RoHS Compliant
TX-1490/RX-1310 nm Single-mode Bi-directional (15 dB margin)
SFP LC Simplex Connector, with Diagnostic MonitoringIEEE 802.3ah 1000BASE-BXFeatures
 RoHS Compliant
 IEEE802.3ah 1000BASE-BX10 application
 Compliant with SFF8472 Digital DiagnosticStandard
 Industry standard small form pluggable (SFP)
package Hot Pluggable Class 1 laser product complies with EN 60825-1

Ordering Information
PART NUMBER

TX/RX

TEMPERATURE

LD TypeDistance

GB4931-SFP-LC.S20

1490/1310

0C to 70 C1490 DFB20km

GB4931-SFP-LC.S20(WT)

1490/1310-40 C to 85 C1490 DFB

20km

Diagnostics
Parameter

Range

Accuracy

UnitTemperature-40 to 95±3oVoltage

3.0 to 3.6± 0.1

VBias Current

0 to 100± 10%mA

TX Power-11 to 0± 3 dBdBm

RX Power-23 to –3± 3 dBdBm

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Date:04/15/2015

Calibration

CWebsite: www.dci.jp

External

RoHS Compliant
TX-1490/RX-1310 nm Single-mode Bi-directional (15 dB margin)
SFP LC Simplex Connector, with Diagnostic MonitoringIEEE 802.3ah 1000BASE-BX

Absolute Maximum Ratings
PARAMETERSYMBOLMIN

MAXUNITS

Storage TemperatureTS4085

C

Supply Voltage

Vcc0.54.0

V

Input Voltage

VIN

0.5VccV

SYMBOLMIN

MAXUNITSTC

0-407085

C

Supply Voltage

Vcc

3.1

3.5

V

Supply Current

ITX + IRX---300mA

RH

595%

NOTE

Recommended Operating Conditions
PARAMETER
Case Operating Temperature

Relative Humidity(Non-condensing)Page 2 of 8
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NOTE

RoHS Compliant
TX-1490/RX-1310 nm Single-mode Bi-directional (15 dB margin)
SFP LC Simplex Connector, with Diagnostic MonitoringIEEE 802.3ah 1000BASE-BX

Transmitter Electro-optical Characteristics
Vcc = 3.1 V to 3.5 V, TC = 0 C to 70 C (-40 C to 85 C )PARAMETER
Output Optical Power
9/125 m fiber

SYMBOLMIN

TYP.

MAXUNITS

NOTE

Pout

8---

2dBm

Average

Extinction Ratio

ER9------dB

Center Wavelength

C

1480

1490

1500

nm

Spectral Width (RMS)---

---

1.0

nm

Rise/Fall Time, (2080%)

Tr , f

---

---

260

ps

Relative Intensity Noise

RIN---

---

120

dB/Hz

Total Jitter

TJ---

---

227

ps

Output Eye

Compliant with IEEE802.3z

Max. Pout TX-DISABLE AssertedPOFF------

45

dBm

Differential Input Voltage

VDI FF0.4---

2.0

VTransmit Fault Output-Low

TX_FAULTL

0.0---

0.5

VTransmit Fault Output-High

TX_FAULTH

2.4---VCC

V

Time to initialize, include reset ofTX_FAULT

t_init

---

---

300

ms

TX_FAULT from fault to assertiont_fault

---

---

100

s

TX_DISABLE time to start resett_reset10------

sPage 3 of 8
Version 2.2
Date:04/15/2015

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RoHS Compliant
TX-1490/RX-1310 nm Single-mode Bi-directional (15 dB margin)
SFP LC Simplex Connector, with Diagnostic MonitoringIEEE 802.3ah 1000BASE-BX

Receiver Electro-optical Characteristics
Vcc = 3.1 V to 3.5 V, TC = 0 C to 70 C (-40 C to 85 C )PARAMETERSYMBOLMIN

TYP.

