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AN-2030: Digital Diagnostic Monitoring Interface for Optical Transceivers F i n i s a r
9/26/02 Revision D Page 2
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3. Enhanced Digital Diagnostic Interface Definition 2
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Overview 4
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The enhanced digital diagnostic interface is a superset of the MOD-DEF interface 6
defined in the SFP MSA document dated September 14, 2000. The 2-wire interface pin 7
definitions, hardware, and timing are clearly defined there, as well as in Section 4 8
below. This section describes an extension to the memory map defined in the SFP 9
MSA. The enhanced interface uses the two wire serial bus address 1010001X (A2h) to 10
provide diagnostic information about the module’s present operating conditions. A 11
memory map is shown in Figure 3.1 below. 12
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The transceiver generates this diagnostic data by digitization of internal analog signals. 14
Calibration and alarm threshold data is written during device manufacture. 15
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In addition to generating digital readings of internal analog values, the device generates 17
various status bits based on comparison between current values and factory-preset 18
limits. 19
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