 12-Slot Housing, perform the
following steps:
1. Determine intended shelf extension from the rack.
2. Position the mounting flanges as necessary using
the appropriate flanges for a 19-inch or 23-inch
rack. Install using the supplied countersink screws.
61212078L1-5F
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