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25G Base SFP28 SR Optical Transceiver

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8. All contents are Copyright © 1996 - 20 1 9 Wavesplitter Technologies, Inc. All rights reserved. Prelim inary and Proprietary www.wavesplitter.com Page 8 of 9 Document Number: 95 - 0269 - V1.0 25G SFP28 SR 100m Transceiver WST - S28 - SR - C Mechanical Drawing Product shall be of design, construction and physical dimensions specifie d on applicable product drawing. Unit: mm

6. All contents are Copyright © 1996 - 20 1 9 Wavesplitter Technologies, Inc. All rights reserved. Prelim inary and Proprietary www.wavesplitter.com Page 6 of 9 Document Number: 95 - 0269 - V1.0 25G SFP28 SR 100m Transceiver WST - S28 - SR - C 19 TD - Transmitter Inverted Data Input 20 VeeT Module Transmitter Ground 1 Notes: 1. GND is the symbol for signal and supply (power) common for the modul e. All are common within the module and all module voltages are reference to this potential unless otherwise noted. Module circuit ground is isolated from modu le chassis ground within the module. 2. Open collector, should be pulled up with 4.7~10K ohms on the host board to a voltage between 3.15V and 3.6V Recommended Host - Transceiver Interface Block Diagram

7. All contents are Copyright © 1996 - 20 1 9 Wavesplitter Technologies, Inc. All rights reserved. Prelim inary and Proprietary www.wavesplitter.com Page 7 of 9 Document Number: 95 - 0269 - V1.0 25G SFP28 SR 100m Transceiver WST - S28 - SR - C Memory map User Writable EEPROM (120 bytes) Vendor Specific (8 bytes) Control Functions Reserved Vendor Specific Alarm and Warning Threshold (56 bytes) Cal Constants (40 bytes) Real Time Diagnostic Interface (24 bytes) Vendor Specific (7 bytes) P age Select Byte (Optional) Serial ID Defined by SFP MSA (96 bytes) Vendor Specific (32 bytes) Reserved, SFF - 8079 (128 bytes) 0 55 95 119 126 127 128 247 255 Page 00h/01h Page 02h Pages 03h - 7Fh Pages 80h - FFh 2wire address 1010000x (A0 h) 2wire address 1010001x (A2h)

5. All contents are Copyright © 1996 - 20 1 9 Wavesplitter Technologies, Inc. All rights reserved. Prelim inary and Proprietary www.wavesplitter.com Page 5 of 9 Document Number: 95 - 0269 - V1.0 25G SFP28 SR 100m Transceiver WST - S28 - SR - C P in Assignment PIN Symbol Description Ref. 1 Veet Module T ransmitter Ground 1 2 TX_Fault Module Transmitter Fault 2 3 TX_Disable Transmitter Disable, turns off the laser output 4 SDA 2 - wire Serial Interface Data Lane 5 SCL 2 - wire Serial Interface Clock 6 Mod_ABS Module Absent, connected To VeeT or VeeR in the module 7 RS0 Rate Select 0, optionally controls SFP+ module Receiver 8 RX_LOS Receiver Loss of Signal Indication 9 RS1 Rate Select 1, optionally controls SFP+ module transmitter 10 VeeR module receiver ground 1 11 VeeR module receiver ground 1 12 RD - Receiver inverted Data Output 13 RD+ Receiver Non - inverted Data Output 14 VeeR Module Receiver ground 1 15 VccR Module Receiver 3.3V Supply 16 VccT Module Trans mitter 3.3V Supply 17 VeeT Module Transmitter Ground 1 18 TD+ Transmitter Non - inverted Data Input

