Finisar AN-2030 specifications Scope and Overview, 35 2. Applicable Documents

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AN-2030: Digital Diagnostic Monitoring Interface for Optical Transceivers

F i n i s a r

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Application Note AN-2030

 

2

 

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Digital Diagnostic Monitoring Interface

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for SFP Optical Transceivers

 

 

 

 

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61. Scope and Overview

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8This document defines an enhanced digital diagnostic monitoring interface available in

9Finisar SFP and GBIC optical transceivers. The i nterface allows real time access to

10device operating parameters, and it includes a sophisticated system of alarm and

11warning flags which alerts end-users when particular operating parameters are outside

12of a factory set normal range. The interface is fully compliant with SFF-8472, “Digital

13Diagnostic Monitoring Interface for Optical Transceivers", revision 9.3.

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15These digital diagnostic features are implemented in all Finisar SFP transceivers that

16contain a “D” in the part number suffix (for example, FTRJ -1319-7D-2.5), as well as

17DWDM and CWDM GBICs. All next generation Finisar SFPs utilizing the new part

18numbering scheme (e.g. FTRJ1621P1BCL) also have the same diagnostic capability.

19

20The interface is an extension of the serial ID interface defined in the GBIC specification

21as well as the SFP MSA. Both specifications define a 256-byte memory map in

22EEPROM, which is accessible over a 2-wire serial interface at the 8 bit address

231010000X (A0h). The digital diagnostic monitoring interface makes use of the 8 bit

24address 1010001X (A2h), so the originally defined serial ID memory map remains

25unchanged. The interface is identical to, and is thus fully backward compatible with both

26the GBIC Specification and the SFP Multi Source Agreement. The complete interface is

27described in Section 3 below.

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29The operating and diagnostics information is monitored and reported by a Digital

30Diagnostics Transceiver Controller (DDTC), which is accessed via a 2-wire serial bus.

31Its physical characteristics are defined in Section 4.

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352. Applicable Documents

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37Gigabit Interface Converter (GBIC). SFF document number: SFF-0053, rev. 5.5,

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September 27, 2000.

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40Small Form Factor Pluggable (SFP) Transceiver MultiSource Agreement (MSA),

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September 14, 2000.

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43Digital Diagnostic Monitoring Interface for Optical Transceivers: SFF-8472, Draft

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Revision 9.3, August 1, 2002.

 

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9/26/02 Revision D

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Contents 35 2. Applicable Documents Scope and OverviewEnhanced Digital Diagnostic Interface Definition Overview Specific Data Field Descriptions Password Entry 8 bytesCal Constants Bytes Control Functions 8 bytesData Serial ID Data Fields Address A0Name Bytes Description of Field Address Identifier ConnectorIdentifier values Extended IdentifierDescription of connector Connector valuesTransceiver codes TransceiverEncoding 4a Sonet Reach SpecifiersSpeed Reach Specifier bit Description Code Description of encoding mechanismLength 9μ-km BR, nominalLength 9μ Length 50μVendor name Length CopperDwdm Channel Spacing Vendor OUILaser Wavelength Vendor RevDwdm Wavelength Fraction Option values OptionsBR, max 13 BR, minDate Code Diagnostic Monitoring TypeData Description of field Address N i s a r Enhanced Options SFF-8472 Compliance 10 I/O Timing for Soft Control & Status Functions11 SFF-8472 Compliance Diagnostics 13 Digital temperature format Temperature 12 Bit weights C for temperature reporting registersN i s a r 14 Alarm and Warning Thresholds 2-Wire Address A2h Alarm and Warning ThresholdsN i s a r 16b Format for offsets 16a Unsigned fixed-point binary format for slopes16d Example of Floating Point Representation 16c IEEE-754 Single-Precision Floating Point Number FormatBit Name Description LOS Alarm and Warning Flags18 Alarm and Warning Flag Bits 2-Wire Address A2h 20 User Eeprom 2-Wire Address A2h 19 Password Addresses 2-Wire Address A2hByte Bit Name Description Address # Bytes Name DescriptionDdtc Electrical Interface Definition Overview Wire Interface OperationN i s a r Current Address Read Detailed 2 -Wire Serial Port Operation N i s a r Wire Protocol Data Transfer Protocol Vcc = 3.15V to DC Electrical CharacteristicsFor More Information
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