Optoway XPS-2385MW-DXXXG 1 *********************************************************************************************************************************************************************** XPS-2385MW-DXXXG (RoHS Compliant) 10G Multirate / 80 km / 50 GHz DWDM XFP Single-Mode Optical Transceiver ********************************************************************************************************************************************************************** FEATURES DESCRIPTION l l l l l l l XPS-2385MW-DXXXG series DWDM transceiver is designed for single-mode fibre serial optical data communications such as 10G SONET/SDH, 10GBASE-ZR/ZW Ethernet and 10G Fibre Channel. This module is designed for single mode fiber and operates at a nominal wavelength of 50GHz ITU Grid, C Band DWDM wavelength. The transmitter section consists of a temperature-stabilized DWDM electrical-modulated laser (EML), driver and signal conditioner. The receiver section incorporates an avalanche photodiode integrated with a trans-impedance preamplifier (TIA) and signal conditioner. The module is with the XFP 30-pin connector to allow hot plug capability. Integrated Tx and Rx signal conditioners provide high jitter-tolerance for full XFI compliance and no external reference clock required. The internally ac coupled high speed serial I/O simplifies interfacing to external circuitry. Dual 5V and 3.3V power supply are used. The optical output can be disabled by LVTTL logic high-level input of TX_DIS. Loss of signal (RX_LOS) output is provided to indicate the loss of an input optical signal of receiver. A serial EEPROM in the transceiver allows the user to access transceiver digital diagnostic monitoring and configuration data via the 2-wire XFP Management Interface. This interface uses a single address, A0h, with a memory map divided into a lower and upper area. Basic digital diagnostic data is held in the lower area while specific data is held in a series of tables in the high memory area. l l l l l l Supports 9.95 Gbps to 11.1Gbps Complaint with XFP MSA Compliant with XFI 10G Serial Electrical Interface Maximum Link Length of 80 km Temperature-stabilized DWDM EML Transmitter 50 GHz ITU Grid, C Band 2-Wire Interface for Integrated Digital Diagnostic Monitoring XFI Loopback Mode No reference Clock required Power Dissipation < 3.5 W Dual 5V and +3.3 V Power Supply RoHS-6 Compliant -5 to 70oC Case Operating Temperature APPLICATIONS l l l l l DWDM 10Gb/s SONET/SDH ITU-T G.698.1 DWDM 10 Gb/s SONET/SDH with ITU-T G.709 DWDM 80km 10G Etherent DWDM 80km 10G Fibre Channel DWDM 80km 10G Ethernet with FEC LASER SAFETY This single-mode transceiver is a Class 1 laser product. It complies with IEC-60825 and FDA 21 CFR 1040.10 and 1040.11. The transceiver must be operated within the specified temperature and voltage limits. The optical ports of the module shall be terminated with an optical connector or with a dust plug. ********************************************************************************************************************************************************************** OPTOWAY TECHNOLOGY INC. No.38, Kuang Fu S. Road, Hu Kou, Hsin Chu Industrial Park, Hsin Chu, Taiwan 303 Tel: 886-3-5979798 E-mail: [email protected] Fax: 886-3-5979737 http: // www.optoway.com.tw 9/1/2012 V2.0 Optoway XPS-2385MW-DXXXG 2 *********************************************************************************************************************************************************************** ORDER INFORMATION P/No. Bit Rate (Gb/s) 10G XPS-2385MW-DXXXG 10G Multirate* ER / EW Distance (km) 80 Spacing (GHz) 50 Wavelength Package Case Temp