Finisar AN-2030 用户手册

AN-2030: Digital Diagnostic Monitoring Interface for Optical Transceivers 

 

 

9/26/02 Revision D 

 

Page 1 

1 

2 

3 

4 

5 

6 

7 

This document defines an enhanced digital diagnostic monitoring interface available in 

8 

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

9 

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

10 

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

11 

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

12 

Diagnostic Monitoring Interface for Optical Transceivers", revision 9.3. 

13 

 

14 

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

15 

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

16 

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

17 

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

 

18 

 

19 

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

20 

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

21 

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

22 

1010000X (A0h).  The digital diagnostic monitoring interface makes use of the 8 bit 

23 

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

24 

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

25 

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

26 

described in Section 3 below. 

27 

 

28 

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

29 

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

30 

Its physical characteristics are defined in Section 4. 

31 

 

32 

 

33 

 

34 

2.   Applicable Documents  

35 

 

36 

 

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

37 

 

September 27, 2000. 

38 

 

39 

 

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

40 

 

 

September 14, 2000. 

41 

 

42 

 

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

43 

 

 

Revision 9.3, August 1, 2002. 

44 

 

45 

    

46 

47