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3. Install the cable management bar to the rear cover
of the housing using the supplied pan-head screws.
4. Mount the housing to the rack accordingly.
Wallmount
Two additional brackets, available separately from
ADTRAN, allow the chassis to be mounted to a wall:
• With the DS3 NIU3 12-Slot Housing Swingarm
Bracket (P/N 1212078L1WM) six ¼ by ¾ inch
bladed hex-head screws and flat washers are
provided with the wallmount bracket for attaching
to the wall. In this configuration, the original
flanges are removed, and the wallmount flanges are
installed using the countersink screws from the
originals. Install the chassis so the front panels of
the circuit modules face outward on the front.
A 2-foot 16 AWG ground wire is also provided to
be installed between the ground termination on the
bracket and the ground termination on the housing.
This allows the chassis to rotate without disturbing
the main ground wire leaving the bracket.
CAUTION
When rotating the chassis, always do so with
care to ensure that all wiring and connections
are protected.
• With the DS3 NIU3 12-Slot Housing Vertical
Mounting Bracket (P/N 1212078L1WMB) four ¼
by 1¾ inch hex-head screws are provided to mount
the L-brackets to the wall (re-use the flange
screws). Mount the chassis with the top toward the
wall and the module slots to one side.
Central Office
Portable
Test
DSX-3
Set
XCONN
Panel
DACS
Test
Head
61212078L1-5F
4. WIRING
Wiring consists of three elements: data, power/ground,
and alarms. Use suitably-sized copper conductors only.
Data
Externally, the DS3 NIU3 12-Slot Housing backplane
has four BNC connectors for each of the 12 NIU3 slots.
• Two upper
• Two lower (
Wiring Connections
Connect data wiring per the following procedure:
1. Connect the cables to the BNCs on the DS3 NIU3
2. If not already accomplished, connect the opposite
3. Dress and lace the wire runs to the rack frames as
SONET
ADM
Ring
Figure 2. NIU3 Circuit Diagram
Issue 6, August 2004
CAUTION
There are 24 removable bypass relays and 1
removable alarm relay located on the rear of
the housing. After installation, remove the
bypass relay cover and alarm relay cover and
ensure that the relays are properly and firmly
seated in their sockets. Replace the relay
covers.
) for Network Receive/
(IN/OUT
Transmit.
) for Customer Receive/
IN/OUT
Transmit
(Figure 3
on page 4).
12-Slot Housing backplane for those shelf slots
that will be populated.
ends to their designated terminations.
necessary.
Customer Premises
900
DS3
ADM
NIU
CPE
Loopback
Button
3
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