DH+/RIO OPTICAL COMMUNICATION MODULES USERS MANUAL
Copyright © 2003 by Phoenix Digital Corporation, All Rights Reserved.
termination and/or cross-wiring on individual hardwired network stubs (network segments leading to
the electrical connection on each fiber optic module), duplicate node address settings, incompatible
baud rate settings, etc., on one or more devices on the network. In order to find these types of
problems it is often necessary to start-up the overall network one part at a time... after the fiber optic
network grid is installed and operational.
Phoenix Digital’s fiber optic modules allow the user to disable the Local Interface on the J1 or
J2 connectors, at one or more locations on the network grid, through Diagnostic Select Switches
(see Tables 9 and 11). When the Local Interface is Disabled the fiber optic modules will still function
as active repeaters on the fiber optic network, but will disable all communications (read/write) on the
Local Interface J1 or J2 connector. Thus, if an unknown problem exists somewhere on the network,
individual hardwired network stubs leading from each fiber optic module may be taken off-line until
the source of the failure is isolated and the problem itself is identified and corrected.
The Local Interface should always be disabled when a fiber optic module is used as an active
repeater (i.e. no connection to the Local Interface on the J1 or J2 connectors).
1.3.3.10 OPTICAL POWER METERING (“-D” OPTION...
850 nm and 1300 nm MULTIMODE ONLY)
Phoenix Digital fiber optic modules provide two analog outputs (one per optical network re-
ceive input), proportional to the receive optical signal strength at the module, for optical power
measurement. These two analog outputs provide an abDC voltage representation of
the optical power level or Receive Signal Strength (RSS) for each network receive input. The
RSS outputs are buffered for increased drive current capability. RSS output specifications are
the following:
Linear Outputs
(Ch A RSS, Ch B RSS)
Voltage Range (V
out
) = 0 to +3.5 VDC
Drive Current (I
out
)
= 20 ma (max)
RSS analog outputs are provided on the J1 Connector Pin #s 1, 2, and 3, on the front of Standalone,
Panelmount OCMs and 1771 Plug-In OCMs. (See Figures 3 and 4, and Table 1 for OCM Device
Interface J1 Connector Pin Definitions.)
RSS analog outputs are provided on RSS Test Jacks on the front of 1746 Plug-In OLC and 1756
Plug-In OCX modules. (See Figures 5 and 6 for OLC and OCX RSS Test Jack Designations.)
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