RoHS (nm) (oC) Compliant DWDM* XFP with DMI -5 to 70 Yes *: multirate for SONET OC-192 LR-2, 10GBASE-ZR/ZW, 10G Fibre Channel, ITU-T G.709, 10GBASE-ZR/ZW + FEC. *: XXX: 50GHz ITU Grid wavelength (Please see below) Channel # 200 205 210 215 220 225 230 235 240 245 250 255 260 265 270 275 280 285 290 295 300 305 310 315 320 325 330 335 340 345 350 355 360 365 370 375 380 385 390 395 400 405 410 415 420 425 430 435 440 445 Product code XPS-2385MW-D200G XPS-2385MW-D205G XPS-2385MW-D210G XPS-2385MW-D215G XPS-2385MW-D220G XPS-2385MW-D225G XPS-2385MW-D230G XPS-2385MW-D235G XPS-2385MW-D240G XPS-2385MW-D245G XPS-2385MW-D250G XPS-2385MW-D255G XPS-2385MW-D260G XPS-2385MW-D265G XPS-2385MW-D270G XPS-2385MW-D275G XPS-2385MW-D280G XPS-2385MW-D285G XPS-2385MW-D290G XPS-2385MW-D295G XPS-2385MW-D300G XPS-2385MW-D305G XPS-2385MW-D310G XPS-2385MW-D315G XPS-2385MW-D320G XPS-2385MW-D325G XPS-2385MW-D330G XPS-2385MW-D335G XPS-2385MW-D340G XPS-2385MW-D345G XPS-2385MW-D350G XPS-2385MW-D355G XPS-2385MW-D360G XPS-2385MW-D365G XPS-2385MW-D370G XPS-2385MW-D375G XPS-2385MW-D380G XPS-2385MW-D385G XPS-2385MW-D390G XPS-2385MW-D395G XPS-2385MW-D400G XPS-2385MW-D405G XPS-2385MW-D410G XPS-2385MW-D415G XPS-2385MW-D420G XPS-2385MW-D425G XPS-2385MW-D430G XPS-2385MW-D435G XPS-2385MW-D440G XPS-2385MW-D445G Frequency (THz) 192.00 192.05 192.10 192.15 192.20 192.25 192.30 192.35 192.40 192.45 192.50 192.55 192.60 192.65 192.70 192.75 192.80 192.85 192.90 192.95 193.00 193.05 193.10 193.15 193.20 193.25 193.30 193.35 193.40 193.45 193.50 193.55 193.60 193.65 193.70 193.75 193.80 193.85 193.90 193.95 194.00 194.05 194.10 194.15 194.20 194.25 194.30 194.35 194.40 194.45 Center Wavelength (nm) 1561.42 1561.01 1560.61 1560.20 1559.79 1559.39 1558.98 1558.58 1558.17 1557.77 1557.36 1556.96 1556.55 1556.15 1555.75 1555.34 1554.94 1554.54 1554.13 1553.73 1553.33 1552.93 1552.52 1552.12 1551.72 1551.32 1550.92 1550.52 1550.12 1549.72 1549.32 1548.91 1548.51 1548.11 1547.72 1547.32 1546.92 1546.52 1546.12 1545.72 1545.32 1544.92 1544.53 1544.13 1543.73 1543.33 1542.94 1542.54 1542.14 1541.75 Label 200 205 210 215 220 225 230 235 240 245 250 255 260 265 270 275 280 285 290 295 300 305 310 315 320 325 330 335 340 345 350 355 360 365 370 375 380 385 390 395 400 405 410 415 420 425 430 435 440 445 ********************************************************************************************************************************************************************** OPTOWAY TECHNOLOGY INC. No.38, Kuang Fu S. Road, Hu Kou, Hsin Chu Industrial Park, Hsin Chu, Taiwan 303 Tel: 886-3-5979798 E-mail: [email protected] Fax: 886-3-5979737 http: // www.optoway.com.tw 9/1/2012 V2.0 Optoway XPS-2385MW-DXXXG 3 *********************************************************************************************************************************************************************** Channel # 450 455 460 465 470 475 480 485 490 495 500 505 510 515 520 525 530 535 540 545 550 555 560 565 570 575 580 585 590 595 600 Product code XPS-2385MW-D450G XPS-2385MW-D455G XPS-2385MW-D460G XPS-2385MW-D465G XPS-2385MW-D470G XPS-2385MW-D475G XPS-2385MW-D480G XPS-2385MW-D485G XPS-2385MW-D490G XPS-2385MW-D495G XPS-2385MW-D500G XPS-2385MW-D505G XPS-2385MW-D510G XPS-2385MW-D515G XPS-2385MW-D520G XPS-2385MW-D525G XPS-2385MW-D530G XPS-2385MW-D535G XPS-2385MW-D540G XPS-2385MW-D545G XPS-2385MW-D550G XPS-2385MW-D555G XPS-2385MW-D560G XPS-2385MW-D565G XPS-2385MW-D570G XPS-2385MW-D575G XPS-2385MW-D580G XPS-2385MW-D585G XPS-2385MW-D590G XPS-2385MW-D595G XPS-2385MW-D600G Frequency (THz) 194.50 194.55 194.60 194.65 194.70 194.75 194.80 194.85 194.90 194.95 195.00 195.05 195.10 195.15 195.20 