UDS-117
GigE SFP
3-38
3EM23952AA
Issue 01, September 2009
The module provides LOS alarm (loss of input power signal alarm). This output
signal indicates the received optical power is below the worst-case receiver
sensitivity (as defined by the standard in use).
The transceiver has an EEPROM to provide Remote Inventory RI information.
DDM supports analog parameter measurements such as temperature, laser
bias, and laser power.
Figure 117-2. Optical SFP Module Block Diagram
950-0002-1
072009
MONITOR
PIN PD
LD
LASER
DRIVER
AUTOMATIC
POWER CONTROL
CIRCUIT
100 7
100 7
100 7
4.7 k7 TO
10 k7
4.7 k7 TO
10 k7
4.7 k7 TO
10 k7
4.7 k7
SFP MODULE HOST MODULE
(A) TRANSMITTER
(B) RECEIVER
(C) EEPROM
EEPROM
DIAGNOSTIC
MONITOR
TEMPERATURE
SUPPLY VOLTAGE
TX BIAS CURRENT
TX OUTPUT POWER
RX RECEIVED POWER
MOD-DEF (0)
MOD-DEF (1)
MOD-DEF (2)
PIN PD
TD+
TD-
VccT
VccT
VccT
VccR
TX DISABLE
TX FAULT
RD-
RD+
POST-
AMP
PRE-
AMP
LOS
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