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25G LAN-WDM 2

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25G Base LAN-WDM SFP28 40km Transceiver (I-Temp)

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8. All contents are Copyright © 1996 - 20 1 9 Wavesplitter Technologies, Inc. All rights reserved. Preliminary and Proprietary www.wavesplitter.com Page 8 of 9 Document Number: 95 - 0240 - V 1 .1 2 5Gb/s LAN - WDM SFP 28 4 0km Transceive r ( Preliminary ) WST - S28 - LM4Hxx - I Mechanical Design Diagram LC connector Unit: mm

6. All contents are Copyright © 1996 - 20 1 9 Wavesplitter Technologies, Inc. All rights reserved. Preliminary and Proprietary www.wavesplitter.com Page 6 of 9 Document Number: 95 - 0240 - V 1 .1 2 5Gb/s LAN - WDM SFP 28 4 0km Transceive r ( Preliminary ) WST - S28 - LM4Hxx - I Host - Transceiver Interface Block Diagram

7. All contents are Copyright © 1996 - 20 1 9 Wavesplitter Technologies, Inc. All rights reserved. Preliminary and Proprietary www.wavesplitter.com Page 7 of 9 Document Number: 95 - 0240 - V 1 .1 2 5Gb/s LAN - WDM SFP 28 4 0km Transceive r ( Preliminary ) WST - S28 - LM4Hxx - I Digital Diagnostic Functions WaveSplitter’s WST - S28 - LM4Hxx - I transceivers support the 2 - wire serial communication protocol as defined in the SFP+ MSA. The standard SFP serial ID provides access to identification information that describes the transceiver’ s capabilities, standard interfaces, manufacturer, and other information. Additionally, WaveSplitter’s SFP+ transceivers provide a unique enhanced digital diagnostic monitoring interface, which allows real - time access to device operating parameters such a s 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 EEPROM 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 operating and diagnostics information is monitored and reported by a Digital Diagnostics Transceiver Controller (DDTC) inside the transceiver, which is accessed throug h 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. Th e 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 o rganized as a series of 8 - bit data words that can be addressed individually or sequentially.

4. All contents are Copyright © 1996 - 20 1 9 Wavesplitter Technologies, Inc. All rights reserved. Preliminary and Proprietary www.wavesplitter.com Page 4 of 9 Document Number: 95 - 0240 - V 1 .1 2 5Gb/s LAN - WDM SFP 28 4 0km Transceive r ( Preliminary ) WST - S28 - LM4Hxx - I Notes: 1. To be determined for power budget requirements and laser safety consideration . 2. “ XX ” is:86 , 91 , 95 , 00 , 04 , 09 , from wavelength 1286.66 , 1291.10 , 1295.56 , 1300.05 , 1304.58 , 1309.14 3. Measured with a PRBS 2 31 - 1 test pattern, @ 25.78 Gb/s, BER @ 5 * 10 - 5 4. T o be determined for Industrial temperature range. Pin Assignment Pin out of Connector Block on Host Board Pin Symbol Name/Description NOTE 1 V EET Transmitter Ground ( Common with Receiver Ground) 1 2 T FAULT Transmitter Fault. 2 3 T DIS Transmitter Disable. Laser output disabled on high or open. 3 4 SDA 2 - wire Serial Interface Data Line 4 5 SCL 2 - wire Serial Interface Clock Line 4 6 MOD_ABS Module Absent. Grounded within the module 4 7 RS0 Rate Select 0 5 8 LOS Loss of Signal indication. Logic 0 indicates normal operation. 6

5. All contents are Copyright © 1996 - 20 1 9 Wavesplitter Technologies, Inc. All rights reserved. Preliminary and Proprietary www.wavesplitter.com Page 5 of 9 Document Number: 95 - 0240 - V 1 .1 2 5Gb/s LAN - WDM SFP 28 4 0km Transceive r ( Preliminary ) WST - S28 - LM4Hxx - I 9 RS1 No connection required 1 10 V EER Receiver Ground (Common with Transmitter Ground) 1 11 V EER Receiver Ground (Common with Transmitter Ground) 1 12 RD - Receiver Inverted DATA out. AC Coupled 13 RD+ Receiver Non - inverted DATA out. AC Coupled 14 V EER Receiver Ground (Common with Transmitter Ground) 1 15 V CCR Receiver Power Supply 16 V CCT Transmitter Power Supply 17 V EET Transmitter Ground (Common with Receiver Ground) 1 18 TD+ Transmitter Non - Inverted DATA in. AC Coupled. 19 TD - Transmitter Inverted DATA in. AC Coupled. 20 V EET Transmitter Ground (Common with Receiver Ground) 1 Notes: 1. Circuit ground is internally isolated from chassis ground. 2. T FAULT is an open collector/drain output, which should be pulled up with a 4.7k – 10k Ohms resistor on the host board if intended for use. Pull up voltage should be between 2.0V to Vcc + 0.3V.A high output indicates a transmitter fault caused by either the TX bias current or the TX output power exceeding the preset alarm threshold. A low output indicates normal operation. In the low state, the output is pulled to <0.8V. 3. Laser outp ut disabled on T DIS >2.0V or open, enabled on T DIS <0.8V. 4. Should be pulled up with 4.7kΩ - 10kΩ host board to a voltage between 2.0V and 3.6V. MOD_ABS pulls line low to indicate module is plugged in. 5. Internally pulled down per SFF - 8431 Rev 4.1. 6. L OS is open collector output . I t s hould be pulled up with 4.7kΩ – 10kΩ on host board to a voltage between 2.0V and 3.6V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.

