GB-SFP-6031-20
SFP 3.125Gb/s 1310nm 20KM SFP Transceiver
PRODUCT FEATURES
Up to 3.125Gb/s data links with DDM
DFB laser transmitter and PIN photo-detector.
Up to 20km on 9/125µm SMF
Hot-pluggable SFP footprint
Duplex LC/UPC type pluggable optical interface
Low power dissipation
Metal enclosure, for lower EMI
RoHS compliant and lead-free
Support Digital Diagnostic Monitoring interface
Single +3.3V power supply
Compliant with SFF-8472
Case operating temperature
Commercial: 0°C to +70°C
Extended: -10°C to +80°C
Industrial: -40°C to +85°C
APPLICATIONS
Switch to Switch Interface
Gigabit Ethernet
1
Switched Backplane Applications
Router/Server Interface
Other Optical Links
PRODUCT DESCRIPTION
GB-LINK’s GB-SFP-6031-20 Small Form Factor Pluggable (SFP) transceivers are compatible with the Small
Form Factor Pluggable Multi-Sourcing Agreement (MSA), The transceiver consists of five sections: the LD driver,
the limiting amplifier, the digital diagnostic monitor, the 1310nm DFB laser and the PIN photo-detector. The
module data link up to 20KM in 9/125um single mode fiber.
The optical output can be disabled by a TTL logic high-level input of Tx Disable, and the system also can disable
the module via I2C. Tx Fault is provided to indicate that degradation of the laser. Loss of signal (LOS) output is
provided to indicate the loss of an input optical signal of receiver or the link status with partner. The system can
also get the LOS (or Link)/Disable/Fault information via I2C register access.
Ordering information
Data
Product part Number
Rate
Media
(Mbps)
Single mode
GB-SFP-6031-20S
3125
GB-SFP-6031-20E
3125
GB-SFP-6031-20I
3125
fiber
Single mode
fiber
Single mode
2
fiber
Temperature Range
Wavelength
Transmission
(nm)
Distance(km)
1310
20
0~70
commercial
1310
20
-10~80
extended
1310
20
-40~85
industrial
(Tcase)
I.
Pin Descriptions
Pin
Symbol
Name/Description
NOTE
1
VEET
Transmitter Ground (Common with Receiver Ground)
1
2
TFAULT
Transmitter Fault.
3
TDIS
Transmitter Disable. Laser output disabled on high or open.
2
4
MOD_DEF(2)
Module Definition 2. Data line for Serial ID.
3
5
MOD_DEF(1)
Module Definition 1. Clock line for Serial ID.
3
6
MOD_DEF(0)
Module Definition 0. Grounded within the module.
3
7
Rate Select
No connection required
4
8
LOS
Loss of Signal indication. Logic 0 indicates normal operation.
5
9
VEER
Receiver Ground (Common with Transmitter Ground)
1
10
VEER
Receiver Ground (Common with Transmitter Ground)
1
11
VEER
Receiver Ground (Common with Transmitter Ground)
1
12
RD-
13
RD+
Receiver Non-inverted DATA out. AC Coupled
14
VEER
Receiver Ground (Common with Transmitter Ground)
15
VCCR
Receiver Power Supply
16
VCCT
Transmitter Power Supply
17
VEET
Transmitter Ground (Common with Receiver Ground)
18
TD+
Transmitter Non-Inverted DATA in. AC Coupled.
19
TD-
20
VEET
Notes:
3
Receiver Inverted DATA out.
Transmitter Inverted DATA in.
AC Coupled
1
1
AC Coupled.
Transmitter Ground (Common with Receiver Ground)
1
1. Circuit ground is internally isolated from chassis ground.
2. Laser output disabled on TDIS >2.0V or open, enabled on TDIS <0.8V.
3. Should be pulled up with 4.7k - 10kohms on host board to a voltage between 2.0V and 3.6V. MOD_DEF(0)
pulls line low to indicate module is plugged in.
4. This is an optional input used to control the receiver bandwidth for compatibility with multiple data rates (most
likely Fibre Channel 1x and 2x Rates). If implemented, the input will be internally pulled down with > 30kΩ
resistor. The input states are:
Low (0 – 0.8V):
Reduced Bandwidth
(>0.8 , < 2.0V):
Undefined
High (2.0 – 3.465V):
Full Bandwidth
Open:
Reduced Bandwidth
5. LOS is open collector output.
Should be pulled up with 4.7k - 10kohms on host board to a voltage between
2.0V and 3.6V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.
Figure 2. Pin out of Connector Block on Host Board
II.
Absolute Maximum Ratings
Parameter
Symbol
Min.
Storage Temperature
Ts
Storage Ambient Humidity
4Power Supply Voltage
Signal Input Voltage
Receiver Damage Threshold
Max.
Unit
-40
85
ºC
HA
5
95
%
VCC
-0.5
4
V
-0.3
Vcc+0.3
V
5
Typ.
dBm
Note
III. Recommended Operating Conditions
Parameter
Case Operating Temperature
Symbol
Tcase
Min.
Typ.
Max.
70
-10
80
-40
85
70
%
3.47
V
300
mA
100
mVp-p
100Hz to 1MHz
Mbps
TX Rate/RX Rate
HA
5
Power Supply Voltage
VCC
3.13
Power Supply Current
ICC
3.3
Power Supply Noise Rejection
Data Rate
3125/3125
Transmission Distance
20
Coupled Fiber
GB-SFP-6031-20
ºC
XGSF-1330-20DE-F
XGSF-1330-20DA-F
Non-condensing
KM
Single mode fiber
9/125um SMF
Specification of Transmitter
Parameter
Symbol
Min.
