4
Section 61212070L2-5, Issue 1
61212070L2-5A
Data
The standalone housing has four BNC connectors: two
(IN/OUT) for network receive/transmit, and two
(IN/OUT) for customer receive/transmit.
• Connect the appropriate cables to the BNCs.
• If not already accomplished, connect the opposite
ends to their designated terminations.
• Dress and lace the wire runs as necessary.
Fuse
The –48 VDC is fused on the NIU3 card.
Options
Aside from power source and ground termination,
there are no options associated with the NIU3
standalone housing.
3. TURN-UP
When an NIU3 is inserted into a standalone housing
with power on the host circuit board, the PWR LED
turns ON red while the NIU3 performs a self-test
during which the remaining LEDs go through an ON/
OFF sequence. If the test passes the PWR LED turns
ON green indicating the NIU3 is online. If the test
fails the LED remains red and the bypass relays
maintain data flow around the NIU3.
4. OPERATION
The NIU3 standalone host circuit board exchanges
data to and from the network loop and customer loop
via the BNC connectors. During operation the NIU3
is transparent to data flow. If the NIU3 fails or is
removed from the circuit, relays on the standalone
host circuit board provide pass through transmission
so data flow can resume.
During troubleshooting operation, the NIU3 will
loopback test data to the originating station. NIU3
troubleshooting tests are intrusive to data
transmission.
LED Indication
There are no LEDs on the standalone housing.
However, NIU3 LEDs provide indication for NIU3
and standalone housing configuration and status.
5. MAINTENANCE
The standalone housing does not require maintenance
for normal operation.
6. SPECIFICATIONS
Refer to
Table 1
for Configuration Codes and
Table 2
for standalone unit specifications and part numbers.
Compliance
Use one of the following requirements for powering
the unit locally:
a. Connect to a grounded –48 VDC source,
electrically isolated from the AC source. Provide
branch circuit overcurrent protection with a fuse
or circuit breaker, minimum 48 VDC, maximum
15 A. Provide an easily accessed approved and
rated disconnect device in the field wiring.
b. Connect to an approved Class 2 Type (LPS)
power supply rated 48 VDC, maximum 240 VA.
Standards
NEBS: Level 3
ANSI: T1.404
UL:
1950
Code
Input
Output
Power Code (PC)
F
C
Telecommunication Code (TC)
–
–
Installation Code (IC)
E
–
Table 1. Configuration Codes
