4
Issue 4, August 2004
61212073L1-5D
120 VAC outlet. (See
.) The output wire on the
PS/R terminates in a modular connector. An extension
wire with a matching connector is included. The
extension wire has ring terminals on the far end for
connection to the NIU3 shelf power terminals.
The red wire is –54 VDC and connects to the
PWR A
terminal; the black wire is the return and connects to the
RET A
terminal; the green wire connects to the frame
ground.
Figure 5. Power Supply/Rectifier Connection
Alarms
A 3-post wire-wrap terminal (
P7
) on the shelf
backplane selects either a normally closed (
COM
/
NC
)
or a normally open (
COM
/
NO
) alarm relay. The alarm
relay output responds to the card malfunction status on
individual NIU3 cards.
1. Determine if the desired alarm output is a NO or a
NC response.
2. Make wire-wrap connections accordingly.
3. If not already done, connect alarm output to
designated terminations.
CAUTION
After wiring connections are made, replace
power and alarm security covers.
Options
Aside from mounting configuration, connecting
redundant power, and alarm NO/NC selection, there are
no options associated with the shelf.
Final
After power and alarm wiring is connected and verified
in accordance with local standards, codes, and this
practice, perform the following tasks:
1. Dress and lace wiring to workmanship standards.
2. Install all protective shields and panels that were
removed for wiring installation.
3. Provide power to the backplane.
5. TURNUP
When an NIU3 is inserted into a shelf with power on the
backplane, the
STATUS
LED turns on red while the
NIU3 performs a self-test. If the test passes, the
STATUS
LED turns on green, and the other LEDs go
through an on/off sequence, indicating the NIU3 is
online. If the test fails, the
STATUS
LED remains red,
and the bypass relays (ADTRAN patent pending)
maintain data flow around the NIU3.
6. OPERATION
The NIU3 3-Slot Shelf exchanges data to and from the
network loop and customer loop via the BNC
connectors. If the NIU3 fails or is removed from the
circuit, the affected card relays on the backplane
provide pass-through transmission so data flow is
maintained.
During normal operation, the NIU3 is transparent to the
network. 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 3-slot shelf. However, NIU3
LEDs provide information for NIU3 and shelf configu-
ration and status.
7. MAINTENANCE
Aside from replacing failed relays, the NIU3 3-Slot
Shelf does not require maintenance for normal
operation. ADTRAN does not recommend field repair.
For repair services, refer to
.
PWR A
GRN
RED
BLK
TB1
-54V
2.0 A
RET A
PWR B
RET B
