FWLF-1631-XX DWDM SFP Preliminary Product Specification – August 2005
Finisar
IX. Serial Communication Protocol
All Finisar SFPs support the 2-wire serial communication protocol outlined in the SFP
MSA
1
. These SFPs use an Atmel AT24C01A 128 byte E
2
PROM with an address of A0h.
For details on interfacing with the E
2
PROM, see the Atmel data sheet titled
“AT24C01A/02/04/08/16 2-Wire Serial CMOS E
2
PROM.”
7
Finisar’s DWDM SFPs also support extended diagnostic features as described in Finisar
Applications Note AN-2030, “Digital Diagnostic Monitoring Interface for Optical
Transceivers”
5
. (Additional information is available in document titled: “Digital Diagnostic
Monitoring Interface for Optical Transceivers Rev 9.3”
8
). A controller IC that monitors
system parameters such as laser current, module temperature, transmitter power, and
received power is accessible at address A2H.
Parameter
I
2
C Clock for Atmel
(A0H) and Controller
IC (A2H)
Symbol
C
atmel
Min
0
Typ
Max
100,000
Units Notes/Conditions
Hz
Bus can be driven blind.
©
Finisar Corporation
Rev B, August 2005
PRELIMINARY and Confidential
Page 8
FINISAR [ FINISAR CORPORATION. ]