1. Data Sheet All contents are Copyright © 1996 - 20 19 Wavesplitter Technologies, Inc. All rights reserved. Preliminary and Proprietary www.wavesplitter.com Page 1 of 9 G eneral P roduct C haracteristics Parameter Value Unit Comments Module Form Factor SFP28 As defined by SFF - 8432 Module Form Factor Maximum Aggregate Data Rate 25.78125 Gb/s Protocols Supported InfiniBand, Ethernet Electrical Interface and Pin - out 20 - pin edge connector Pin - out as defined by SFF - 8419 Maximum Power Consumption per End 0.8 Watts Varies with output voltage swing and pre - emphasis settings Management Interface Serial, I 2 C - based , 400 kHz maximum frequency As defined by SFF - 847 2 Features: ◼ Hot Pluggable SFP28 form factor ◼ Supports auto - rate d etection for both 25.78125Gb/s and 10.3125Gb/s operatio n ◼ Up to 70m transmission with OM3 multi - Mode fiber ◼ Up to 100m transmission with OM4 multi - Mode fiber ◼ 850nm VCSEL Laser/PIN Photo Detector ◼ Low Power Dissipation, M ax 0.8W ◼ Operating Case Temperature: 0 ºC ~70 ºC ◼ SFF - 8419: Low Speed Electrical ◼ SFF - 8432: Plugg able Module ◼ SFF - 8472: Management Interface ◼ Compliant to Class 1 Laser Safety ◼ GR - 468: Reliability Qualification ◼ IEEE 802.3by: Physical Layer Spe cifications and Man agement Parameters ◼ ROHS - 6: Environment Safety Applications: ◼ Ethernet for 25/10GBASE - SR ◼ Infin iBand EDR, FDR, QDR ◼ Proprietary Interconnections

4. All contents are Copyright © 1996 - 20 1 9 Wavesplitter Technologies, Inc. All rights reserved. Prelim inary and Proprietary www.wavesplitter.com Page 4 of 9 Document Number: 95 - 0269 - V1.0 25G SFP28 SR 100m Transceiver WST - S28 - SR - C Optical Characteristics Parameter Symbol Min. Typ. Max. Unit. Ref. Transmitter S ignaling Speed lane 25 . 78125 ± 100ppm G b/s O ptical wavele ngth λ 840 850 860 nm RMS Spectral Width △ λ rms 0.6 nm Average launch power P avg - 8.4 +2.4 dBm Optical Modulation Amplitude (OMA) P OMA - 6.4 +3 1 Optical Extinction Ratio ER 2 dB Transmitter and Dispersion Penalty TDP 4.3 dB Average Laun ch Power of OFF Transmitter P OFF - 30 dBm Relative Intensity Noise RIN 12 OMA - 128 dB/Hz Receiver S ignaling Speed lane 25 . 78125 ± 100ppm G b/s O ptical wavelength λ 840 850 860 nm Average Receiver Power - 10.3 3 dBm 2 Receiver Sensitivity in OM A RxSen. - 10 dBm 3 Receiver Reflectance - 12 dB Notes: 1. Class 1 Laser Safety limit per FDA/CDRH, and EN (IEC) 60825 laser safety standards. 2. Average receive power, each lane (min) is informative and not the principal indicator of signal strength. 3. Inf ormative only.

2. All contents are Copyright © 1996 - 20 1 9 Wavesplitter Technologies, Inc. All rights reserved. Prelim inary and Proprietary www.wavesplitter.com Page 2 of 9 Document Number: 95 - 0269 - V1.0 25G SFP28 SR 100m Transceiver WST - S28 - SR - C Abs o lute Maximum Ratings Exceeding the limits below may damage the optical transceiver module permanently. Parameter Symbol Min. Typ. Max . Unit. Ref. Maximum Supply Voltage V cc - 0.5 3.6 V Storage Temperature T sto - 40 85 °C Case Operating Temperatu re T st 0 70 °C Relative Humidity RH 0 85 % 1 Note : 1. No - condensing . P arameters Parameter Symbol Min. Typ. Max. Unit. Ref. Supply Voltage V cc 3.14 3.46 V Power Consumption P Con 0.8 W Bit Rate BR 10.3125 25.78125 Gb/s 1 Bit Error Ratio BER 10 - 12 2 Center wavelength λ c 840 860 nm 3 Beam divergence 23  Number of Lanes 1 Management Interface Serial, I2C - based, maximum frequency 400 kHz 4 Logic Input Voltage High V ih 2 Vcc+0.3 V Logic Input Voltage Low V il - 0.3 0.8 V Notes: 1. Single lane 2. PRBS= 2 31 - 1 @ 25.78125Gb/s 3. As defined by IEEE Std. 802.3by - 2015 4. As defined by SFF - 8672