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 2 5Gb/s LAN - WDM SFP 28 4 0km Transceive r ( Preliminary ) High Power Budget 23dB P/N: WST - S28 - LM4Hxx - I Abs o lute Maximum Ratings Parameter Symbol Min. Typ. Max. Unit Note Storage Temperature Ts - 40 - 85 ºC Relative Humidity RH 5 - 95 % Power Supply Voltage VCC - 0.3 - 4 V Receive Input Optical Power (Damage threshold) Pdmg 3 .5 dBm Features: ◼ Supports 24. 3Gb/s to 26.5 Gb/s bit rates ◼ Up to 40km transmission on SMF ◼ EML L aser and APD receiver ◼ Metal enclosure, for lower EMI ◼ 2 - wire interface with integrated Digital Diagnostic monitoring ◼ S pecifications compliant with SFF 8472 ◼ Compliant with SFP+ MSA with LC connector ◼ Single 3.3V power supply ◼ Power dissipation < 1.8 W ◼ Case o perating temperature range: Industrial : - 4 0 °C to + 85 °C ◼ Applications: ⚫ 25 G Ethernet ⚫ CPRI 10 S tandard : ⚫ Compliant to SFF - 8431 ⚫ Compliant to SFF 8472 ⚫ Compliant to IEEE 802.3 CC ⚫ RoHS Compliant .

2. All contents are Copyright © 1996 - 20 1 9 Wavesplitter Technologies, Inc. All rights reserved. Preliminary and Proprietary www.wavesplitter.com Page 2 of 9 Document Number: 95 - 0240 - V 1 .1 2 5Gb/s LAN - WDM SFP 28 4 0km Transceive r ( Preliminary ) WST - S28 - LM4Hxx - I Re co mmended O perating Co nditi o ns Parameter Symbol Min. Typ. Max. Unit Note Case Operating Temperature Tcase - 4 0 85 ºC Industrial Power Supply Voltage VCC 3.14 3.3 3.47 V Power Supply Current ICC 500 mA commercial 550 mA Industrial Data Rate BR 24.3 25.78 26.5 Gbps Transmission Distance TD - 40 km Coupled fiber Single mode fiber 9/125um SMF E lectrical C haracteristics Parameter Symbol Min Typ Max Unit NOTE Supply Voltage Vcc 3.14 3.3 3.46 V Supply Current Icc 500 mA commercial Transmitter Input differential impedance Rin 100 Ω 1 Differential data input swing Vin,pp 300 800 mV Transmit Disable Voltage VD 2.0 Vcc+0.3 V Transmit Enable Voltage VEN - 0.3 0.8 V 2 Receiver Differential data output swing Vout,pp 500 900 mV 3 LOS Fault VLOS fault 2.4 Vcc+0.3 V 4 LOS Normal VLOS norm - 0.3 0.4 V 4 Notes: 1. Connected directly to TX data input pins. AC coupled thereafter. 2. Or open circuit. 3. Into 100 ohms differential termination. 4. Loss o f Signal is LVTTL. Logic 0 indicates normal operation; logic 1 indicates no signal detected.