195.25 195.30 195.35 195.40 195.45 195.50 195.55 195.60 195.65 195.70 195.75 195.80 195.85 195.90 195.95 196.00 Center Wavelength (nm) 1541.35 1540.95 1540.56 1540.16 1539.77 1539.37 1538.98 1538.58 1538.19 1537.79 1537.40 1537.00 1536.61 1536.22 1535.82 1535.43 1535.04 1534.64 1534.25 1533.86 1533.47 1533.07 1532.68 1532.29 1531.90 1531.51 1531.12 1530.72 1530.33 1529.94 1529.55 Label 450 455 460 465 470 475 480 485 490 495 500 505 510 515 520 525 530 535 540 545 550 555 560 565 570 575 580 585 590 595 600 ********************************************************************************************************************************************************************** OPTOWAY TECHNOLOGY INC. No.38, Kuang Fu S. Road, Hu Kou, Hsin Chu Industrial Park, Hsin Chu, Taiwan 303 Tel: 886-3-5979798 E-mail: [email protected] Fax: 886-3-5979737 http: // www.optoway.com.tw 9/1/2012 V2.0 Optoway XPS-2385MW-DXXXG 4 *********************************************************************************************************************************************************************** Absolute Maximum Ratings Parameter Storage Temperature Operating Case Temperature Relative Humidity Power Supply Voltage (5V) Power Supply Voltage (3.3V) Receiver Input Optical Power Symbol Tstg Topr RH Vcc5 VCC3 Mip Min -40 -5 0 -0.5 -0.5 Max 85 70 85 6.0 3.6 4 Units o C o C % V V dBm Notes Non condensing Received average power Recommended Operating Conditions Parameter Symbol Min Typ VCC5 Power Supply Voltage (5V) 4.75 5 VCC3 Power Supply Voltage (3.3V) 3.13 3.3 ICC5 Power Supply Current (@5V) ICC3 Power Supply Current (@3.3V) Power Dissipation PD Operating Case Temperature Topr -5 Data Rate 9.95 10.3125 1. Including in rush current. Maximum module current ramp rate is 100 mA/µs. Max 5.25 3.47 300 750 3.5 70 11.1 Units / Notes V V mA / 1 mA / 1 W o C Gb/s Transmitter Optical Specifications (Topr= -5 to 70oC, Vcc5=5V±5%, Vcc3 = 3.3V ±5%) Parameter Average Launch Power Extinction Ratio Center Wavelength Spacing Transmitter Center Wavelength -- over life time Output Spectrum Width Side Mode Suppression Ratio Transmitter and Dispersion Penalty @ -500 to 1600 ps/nm Relative Intensity Noise Eye Mask 1 Eye Mask 2 Average Launch Power of OFF Transmitter Symbol Po, Avg ER Min 0 8.2 λc X-60 σλ SMSR TDP 30 RIN Typ 50 X Max +4 X+60 Units dBm dB GHz pm 1 nm dB dB 3 -130 IEEE 802.3ae GR-253-CORE / ITU-T G.691 -30 Notes 2 3 -20 dB width dB/Hz 10G Ethernet 10G SONET dBm 2. Output power is power coupled into a 9/125 µm single-mode fiber. 3. X = specified ITU Grid wavelength. Wavelength stability is achieved within 60 seconds of power up. Receiver Optical Specifications (Topr= -5 to 70oC, Vcc5=5V±5%,Vcc3 = 3.3V ±5%) Parameter Sensitivity Receiver Overload LOS -- Deasserted LOS -- Asserted LOS -- Hysteresis Wavelength of Operation Optical Return Loss Symbol Sen1 Sen2 PMAX LOSD LOSA λc ORL Min Typ -7 ---36 0.5 1260 --------- Max -24 -22 -28 --1620 -27 Units dBm dBm dBm dBm dB nm dB Notes 4 / at 9.95 Gb/s 4 / at 11.1 Gb/s Transition: low to high Transition: high to low 4. Measured with worst ER; BER < 10-12 and PRBS 231-1. ********************************************************************************************************************************************************************** OPTOWAY TECHNOLOGY INC. No.38, Kuang Fu S. Road, Hu Kou, Hsin Chu Industrial Park, Hsin Chu, Taiwan 303 Tel: 886-3-5979798 E-mail: [email protected] Fax: 886-3-5979737 http: // www.optoway.com.tw 9/1/2012 V2.0 Optoway XPS-2385MW-DXXXG 5 *********************************************************************************************************************************************************************** Electrical