FWDM-1619-7D-xx SFP Product Specification May 2003

F i n i s a r

© Finisar Corporation May 2003 Rev.D

Page 6

VIII.

Digital Diagnostic Functions

Finisar FWDM-1619-7D-xx SFP transceivers support the 2-wire serial communication

protocol as defined in the draft SFP MSA

defined in the GBIC standard, with the same electrical specifications.

The standard SFP serial ID provides access to identification information that describes

the transceiver’s capabilities, standard interfaces, manufacturer, and other information.

Additionally, Finisar SFP transceivers provide a unique enhanced digital diagnostic

monitoring interface, which allows real-time access to device operating parameters such

as transceiver temperature, laser bias current, transmitted optical power, received optical

power and transceiver supply voltage. It also defines a sophisticated system of alarm and

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

a factory set normal range.

The SFP MSA defines a 256-byte memory map in E

2-wire serial interface at the 8 bit address 1010000X (A0h). The digital diagnostic

monitoring interface makes use of the 8 bit address 1010001X (A2h), so the originally

defined serial ID memory map remains unchanged. The interface is identical to, and is

thus fully backward compatible with both the GBIC Specification and the SFP Multi

Source Agreement. The complete interface is described in Finisar Application Note AN-

2030: “Digital Diagnostics Monitoring Interface for SFP Optical Transceivers”.