3. All contents are Copyright © 1996 - 20 1 9 Wavesplitter Technologies, Inc. All rights reserved. Preliminary and Proprietary www.wavesplitter.com Page 3 of 9 Document Number: 95 - 0240 - V 1 .1 2 5Gb/s LAN - WDM SFP 28 4 0km Transceive r ( Preliminary ) WST - S28 - LM4Hxx - I Optical Characteristics Parameter Symbol Min Typ Max Unit NOTE Transmitter Output Opt. Power POUT +4 +8 dBm 1 Optical Wavelength ( 2 ) λ 1272.55 1273.54 1274.54 nm WST - S28 - LM4H73 - I 1276.89 1277.89 1278.89 nm WST - S28 - LM4H77 - I 1281.25 1282.26 1283.27 nm WST - S28 - LM4H82 - I 1285.65 1286.66 1287.68 nm WST - S28 - LM4H86 - I 1290.09 1291.10 1292.13 nm WST - S28 - LM4H91 - I 1294.53 1295.56 1296.59 nm WST - S28 - LM4H95 - I 1299.02 1300.05 1301.09 nm WST - S28 - LM4H00 - I 1303.54 1304.58 1305.63 nm WST - S28 - LM4H04 - I 1308.09 1309.14 1310.19 nm WST - S28 - LM4H09 - I Spectral Width ( - 20dB) σ 1 nm Side - mode suppression ratio SMSR 30 dB Optical Extinction Ratio ER 4 dB Power off Tx disable POFF - 30 dBm 1 Transmitter reflection - 12 dB RIN ( OMA ) - 130 dB/Hz Transmitter eye mask {0.31,0.4,0.45,0.34,0.38,0.4} Receiver Rx Sensitivity RSENS - 19.0 dBm 3 ,4 Input Saturation Power (Overload) Psat - 5 dBm Receiver reflection - 26 dBm Wavelength Range λ C 1260 1310 1355 nm LOS De - Assert LOSD - 20 dBm LOS Assert LOSA - 38 dBm LOS Hysteresis 0.5 dB

9. Page 9 of 9 Document Number: 95 - 0240 - V 1 .1 2 5Gb/s LAN - WDM SFP 28 4 0km Transceive r ( Preliminary ) WST - S28 - LM4Hxx - I Orderi n g I n f o rmation Part No Specification Package Data rate per Lane Laser Optical Power Detector Max. Receive Sensitivity (OMA) Temp Reach Other Application code WST - S28 - LM4H73 - I SFP28 25.78 Gb p s each Channel 1 273.54 EML +4 ~ + 8 each Channel PIN - 19 dBm each Channel - 4 0 ~ 85 °C 4 0 k m DDM RoHS 25 G Ethernet WST - S28 - LM4H77 - I SFP28 25.78 Gb p s each Channel 1 277.89 EML +4 ~ + 8 each Channel PIN - 19 dBm each Channel - 40 ~ 85°C 4 0 k m DDM RoHS 25 G Ethernet WST - S28 - LM4H82 - I SFP28 25.78 Gb p s each Channel 1 282.26 EML +4 ~ + 8 each Channel PIN - 19 dBm each Channel - 40 ~ 85°C 4 0 k m DDM RoHS 25 G Ethernet WST - S28 - LM4H86 - I SFP28 25.78 Gb p s each Channel 1286.66 EML +4 ~ + 8 each Channel PIN - 19 dBm each Channel - 40 ~ 85°C 4 0 k m DDM RoHS 25 G Ethernet WST - S28 - LM4H91 - I SFP28 25.78 Gb p s each Channel 1291.10 EML +4 ~ + 8 each Channel PIN - 19 dBm each Channel - 40 ~ 85°C 4 0 k m DDM RoHS 25 G Ethernet WST - S28 - LM4H95 - I SFP28 25.78 Gb p s each Channel 1295.56 EML +4 ~ + 8 each Channel PIN - 19 dBm each Channel - 40 ~ 85°C 4 0 k m DDM RoHS 25 G Ethernet WST - S28 - LM4H00 - I SFP28 25.78 Gb p s each Channel 1300.05 EML +4 ~ + 8 each Channel PIN - 19 dBm each Channel - 40 ~ 85°C 4 0 k m DDM RoHS 25 G Ethernet WST - S28 - LM4H04 - I SFP28 25.78 Gb p s each Channel 1304.58 EML +4 ~ + 8 each Channel PIN - 19 dBm each Channel - 40 ~ 85°C 4 0 k m DDM RoHS 25 G Ethernet WST - S28 - LM4H09 - I SFP28 25.78 Gb p s each Channel 1309.14 EML +4 ~ + 8 each Channel PIN - 19 dBm each Channel - 40 ~ 85°C 4 0 k m DDM RoHS 25 G Ethernet Modification History Revision Date Description Originator Review Approved V 1. 0 30 - Jun - 20 1 9 New Issue for Preliminary Ivy Chen Wayne Liao Wayne Liao V 1.1 4 - Oct - 20 1 9 New Issue for Preliminary Ivy Chen Wayne Liao Wayne Liao All specification data are accurate on the date of publication for product comparisons 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 ShenZhen Branch 610#, 6F, No.204 Building, 2nd Industrial zone Nanyou, Nanshan district, Shenzhen, Guangdong China 518054 Tel: +86 - 755 - 86265980 Fax: +86 - 755 - 26642741

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