DH+/RIO OPTICAL COMMUNICATION MODULES USERS MANUAL
Copyright © 2003 by Phoenix Digital Corporation, All Rights Reserved.
2.4 DIAGNOSTIC STATUS INDICATOR DEFINITION
2.4.1 STANDALONE, PANELMOUNT OCMs AND 1771 PLUG-IN OCMs
(REFERENCE FIGURES 3 AND 4 FOR FIBER OPTIC MODULE
NOMENCLATURE AND DESIGNATIONS).
(i) Tx (Local) - Illuminates when the tramsmit data output is active (transmit data from
the OCM Device Interface to the local device).
(ii) Rx (Local) - Illuminates when the receive data input is active (transmit data from
the local device to the OCM Device Interface).
(iii) ACT (Ch A, B Active) - Illuminates green when the corresponding optical network
receive input is receiving a valid data carrier.
(iv) ISD (ChA, B Initial Signal Detect) - Illuminates green when the corresponding
optical network receive input is initialized for Impending Fault Detection (see
Section 1.3.3.7 for Initialization Procedure).
(v) IFD (ChA, B Impending Fault Detect) - Illuminates red when the corresponding
optical network receive input power level drops 3.0 decibel-milliwatts (optical)
below the Initial Signal Strength (see Section 1.3.3.7 for Initialization Procedure).
(vi) ERR (ChA, B Communication Error) - Illuminates red when the corresponding
optical network receive input fails to detect valid data communications.
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