Fiberplex SFP-BHDVXC-0000-L, User Manual, Page: 14 / 24

Serial Configuration Interface
The SFP 2‐wire serial interface (MOD_DEF1/MOD_DEF2) provides also digital diagnostic monitoring via the
SERIAL CONFIG INTERFACE. The serial interface uses the 2‐wire serial EEPROM protocol defined for the ATMEL
AT24C02 family component. The memory is organized as a series of 8‐bit data words that can be addressed
individually or sequentially. The 2‐wire serial bus address 1010001X (A2h) is used for SERIAL CONFIG
INTERFACE access.
Figure 6 Serial Config Interface Memory Mapping
The table below defines the information structures that are obtained from the SFP Transceiver via the SERIAL
CONFIG INTERFACE.
Table 3: Serial Configuration Interface Registers
Addr Field Name Registry Name Description Default
Value
(hex) Default
Value
(dec)
0
Alarm &
Warning
Thresholds
Temp High Alarm (MSB) Internal Temperature High Alarm Threshold 55h +85°C
1 Temp High Alarm (LSB) 00h
2 Temp Low Alarm (MSB) Internal Temperature Low Alarm Threshold D8h ‐40°C
3 Temp Low Alarm (LSB) 00h
4 Temp High Warning (MSB) Internal Temperature High Warning Threshold 50h +80°C
5 Temp High Warning (LSB) 00h
6 Temp Low Warning (MSB) Internal Temperature Low Warning Threshold DDh ‐35°C
7 Temp Low Warning (LSB) 00h
8 Voltage High Alarm (MSB) Internal Voltage High Alarm Threshold 8Ch +3.6V
9 Voltage High Alarm (LSB) A0h
10 Voltage Low Alarm (MSB) Internal Voltage Low Alarm Threshold 75h +3.0V
11 Voltage Low Alarm (LSB) 30h
12 Voltage High Warning (MSB) Internal Voltage High Warning Threshold 87h +3.47V
13 Voltage High Warning (LSB) 8Ch
14 Voltage Low Warning (MSB) Internal Voltage Low Warning Threshold 7Ah +3.14V
15 Voltage Low Warning (LSB) A8h
16‐39 NA . Not Applicable XXh..
40‐55 Unallocated Unallocated Reserved XXh...
56‐91 Ext Cal
Constant NA Not Applicable XXh..
92‐94 Unallocated Unallocated Reserved XXh...
95 CC_DMI Checksum Checksum XXh
96
Diagnostics
Temperature (MSB) Measured Internal Temperature XXh °C
97 Temperature (LSB) XXh
0
95
55
119
127
Alarm and Warning
Thresholds
(56 bytes)
Cal Constants
(40 bytes)
Vendor Specific
(8bytes)
Two wire Address A2h (10100001Xb)
Real Time Diagnosc
Interface
(24 bytes)