9. Page 9 of 9 Document Number: 95 - 0269 - V1.0 25G SFP28 SR 100m Transceiver WST - S28 - SR - C Ordering Information Part No Specification Package Data rate per Lane Laser Optical Power Detector Max. Receive Sensitivity (OMA) Temp Reach Other Application code WST - S28 - S R - C SFP28 25.78 Gb p s each Channel 850nm VCSEL - 8 .4 ~ + 2.4 each Channel PIN - 1 0 dBm each Channel 0~ 70 °C 7 0 m via OM 3, 100m via OM4 DDM RoHS 25 G Ethernet Modific ation History Revision Date Description Originator Review Approved V 1 .0 2 6 - Aug - 20 1 9 New Issue Ivy Chen Wa yne Liao Wayne Liao All specification data are accurate on the date of publication for product co mparisons and ordering information. WaveSp litter Technologies, Inc. reserves the right to change specifications without notice. U.S. Branch 2080 Rancho Higuera Ct. Fremont, CA 9 45 3 9, USA Tel: 510 - 651 - 7800 Fax: 510 - 651 - 7822 Taipei Headquarters 16F - 5, No. 75, Sec. 1, Xintai 5th Rd., Xizhi Dist. , New Taipei C ity 221 01 , Taiwan Tel: +886 - 2 - 2 698 - 7208 Fax: +886 - 2 - 2 698 - 7210 ShenZ hen Branch 610#, 6F, No.204 Building, 2nd Industrial zone Nanyou, Nanshan district, Shenzhen, Guangdong China 518054 Tel: +86 - 755 - 86265980 Fax: +86 - 755 - 26642741

3. All contents are Copyright © 1996 - 20 1 9 Wavesplitter Technologies, Inc. All rights reserved. Prelim inary and Proprietary www.wavesplitter.com Page 3 of 9 Document Number: 95 - 0269 - V1.0 25G SFP28 SR 100m Transceiver WST - S28 - SR - C E lectrical C haracteristics Parameter Symbol Min. Typ. Max. Unit. Ref. Transceiver Power Supply Current I cc 230 mA Transceiver Power on Initializati on Time T init 2000 ms Trans mitter at TP1a Differential Data Input Voltage Peak to Peak Swing V in,pp 900 mV Common Mode Noise RMS 17.5 mV Differential Input Return Loss SDD22 Per OIF CEI - 28G - VSR and CAUI - 4 Requirements dB Common Mode to Diff erential Conversion and Differential to Common Mode Conversion SDD22 SCD22 dB Common Mode Return Loss SCC22 dB Transition Time, 20% to 80% T r , T f 10 ps Common Mode Voltage V cm - 0.3 2.8 V Eye Width @ 1E - 15 Probability EW15 0.46 UI Eye Heigh t @ 1E - 15 Probability EH15 94 mv Receiver at TP4 Differential Data Output Voltage Peak to Peak Swing V opp 300 900 mV Differential Output Impedance Zos 90 100 110 Ohms Common Mode Voltage V cm - 0.35 2.85 V Common Mode Noise RMS 17.5 m V Differential Output Return Loss SDD22 Per OIF CEI - 28G - VSR and CAUI - 4 Requirements dB Common Mode to Differential Conversion and Differential to Common Mode Conversion SDD22 SCD22 Common Mode Return Loss SCC22 - 2 dB Transition Time, 20% to 80% T r , T f 10 ps Eye Width @ 1E - 15 Probability EW15 0.57 UI Eye Height @ 1E - 15 Probability EH15 228 mV

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