User Manual

Users Guide - Andrew InCell™ Fiber Optic Distributed Antenna System
5-4
Table 5-3. System Alarm Monitoring
Condition ALARM
LINK POWER
Power Off Open Open
All Good, No Problems Short Short
All Links Good Short X
Link Bad Open X
Power Good X Short
Power Bad X Open
Unused CDU Ports
Any ports on the CDU that are not connected to an ERAU will cause the built-in-
test system in the InCell system to indicate a link error condition. This error
condition will be seen on the CDU front panel Link indicators and will also
appear as a Link error at the Alarm output.
In order to not set off the alarm, each unused CDU port must have a simplex fiber
optic jumper cable between the U/L and D/L fiber optic connectors. The jumper
must have SC/APC connectors on each end. Refer to the InCell Accessories
section of this manual for a jumper part number.
Remote Monitoring Functions
InCell™ Systems support optional remote system health monitoring using standard protocols
that allow customers to monitor full system status. This feature uses an embedded processor to
monitor and report system health for the CDU and all ERAUs, including power supplies, uplink
and downlink paths and cables.
With this option, the InCell™ System hardware can be remotely monitored in three ways:
• Locally using a RS-232 connection to a terminal or PC (see Figure 5-1)
• Remotely using an SNMP Agent chassis connected to a telephone, LAN/WAN or other
communications medium
• Remotely using dry-contact terminals connected to a third party SCADA
In the first method, the RS-232C interface option does not require a separate chassis. An RS-485
bus daisy chains the system status and alarms together as illustrated in Figure 5-1 and Figure 5-2.
Communications between CDUs is accomplished over an RS-485 link, and the user can connect
to the master bus using a standard computer or RS-232C terminal.