DH+/RIO OPTICAL COMMUNICATION MODULES USERS MANUAL
Copyright © 2003 by Phoenix Digital Corporation, All Rights Reserved.
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The ultra-high speed, self healing communication technology on each fiber optic module will auto-
matically redirect network traffic around points of failure (wrapback communication). In a failed
condition the fiber optic communication network will self heal around a fault by redirecting data
communications around the point of failure. This is accomplished by wrapping back network com-
munications at the communication nodes on either side of the point of failure, through the use of a
high-speed, combinational wrapback communication switch (hardware pass-thru, non-software in-
teractive) built into the front-end optical interface of each Phoenix Digital fiber optic module.
Figure 2 illustrates a typical fiber optic DH+ fault tolerant ring network configuration. In this configu-
ration, the fiber optic modules must be connected Ch A Transmit to Ch A Receive, Ch A Transmit to
Ch A Receive, etc., around the ring (counter-clockwise in Figure 2); and Ch B Transmit to Ch B
Receive, Ch B Transmit to Ch B Receive, etc., around the ring (clockwise in Figure 2). Diagnostic
monitoring circuitry at each module will continuously monitor the integrity of the communication car-
riers present at the receive data inputs of each communication channel. This high speed combina-
tional diagnostic monitoring circuitry will monitor and detect communication failures in carrier sym-
metry, jitter, amplitude, and babble. In the event a fault condition is diagnosed on the network
(Figure 2: Node 2/Channel B receiver and Node 3/Channel A receiver) the fiber modules detecting
the failure (Nodes 2 and 3) will immediately redirect communication around the point of failure, the
opposite way around the ring. Essentially, the network dynamically reconfigures to form a new
communication path from Node 2 to Node 3, away from the point of failure (the long way around the
network), thus insuring communication network continuity and fault isolaton. In addition to providing
network fault tolerance, Phoenix Digital’s fiber optic modules enable maintenance personnel to locate
fault conditions (remote status monitoring), add/delete nodes, and splice/terminate/replace media on-
line, without disrupting network communications.
Communication continuity will be unconditionally maintained by the fiber optic modules in the
event of either node or media failure. When the source of the network failure is corrected, the
fiber optic modules will automatically restore the communication network to its original traffic pat-
terns.
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