Finisar AN-2030 Date Code, Diagnostic Monitoring Type, Data Description of field Address

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AN-2030: Digital Diagnostic Monitoring Interface for Optical Transceivers

F i n i s a r

1

 

 

2

Date Code

 

3

The date code is an 8-byte field that contains the vendor’s

date code in ASCII

4characters. The date code is mandatory. The date code shall be in the format specified

5by table 3.7.

6

 

Table 3.7: Date Code

7

 

 

 

Data

Description of field

 

Address

 

 

 

 

 

84-85

ASCII code, two low order digits of year. (00 = 2000).

 

 

 

86-87

ASCII code, digits of month (01 = Jan through 12 =

 

 

Dec)

 

88-89

ASCII code, day of month (01 - 31)

 

90-91

ASCII code, vendor specific lot code, may be blank

8

9Diagnostic Monitoring Type

10“Diagnostic Monitoring Type” is a 1 byte field with 8 single bit indicators describing how

11diagnostic monitoring is implemented in the particular transceiver (see Table 3.8).

12Bit 6, address 92, is set in Finisar ‘7D’ SFPs, 'P' SFPs under the new part numbering

13scheme, and WDM GBICs, indicating that digital diagnostic monitoring has been

14implemented. Received power monitoring, transmitted power monitoring, bias current

15monitoring, supply voltage monitoring and temperature monitoring are all implemented.

16Additionally, alarm and warning thresholds are written as specified in this document at

17locations 00 – 55 on 2 wire serial address 1010001X (A2h) (see Table 3.14).

18If bit 5, “internally calibrated”, is set, the transceiver reports calibrated values directly

19in units of current, power etc. If bit 4, “externally calibrated”, is set, the reported

20values are A/D counts which must be converted to real world units using calibration

21values read using 2 wire serial address 1010001X (A2h) from bytes 55 - 95. Finisar

22transceivers use both calibration types so it is necessary to read bit 5 in order to

23properly interpret transceiver data .

24Bit 3 indicates whether the received power measurement represents average input

25optical power or OMA. If the bit is set, average power is monitored. If it is not, OMA is

26monitored. Finisar transceivers report “average power” and thus bit 3 is set.

27Bit 2 indicates whether or not a special “address change” sequence (described in SFF-

288472) is required. This sequence is NOT required in Finisar modules. Information at

29both 2-wire addresses (A0h and A2h) may be accessed simply by using the appropriate

30address during the 2-wire communication sequence.

31Finisar SFP/GBIC transceivers thus have 0b01111000 written at address 92 if they are

32 internally calibrated, and 0b01011000 written at address 92 if they are externally

33calibrated. Note that internally calibrated devices can be treated as externally calibrated

34devices because the external calibration constants are set to 1 or 0 as appropriate.

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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