Characteristics Parameter Symbol Min Typ Max High-Speed Signal (CML) Interface Specification Input Data Rate 9.95 10.3125 11.1 Differential Input Impedance Rin 100 Differential Data Input Amplitude 120 820 Output Data Rate 9.95 10.3125 11.1 Differential Output Impedance Rout 100 Differential Data Output 340 650 850 Amplitude Low-Speed Signal (LVTTL) Interface Specification Input High Voltage 2.0 Vcc Input Low Voltage GND 0.8 Output High Voltage 2.4 Vcc Output Low Voltage GND 0.5 Reference Clock (LVPECL) Interface Specification No reference clock required. Units Notes Gb/s Ω mVpp Gb/s Ω mVpp 6 7, Internally AC coupled 6 7, Internally AC coupled V V V V 6. 10GBASE-ER/EW and 10G Fibre Channel. 7. The differential input and output amplitudes are per XFP MSA mask at points B’ and C’. Transceiver Timing Characteristics Parameter TX_DIS Assert Time TX_DIS Negate Time Time to Initialize Interrupt Assert Delay Interrupt Negate Delay P_Down/PST Assert Delay P_Down Nagate Delay Mod_NR Assert Delay Mod_NR Negate Delay Mod_Desel Assert Time Mod_Desel De-Assert Time P_Down Reset Time RX_LOS Assert Delay RX_LOS Negate Delay Serial ID Clock Rate Symbol t_off t_on t_init interrupt_on interrupt_off P_Down/RST_on P_Down/RST_off Mod_nr_on Mod_nr_off T_Mod_Desel T_Mod_Sel T_reset T_Los_on T_Los_off fSCL Min Typ Max 10 2 300 200 500 100 300 1 1 2 2 10 0 100 100 400 Units µs ms ms ms µs µs ms ms ms ms ms µs µs µs kHz Notes ********************************************************************************************************************************************************************** OPTOWAY TECHNOLOGY INC. No.38, Kuang Fu S. Road, Hu Kou, Hsin Chu Industrial Park, Hsin Chu, Taiwan 303 Tel: 886-3-5979798 E-mail: [email protected] Fax: 886-3-5979737 http: // www.optoway.com.tw 9/1/2012 V2.0 Optoway XPS-2385MW-DXXXG 6 *********************************************************************************************************************************************************************** MANAGEMENT INTERFACE The structure of the memory map is shown in Figure 1, which is accessible over a 2-wire serial interface at the 8-bit address 1010000X (A0h). The normal 256 byte I2C address space is divided into low and upper blocks of 128 Bytes. The lower block of 128 Bytes is always directly available and is used for the diagnostics and control function. Multiple blocks of memories are available in the upper 128 Bytes of the address space. These are individually addressed through a table select Byte which the user enters into a location in the lower address space. Thus, there is a total available address space of 128*256 = 32 Kbytes in this upper memory space. The contents of Table 01h are listed in Table 1 below. Please refer SFF INF-8077i (Revision 4.5) for detailed information. Figure 1. 2-wire Serial Digital Diagnostic Memory Map Data Address 96 ~ 97 98 ~ 99 100 ~ 101 102 ~ 103 104 ~ 105 106 ~ 107 Table 1 Monitoring Specification Parameter Accuracy ± 3oC Temperature Reserved ± 10% ± 2dB ± 2dB ± 3% Tx Bias Tx Power Rx Power Vcc3 ********************************************************************************************************************************************************************** OPTOWAY TECHNOLOGY INC. No.38, Kuang Fu S. Road, Hu Kou, Hsin Chu Industrial Park, Hsin Chu, Taiwan 303 Tel: 886-3-5979798 E-mail: [email protected] Fax: 886-3-5979737 http: // www.optoway.com.tw 9/1/2012 V2.0 Optoway XPS-2385MW-DXXXG 7 *********************************************************************************************************************************************************************** CONNECTION