PHOENIX DIGITAL OCM-DPR-1 - Fault Predictive Communication; Wavelength Selection

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DH+/RIO OPTICAL COMMUNICATION MODULES USERS MANUAL

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1.2.2 FAULT PREDICTIVE COMMUNICATION (850 nm and 1300 nm

MULTIMODE ONLY)

Phoenix Digital’s Fault Predictive Communication Technology provides diagnostic monitoring and

detection of impending communication failures resulting from gradual degradation of the communica-

tion link itself. Phoenix Digital’s fiber optic modules monitor impending fault conditions by 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

automatically detect and annunciate the impending failure conditions via visual indicators on the front

of the module. Phoenix Digital’s fiber optic modules also provide User Program Accessible, Inter-

active Diagnostics (1771, 1746, and 1756 Plug-In Fiber Modules) and Hardwired 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

VDC range) for more precise monitoring of communication link status (on-line optical power meter-

ing). Thus, communication link status is continuously monitored and impending failure conditions are

annunciated by the fiber modules before the communication failure actually occurs, enabling mainte-

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!