MAXUNITS

NOTE

Optical Input Power-maximum

PI N

2---

---

dBm

PRBS7, BER < 1012RX Sensitivity

PI N------

23dBmPRBS7, BER < 1012

Operating Center WavelengthC1260

---

1360

nm

Optical Return Loss

ORL14------dB

=1260~1360nm

Optical isolation

ISO-------45dB

=1480~1500nm

LOS Deasserted

PD------

23dBmLOS AssertedPA35------dBm

Differential Output Voltage

VDI FF

0.5---

1.2

VT r, f---

---

0.35

nsRX_LOS L

0---

0.5

V

RX_LOS H

2.4---

VCC

V

Data Output Rise, Fall Time
(2080%)Receiver Loss of Signal Output
Voltage-Low
Receiver Loss of Signal Output
Voltage-High

Page 4 of 8
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RoHS Compliant
TX-1490/RX-1310 nm Single-mode Bi-directional (15 dB margin)
SFP LC Simplex Connector, with Diagnostic MonitoringIEEE 802.3ah 1000BASE-BX

Dimensions

Tc point

DIMENSIONS ARE IN MILLIMETERSALL DIMENSIONS ARE 0.2mm UNLESS OTHERWISE SPECIFIED

Page 5 of 8
Version 2.2
Date:04/15/2015

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RoHS Compliant
TX-1490/RX-1310 nm Single-mode Bi-directional (15 dB margin)
SFP LC Simplex Connector, with Diagnostic MonitoringIEEE 802.3ah 1000BASE-BX

SFP host board mechanical layout

XY

S XYA
1LX A S
1PIN1

LX A SLEGEND

AS B S

1. PADS AND VIAS ARE CHASSIS GROUND
2. THROUGH HOLES, PLATING OPTIONAL
3. HATCHED AREA DENOTES COMPONENTAND TRACE KEEPOUT(EXCEPT CHASSISGROUND)
4.AREA DENOTES COMPONENT KEEPOUT(TRACES ALLOWED)PIN1DIMENSIONS ARE IN MILLIMETERSA S B S
AS B S

Unit: mm

Page 6 of 8
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RoHS Compliant
TX-1490/RX-1310 nm Single-mode Bi-directional (15 dB margin)
SFP LC Simplex Connector, with Diagnostic MonitoringIEEE 802.3ah 1000BASE-BX

Assembly drawing
1.7±0.9
3.5±0.3
41.73±0.5
PCB15.25±0.1

10.4±0.1

11.0 REF.

9.8 MAXCAGE ASSEMBLY

0.4±0.1 BELOW PCB

15.0 MAX

BEZEL

16.25±0.1
MSA-SPECIFIED BEZELPCBDIMENSIONS ARE IN MILLIMETERS

Unit: mmPage 7 of 8
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Date:04/15/2015

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RoHS Compliant
TX-1490/RX-1310 nm Single-mode Bi-directional (15 dB margin)
SFP LC Simplex Connector, with Diagnostic MonitoringIEEE 802.3ah 1000BASE-BX

Pin Assignment
Pin-Out

Pin

PIN 11

PIN 20

PIN 10PIN 1Signal Name

Description

12345TGND

678

TTL Low
Open Circuit
Receiver Loss of Signal, TTL High, open collector

910MOD_DEF (0)RATE SELECTRX_LOSRGND
RGND

11RGND

Receiver Ground

1213RX
RX
RGND
VCCR
VCCT
TGND

Receive Data Bar, Differential , ac coupled
Receive Data, Differential , ac coupled

1415
16
17

TX_FAULTTX_DISABLE
MOD_DEF (2)
MOD_DEF (1)Transmit Ground
Transmit Fault
Transmit Disable
SDA Serial Data Signal
SCL Serial Clock Signal

Receiver Ground
Receiver Ground

Receiver Ground
Receiver Power Supply
Transmitter Power Supply
Transmitter Ground18Transmit Data, Differential , ac coupled
TX
19Transmit Data Bar, Differential , ac coupled
TX
T
20
Transmitter Ground
GND
Note : All information contained in this document is subject to change without notice.

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