DIAGRAM Table 3 PIN Description PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Logic LVTTL-I LVTTL-O LVTTL-I LVTTL-I/O LVTTL-I/O LVTTL-O LVTTL-O LVTTL-O CML-O CML-O Signal Name GND VEE5 Mod_Desel Interrupt TX_DIS VCC5 GND VCC3 VCC3 SCL SDA Mod_Abs Mod_NR RX_LOS GND GND RDRD+ GND VCC2 Description Note Module Ground -5.2V Power Supply (Not required) Module De-select; When held low allows module to respond to 2-wire serial interface Interrupt; Indicates presence of an important condition which can be read over the 2wire serial interface Transmitter Disable; Turns off transmitter laser output +5V Power Supply Module Ground +3.3V Power Supply +3.3V Power Supply Serial 2-wire interface clock Serial 2-wire interface data line Indicates Module is not present. Grounded in the Module Module Not Ready; Indicating Module Operational Fault Receiver Loss Of Signal Indicator Module Ground Module Ground Receiver Inverted Data Output Receiver Non-Inverted Data Output Module Ground +1.8V Power Supply (Not required) 1 3 2 3 1 2 2 2 2 2 1 1 1 3 ********************************************************************************************************************************************************************** OPTOWAY TECHNOLOGY INC. No.38, Kuang Fu S. Road, Hu Kou, Hsin Chu Industrial Park, Hsin Chu, Taiwan 303 Tel: 886-3-5979798 E-mail: [email protected] Fax: 886-3-5979737 http: // www.optoway.com.tw 9/1/2012 V2.0 Optoway XPS-2385MW-DXXXG 8 *********************************************************************************************************************************************************************** 21 LVTTL-I P_Down/RST 22 23 24 PECL-I VCC2 GND RefCLK+ 25 PECL-I RefCLK- 26 27 28 CML-I 29 CML-I 30 GND GND TDTD+ GND Power down; When high, requires the module to limit power consumption to 1.5W or below. 2-Wire serial interface must be functional in the low power mode. Reset; The falling edge initiates a complete reset of the module including the 2-wire serial interface, equivalent to a power cycle. +1.8V Power Supply (Not required) Module Ground Reference Clock Non-Inverted Input, AC coupled on the host board. (Not used. Internally terminated to 50 ohm (100 ohm diff.)) Reference Clock Inverted Input, AC coupled on the host board. (Not used. Internally terminated to 50 ohm (100 ohm diff.)) Module Ground Module Ground Transmitter Inverted Data Input Transmitter Non-Inverted Data Input Module Ground 3 1 4 4 1 1 1 1. Module ground pins GND are isolated from the module case and chassis ground within the module. 2. Shall be pulled up with 4.7K-10Kohms to a voltage between 3.15V and 3.45V on the host board. 3. These PINs are open within module. 4. A Reference Clock input is not required. If present, it will be ignored. MECHANICAL SPECIFICATION (UNITS IN MM) ********************************************************************************************************************************************************************** OPTOWAY TECHNOLOGY INC. No.38, Kuang Fu S. Road, Hu Kou, Hsin Chu Industrial Park, Hsin Chu, Taiwan 303 Tel: 886-3-5979798 E-mail: [email protected] Fax: 886-3-5979737 http: // www.optoway.com.tw 9/1/2012 V2.0 Optoway XPS-2385MW-DXXXG 9 *********************************************************************************************************************************************************************** RECOMMENDED POWER CIRCUIT SCHEMATIC Host Board VCC5 Optional Host +5V 4.7μH 0.1μF VCC3 Host +3.3V 4.7μH 22μF 0.1μF 0.1μF VCC2 Optional Host +1.8V 4.7μH 22μF 0.1μF XFP Connector 22μF 0.1μF XFP Module 0.1μF VEE5 Optional Host -5.2V 4.7μH 0.1μF 22μF 0.1μF