POUT
-5
Average Output Power
Extinction Ratio
ER
8.2
Center Wavelength
λC
1290
SMSR
30
Side Mode Suppression Ratio
Max.
Unit
Note
0
dBm
Note (1)
1330
nm
dB
1310
1
nm
-45
dBm
RIN
90
100
110
Compliant with G.959 (class 1 laser safety)
Ohm
Note (1). Measure at 2^23-1 NRZ PRBS pattern
Note (2). Transmitter eye mask definition
DFB Laser
dB
σ
Transmitter OFF Output Power
Differential Line Input Impedance
Output Eye Mask
Typ.
POff
Spectrum Bandwidth(-20dB)
5
Note
0
Ambient Humidity
IV.
Unit
Note (2)
1+y3
Mean level
of centre of
logical “1”
1
y2
0.5
y1
Mean level
of centre of
logical “0”
0
-y4
0
V.
x2
x3
1
Specification of Receiver
Parameter
Symbol
Min.
Center Wavelength
λC
1270
Receiver Sensitivity
PIN
Input Saturation Power (Overload)
PSAT
Max.
Unit
PIN-TIA
dBm
-1
PA
Los Of Signal De-assert
PD
-35
PA-PD
0.5
Note
1610
-18
Los Of Signal Assert
LOS Hysteresis
Typ.
Note (1)
dBm
-19
dBm
dBm
2
6
Note (2)
dB
Note (1). Measured with Light source 1310nm, ER=8.2dB; BER =<10^-12 @PRBS=2^23-1 NRZ
Note (2). When LOS de-asserted, the RX data+/- output is High-level (fixed)
VI. Electrical Interface Characteristics
Parameter
Transmitter
Total Supply Current
Transmitter Disable Input-High
Transmitter Disable Input-Low
Transmitter Fault Input-High
Transmitter Fault Input-Low
Receiver
Total Supply Current
6LOSS Output Voltage-High
LOSS Output Voltage-Low
Symbol
Min.
ICC
VDISH
VDISL
VDISL
VTxFH
Typ.
Max.
Unit
Note
A
Vcc+0.3
0.8
Vcc+0.3
0.8
mA
V
V
V
V
Note (1)
2
0
2
0
ICC
VLOSH
B
Vcc+0.3
mA
V
Note (1)
2
VLOSL
0
0.8
V
LVTTL
Note (1). A (TX)+B (RX) = 300mA
(Not include termination circuit)
VII. Digital Diagnostic Functions
GB-LINK GB-SFP-6031-20 transceivers support the 2-wire serial communication protocol as defined in the SFP
MSA. It is very closely related to the E2PROM defined in the GBIC standard, with the same electrical
specifications.
The standard SFP serial ID provides access to identification information that describes the transceiver’s capabilities,
standard interfaces, manufacturer, and other information.
Additionally, GB-LINK SFP transceivers provide 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), so the originally defined serial ID memory map remains unchanged. The interface is identical to, and is thus
fully backward compatible with both the GBIC Specification and the SFP Multi Source Agreement.
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, Mod Def 1) is generated by the host. The positive edge clocks
data into the SFP transceiver into those segments of the E2PROM that are not write-protected. The negative edge
clocks data from the SFP transceiver. The serial data signal (SDA, Mod Def 2) 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.
Digital diagnostics for the GB-SFP-6031-20 are Internally calibrated by default.
VIII. Recommend Circuit Schematic
7
3.3V
VCC
1uH
Protocol Vcc
VccT
1uH
10uF
RES1
GB-Link SFP Module
0.1uF
10uF
0.1uF
10K
Tx_Disable
Tx_Disable
Tx_Fault
Tx_Fault
0.1uF
TD+
100 Ohm
Laser Driver
TDVeeT
Laser Diode
0.1uF
VccR
SerDes IC
RES1
10uF
0.1uF
RD+
Protocol IC
0.1uF
Amplifier
100 Ohm
RD-
Photo Diode
0.1uF
Rx_LOS
Rx_LOS
VeeR
3.3V
RES1
RES1
RES1
Mod_def 2
Mod_def 1
PLD/PAL
Mod_def 0
RES1=4.7K to10K Ohms
* Depands onSerDes IC used
8
EEPROM
IX. Mechanical Specifications (Unit:mm)
GB-SFP-6031-20
X. Regulatory Compliance
Feature
ESD
Electrostatic discharge
Electromagnetic Interference (EMI)
Laser Eye Safety
Component Recognition
Performance
IEC/EN 61000-4-2
Compatible with standards
FCC Part 15 Class B EN 55022 Class B
(CISPR 22A)
FDA 21CFR 1040.10, 1040.11 IEC/EN
60825-1 2
IEC/EN 60950
UL
Compatible with standards
Class 1 laser product
Compatible with standards
ROHS
2002/95/EC
Compatible with standards
EMC
EN61000-3
Compatible with standards
Appendix A. Document Revision
9
Reference
10
Version No.
Date
Description
1.0
2010-08-20
Preliminary datasheet
2.0
2011-09-10
Update format and company’s logo
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