User Manual

Users Guide - Andrew InCell™ Fiber Optic Distributed Antenna System
5-3
CDU Front Panel Indicators
The POWER indicator for each port of the CDU indicates that the DC power is present at that
port. If the CDU POWER indicator is green, power is good at that CDU port, also indicating
that the internal AC power supply is good. If the POWER indicator for one CDU port is off,
there is problem with that CDU port interface. If the POWER indicators for all CDU ports are
off, the AC power supply may be bad, AC power may be switched off or there may be another
problem with the AC power.
The LINK indicator at each CDU port shows that the CDU generated pilot tone was sent over
the downlink from the CDU to the ERAU then received and transmitted over the uplink path
from the ERAU back to the CDU. When the CDU LINK indicator is off, the downlink and
uplink optical paths are installed correctly and DC power is present in the ERAU. If the LINK
indicator is red, there may be a problem with the fiber optic signals between the CDU and
ERAU; a problem with the ERAU power; or a problem with the ERAU itself. The CDU
indicators allow system installers and maintainers to easily determine each ERAU functional
status, power distribution to each ERAU, and the correct connection of the fiber optic cables.
Table 5-1. CDU and ERAU LED Status
Condition LED Status
POWER LED LINK LED
Power Off Off Off
All Good, No Problems Green Off
Power Good, All Links Good Green Off
Power Good, Link Bad Green Red
CDU Alarm Functions
The CDU has two dry contact alarm outputs on the rear panel to indicate the overall health of the
power supply and the uplink and downlink to each Enhanced Remote Antenna Units. The LINK
alarm output is a summary alarm of all of system uplinks and downlinks and remote antenna
power. The alarm outputs are through a DB-9 connector located on the CDU chassis rear panel.
The alarm relays are open for a fault condition and closed for a good condition.
Table 5-2. Alarm Connector Pin Out
Alarm Connector Pin Alarm Pin Description
1 Summary LINK Alarm +
2 Summary LINK Alarm -
3 CDU POWER Alarm +
4 CDU POWER Alarm -
5-9 No Connection