RECOMMENDED INTERFACE CIRCUIT XFP module Host Board SerDat Out+ TD + Z=50Ω CML 100Ω CML TD - SerDat OutZ=50Ω SerDat In+ CML RD + Z=50Ω 100Ω CML SerDat In- RD Z=50Ω Vcc(+3.3V) REFCLKP 100Ω 4.7K to 10KΩ REFCLKN RX_LOS INTERRUPT SDA VCC(+3.3V) SCL MOD_NR 10KΩ MOD_abs TX_DIS GND MOD_DeSel P_Down/RST ********************************************************************************************************************************************************************** OPTOWAY TECHNOLOGY INC. No.38, Kuang Fu S. Road, Hu Kou, Hsin Chu Industrial Park, Hsin Chu, Taiwan 303 Tel: 886-3-5979798 E-mail: [email protected] Fax: 886-3-5979737 http: // www.optoway.com.tw 9/1/2012 V2.0 Optoway XPS-2385MW-DXXXG 10 *********************************************************************************************************************************************************************** Table 2 Serial ID Memory Contents (Table 01h) Address Field Size (Byte) 128 1 Identifier 129 130 1 1 Ext. Identifier Connector type 131~138 139 140 141 142 143 144 145 146 147 8 1 1 1 1 1 1 1 1 1 Transceiver Encoding BR-Min BR-Max length (SMF)-Km Length (E-50µm) Length (50 µm) Length (62.5 µm) Length (Copper) Device Tech 148~163 164 165~167 16 1 3 Vendor name CDR Support Vendor OUI 168~183 184~185 186~187 16 2 2 188~189 190 191 2 1 1 Vendor PN Vendor rev Wavelength Wavelength Tolerance Max Case Temp CC_BASE 192~195 4 Power Supply 196~211 16 Vendor SN 212~219 8 220 1 Date code Diagnostic Monitoring Type 221 222 223 224~255 1 1 1 32 Enhanced Options Aux Monitoring CC_EXT Vendor Specific Name of Filed Description Hex XFP power consumption < 3.5W, no Ref Colck required LC connector 10GBASE-ZR/ZW, 10GFC 1200-SM-LL-V 10G SONET/SDH 64B/66B, 8B10B, SONET Scrambled & NRZ 9.9Gbps 11.1Gbps 80 Km 0m 0m 0m 0m DWDM EML, APD detector 06 +/- 0.06nm 70deg Check sum of Byte 128 -- 190 3.5 Wmax, 1.5W pd_max , 750mA 3.3V, 500 mA 5V 00 0C 46 90 07 22 20 00 00 00 00 00 00 F0 63 6F 50 00 00 00 00 76 4F 50 54 4F 57 41 59 20 OPTOWAY 20 20 20 20 20 20 20 20 CDR supports 9.953G ~ 11.1G & XFI Loopback F9 00 0E FA 58 50 53 2D 32 33 38 35 XPS-2385MW-DXXXG 4D 57 2D 44 3X 3X 3X 47 ASCII (“31 61” means 1a revision) xx xx 1XXX.XXnm xx xx ASCII ASCII Year (2 Byte), Month (2 Byte), Day (2 Byte) No BER Support, Average Power Optional Soft TX_DISABLE implemented, Optional Soft P_down implemented AUX1 for Vcc3, AUX2 for Vcc5. Check sum of Byte 192 -- 222 AF 96 A8 00 xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx xx 20 20 08 60 76 Reserved Note: Specifications subject to change without notice. ********************************************************************************************************************************************************************** OPTOWAY TECHNOLOGY INC. No.38, Kuang Fu S. Road, Hu Kou, Hsin Chu Industrial Park, Hsin Chu, Taiwan 303 Tel: 886-3-5979798 E-mail: [email protected] Fax: 886-3-5979737 http: // www.optoway.com.tw 9/1/2012 V2.0 Optoway XPS-2385MW-DXXXG 11 *********************************************************************************************************************************************************************** REVISION HISTORY Version 1.0 2.0 Subject Release Date Initial datasheet Change the TX wavelength stability to +/- 60 pm 2010/7/1 2012/9/1 ********************************************************************************************************************************************************************** OPTOWAY TECHNOLOGY INC. No.38, Kuang Fu S. Road, Hu Kou, Hsin Chu Industrial Park, Hsin Chu, Taiwan 303 Tel: 886-3-5979798 E-mail: [email protected] Fax: 886-3-5979737 http: // www.optoway.com.tw 9/1/2012 V2.0