Installation Guide

Method of Procedure
Operations and Maintenance
124 RFN_3.1 Beta
7.3.3.2 Airlink Chassis Unit
ACU front ports Description
RJ45 Port 1 NCU—connects the ACU to the NCU
RJ45 Ports 2-8 not currently used
EIA-232 9-pin serial port for debugging—Customer Service use only
ACU back ports
Ports 1-8 (RJ45) RFUs—up to 8 RFUs may be connected to the ACU
5MHz/1PPs IN not currently used
5MHz/1PPs OUT not currently used
GPS ANT not currently used
Each card installed in the front and back of the ACU has two LEDs: Power (top)
indicates power, and Status (lower) indicates the status of the card. Each RJ45
port has two LEDs: Link (right) indicates Ethernet connectivity, and Activity (left)
blinks to indicate Ethernet activity. All LEDs should light as green. For all other
conditions, refer to the following table.
Indication Possible failure Corrective action
Power or Status LEDs
for cards installed in
front or back of ACU are
not lit
no power to ACU
 Verify that the power cord is
installed and properly seated.
 Verify that the power source is
operational (120VAC or
–48VDC).
 Contact Customer Support.
Status LED is red—any
card
card is not operational
 Remove and reseat card.
 Contact Customer Support.
failed initialization
 Reboot the system: unplug the
ACU, and plug it in again. Boot
up may take several minutes.
fan is not working
 Verify that the fan is
operational.