DH+/RIO OPTICALCOMMUNICATION MODULES USERS MANUAL
Copyright © 2003 by Phoenix Digital Corporation,All Rights Reserved.
1-7
1.2.2 FAULT PREDICTIVE COMMUNICATION (850 nm and 1300 nm
MULTIMODE ONLY)
Phoenix Digital’s Fault Predictive CommunicationTechnology provides diagnostic monitoring and
detectionof impendingcommunication failuresresultingfrom gradualdegradation ofthe communica-
tionlink itself. Phoenix Digital’sfiber opticmodules monitor impendingfault conditionsby continu-
ously measuring the actual in-line signal strength (optical power) of the data comunications at each
receive input on the module. The fiber modules continuously compare these actual in-line measure-
ments to preset optical power reference thresholds, which are normalized to power levels where
valid network communications will still be assured, but impending communication failures can be
accurately predicted. If the actual in-line data communication signal strength degrades below these
power thresholds (resulting from one or more sources of link degradation) the fiber modules will
automaticallydetect andannunciate theimpending failureconditionsviavisualindicators onthe front
of the module. Phoenix Digital’s fiber optic modules also provide User ProgramAccessible, Inter-
activeDiagnostics(1771, 1746,and 1756 Plug-InFiber Modules) andHardwired Diagnostic Ouputs
(Standalone, Panelmount Fiber Modules) for remote monitoring, detecting, and locating of impend-
ing fault conditions (remote status monitoring). In addition, the fiber optic modules provide a linear
DC voltage representation (analog) of the actual in-line signal strength (normalized for a 0 to +3.5
VDCrange)for moreprecisemonitoring ofcommunicationlink status(on-lineoptical powermeter-
ing). Thus,communication linkstatus iscontinuouslymonitoredandimpending failureconditions are
annunciatedby the fibermodules beforethecommunication failureactually occurs,enablingmainte-
nance personnel to perform Predictive Maintenance on the fiber optic communication network at-
large. (The Impending Fault Monitoring feature is available only on 850 nm or 1300 nm
multimode fiber optic modules with the “-D” Diagnostic Option.)
1.2.3 WAVELENGTH SELECTION
Phoenix Digital’s fiber optic modules provide five options for wavelength selection. The
economical 850 nanometer multimode wavelength may be selected for data communication
networks with less than 12,000 feet (3,650 meters) between communication nodes. The higher
performance 1300 and 1550 nanometer multimode wavelengths may be selected for longer
distance applications, extending communication distances between nodes to over 6 miles (10
kilometers). For maximum distance, the ultra-high performance 1300 and 1550 nanometer
singlemode wavelengths may be selected, extending communication distances to over 16 miles
(25 kilometers) between communication nodes!
