FCM-8520/8521-3 1000BASE-T GBIC Product Specification
F i n i s a r
VI. Environmental Specifications
The FCM-8520-3 has an extended range from 0°C to +75°C case temperature as
specified in Table 8.
Environmental
Specifications
Parameter
Operating Temperature
Storage Temperature
Symbol
T
op
T
sto
Min
0
-40
Typ
Max
75
85
Units
°C
°C
Notes/Conditions
Case temperature
Ambient temperature
Table 7. Environmental specifications
VII. Serial Communication Protocol
All Finisar GBICs are ‘Module Definition “4”’ and support the 2-wire serial
communication protocol outlined in the GBIC Specification
1
. These GBICs 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.”
5
The 1000BASE-T physical layer IC can also be accessed via the 2-wire serial bus at
address A4h. For details interfacing with the PHY IC, see Marvell data sheet titled
“Alaska Ultra 88E1011/88E1001S Integrated Gigabit Ethernet Transceiver”
6
(Marvell
document number MV-5100281-00).
Serial Bus Timing
Requirements
Parameter
I
2
C Clock Rate
Symbol
Min
0
Typ
Max
100,000
Units Notes/Conditions
Hz
Table 8. Serial bus timing requirements
Finisar Corporation
Rev A, Feb 2003
Page 5
FINISAR [ FINISAR CORPORATION. ]
