Finisar
Product Specification
125M-1.25Gbps Multi-Rate Smart SFP
CWDM Transceiver
FWLF2519C1Cxx (xx = 47~61)
PRODUCT FEATURES
•
•
•
•
125M-1.25Gbps Multi-rate Bi-
directional Data Links
Hot-pluggable SFP footprint
Built-in Digital Diagnostics Functions
Supporting Local DDMI
Support Remote DDMI via Built-in
Out-of-band, Non-intrusive Optical
Communication Channel
Optical “Dying Gasp”
IEEE 802.3ah 1000Base-LX Ethernet
1.06Gbps Fiber Channel
ITU-T CWDM DFB transmitter
PIN photodiode receiver
APPLICATIONS
•
•
Remote DDMI and Optical Link
Management
Optical-layer Demarcation
•
•
•
•
•
Finisar Smart SFPs are compatible with SFP Multi-Sourcing Agreement (MSA). In
addition to local digital diagnostics functions via the 2-wire series bus specified in the
SFP MSA, Smart SFPs also support remote digital diagnostics functions, i.e., when a
pair of Finisar’s Smart SFPs are on the same optical link, each end is capable of reading
digital diagnostics information from the other end. This function is accessed via a non-
intrusive optical communication channel. Additionally, Finisar’s Smart SFPs offer optical
Dying Gasp function. In order to utilize the remote DDMI and other advanced features
equipment vendors only need to make a simple modification to their system software
highlighted in the “Finisar Smart SFP host software interface specifications”, available
upon request from Finisar Corporation.
Finisar Corporation January 2011 Rev C
Page 1
FWLF2519C1Cxx Smart SFP Product Specification January 2011
Finisar
I.
Absolute Maximum Ratings
Symbol
Vcc-Vee
T
S
Min
-0.5
-40
Typ
Max
+3.6
85
Unit
V
°C
Ref.
Parameter
Power Supply Voltage
Storage Temperature
II.
Operating Environment
Symbol
Vcc
T
OP
RH
Min
+3.15
0
5
Typ
Max
+3.45
70
95
Unit
V
°C
%
Ref.
Parameter
Power Supply Voltage
Operating Case Temperature
Relative Humidity[Non-
Condensing]
III.
Electrical Characteristics (Top, VCC = 3.15 to 3.45 Volts)*
Symbol
Vcc
Icc
R
in
Vin
V
D
V
EN
Vout
300
2.0
0
400
Vcc
0.8
1000
0.8
Vcc
Min
3.15
Typ
3.3
Max
3.45
300
Unit
V
mA
Ω
mV
V
V
mV
Parameter
Supply Voltage
Supply Current
Transmitter
Input Differential Impedance
Data Input Swing Differential
Transmit Disable Voltage
Transmit Enable Voltage
Receiver
Data Output Swing Differential
Ref.
100
①
①
①
LOS Low
-
0
LOS High
-
2.0
* All characteristics are tested with communication channel turned on.
V
V
Note:
①.
Internally AC coupled;
IV.
Optical Characteristics (Top, VCC = 3.15 to 3.45 Volts)*
Symbol
λ
σλ
SMSR
P
OUT
ER
TR/TF
λ
C
R
SENS
P
OVR
Min
λ
C
−7.5
30
0
9
Typ
λ
Max
λ
C
+7.5
1
4
0.26
1460
0
1620
-25
Unit
Nm
Nm
dB
dBm
dB
Ns
Nm
dBm
dBm
④
④
②
③
Ref.
①
Parameter
Transmitter
Center Wavelength (CW)
Spectral Width (RMS)
Side Mode Suppression Ratio
Average Launch Power
Extinction Ratio
Rise/Fall Time
Receiver
Optical Center Wavelength
Average Rx Sensitivity
Receiver Overload
Finisar Corporation January 2011 Rev C
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FWLF2519C1Cxx Smart SFP Product Specification January 2011
Finisar
dB
dBm
dBm
dB
Optical Return Loss
24
LOS Asserted
-
-40
LOS De-Asserted
-
LOS Hysteresis
-
2
* All characteristics are tested with communication channel turned on.
-26
V.
Communication Channel Characteristics**
Max.
Unit
Bit/s
dB
Note
Parameter
Symbol
Min.
Typ.
Bit Rate
9600
Link Budget
25
** Communication channel is tested over 1.25G Ethernet link.
VI.
Data rate
Parameter
Data Rate
Symbol
Min.
125
Typ.
Max.
1250
Unit
Mbps
Note
Notes:
①.
ITU-T G.694.2 CWDM wavelength from 1470 nm to 1610 nm, at increment of 20 nm
②.
The measurement is made through a short patch cable
③.
Unfiltered, 20%~80%. Complies with IEEE 802.3 and FC 1x eye mask when filtered
④.
Measured with a PRBS 2
7
-1 test pattern over all data rates specified in Section VI, ER=9dB,
BER≤1×10
-12
Finisar Corporation January 2011 Rev C
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FWLF2519C1Cxx Smart SFP Product Specification January 2011
Finisar
VII. Digital Diagnostic Functions
Finisar Smart SFP support the 2-wire serial communication protocol as defined in the
SFP MSA
1
.
Additionally, the Finisar Smart SFP provides 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 E2PROM that is accessible over a
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), A0h stores static
information including product and vendor IDs while A2h contains real-time diagnostic
data.
The operating and diagnostics information is monitored and reported by a Digital
Diagnostics Transceiver Controller (DDTC) inside the transceiver, which is accessed
through a 2-wire serial interface. When the serial protocol is activated, the serial clock
signal (SCL) is generated by the host. The positive edge clocks data into the SFP
transceiver into segments of the E2PROM that are not write-protected. The negative
edge clocks data from the SFP transceiver. The serial data signal (SDA) is bi-directional
for serial data transfer. The host uses SDA in conjunction with SCL to mark the start and
end of serial protocol activation. The memories are organized as a series of 8-bit data
words that can be addressed individually or sequentially.
For more information, please contact Finisar.
Digital diagnostics for the Smart SFP are internally calibrated by default.
Finisar Corporation January 2011 Rev C
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FWLF2519C1Cxx Smart SFP Product Specification January 2011
Finisar
VIII. Enhanced Management and Diagnostic Capabilities
Finisar Smart SFP CWDM transceivers can be used in the typical network configuration
shown below:
EMS/CLI
Smart SFP
S
Smart SFP
Switch/ Router
S
S
…
S
Mux/
Demux
Mux/
Demux
S
…
…
S
DSLAM
Near-end
Equipment
Switch/ Router
The Smart SFP’s built-innon-intrusive optical communication channel enables remote
monitoring and management. Through the I2C interface, the host equipment can manage
not only the local Smart SFPs, but also the Smart SFPs located at the far end. These
enhanced functions are available by following “Finisar Smart SFP Host Interface
Specifications”
With Finisar’s Smart SFPs, equipment vendors can achieve the following advanced
management and diagnostic capabilities:
•
•
•
Remote Smart SFP digital diagnostics
Optical link monitoring
Optical dying gasp for fault isolation. With optical dying gasp when power
failure is imminent, the far-end Smart SFP will quickly generate adying gasp
signal to the near-end Smart SFP on the other end. The near-end equipment can
thereby distinguish between far-end power failure and optical cable cut.
Finisar Corporation January 2011 Rev C
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