Finisar AN-2030 specifications Enhanced Digital Diagnostic Interface Definition Overview

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AN-2030: Digital Diagnostic Monitoring Interface for Optical Transceivers

F i n i s a r

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23. Enhanced Digital Diagnostic Interface Definition

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4Overview

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6 The enhanced digital diagnostic interface is a superset of the MOD-DEF interface

7defined in the SFP MSA document dated September 14, 2000. The 2-wire interface pin

8definitions, hardware, and timing are clearly defined there, as well as in Section 4

9below. This section describes an extension to the memory map defined in the SFP

10MSA. The enhanced interface uses the two wire serial bus address 1010001X (A2h) to

11provide diagnostic information about the module’s present operating conditions. A

12memory map is shown in Figure 3.1 below.

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14The transceiver generates this diagnostic data by digitization of internal analog signals.

15Calibration and alarm threshold data is written during device manufacture.

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17In addition to generating digital readings of internal analog values, the device generates

18various status bits based on comparison between current values and factory-preset

19limits.

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9/26/02 Revision D

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Contents Scope and Overview 35 2. Applicable DocumentsEnhanced Digital Diagnostic Interface Definition Overview Cal Constants Bytes Password Entry 8 bytesSpecific Data Field Descriptions Control Functions 8 bytesName Bytes Description of Field Address Serial ID Data Fields Address A0Data Identifier values ConnectorIdentifier Extended IdentifierConnector values Description of connectorTransceiver Transceiver codesSpeed Reach Specifier bit Description 4a Sonet Reach SpecifiersEncoding Code Description of encoding mechanismLength 9μ BR, nominalLength 9μ-km Length 50μDwdm Channel Spacing Length CopperVendor name Vendor OUIDwdm Wavelength Fraction Vendor RevLaser Wavelength BR, max OptionsOption values 13 BR, minData Description of field Address Diagnostic Monitoring TypeDate Code N i s a r Enhanced Options 11 SFF-8472 Compliance 10 I/O Timing for Soft Control & Status FunctionsSFF-8472 Compliance Diagnostics 12 Bit weights C for temperature reporting registers 13 Digital temperature format TemperatureN i s a r Alarm and Warning Thresholds 14 Alarm and Warning Thresholds 2-Wire Address A2hN i s a r 16a Unsigned fixed-point binary format for slopes 16b Format for offsets16c IEEE-754 Single-Precision Floating Point Number Format 16d Example of Floating Point RepresentationBit Name Description Alarm and Warning Flags LOS18 Alarm and Warning Flag Bits 2-Wire Address A2h Byte Bit Name Description 19 Password Addresses 2-Wire Address A2h20 User Eeprom 2-Wire Address A2h Address # Bytes Name DescriptionWire Interface Operation Ddtc Electrical Interface Definition OverviewN i s a r Current Address Read Detailed 2 -Wire Serial Port Operation N i s a r Wire Protocol Data Transfer Protocol DC Electrical Characteristics Vcc = 3.15V toFor More Information