Product Specification 1000BASE-T COPPER SFP Optical Transceiver FCLF-8520/8521-3 PRODUCT FEATURES  Up to 1.25Gb/s bi-directional data links  Hot-pluggable SFP footprint  Extended case temperature range -0°C to +85°C  Fully metallic enclosure for low EMI  Low power dissipation (1.05W typical)  Compact RJ-45 connector assembly  RoHS-6 compliant (lead-free) APPLICATIONS  Access to physical layer IC via 2-wire serial bus  1.25 Gigabit Ethernet  10/100/1000 BASE-T operation in host over Cat 5 cable systems with SGMII interface Finisar’s FCLF-8520/8521-3 1000BASE-T Copper Small Form Pluggable (SFP) transceivers are based on the SFP Multi Source Agreement (MSA)1. They are compatible with the Gigabit Ethernet and 1000BASE-T standards as specified in IEEE Std 802.32. The 1000BASE-T physical layer IC (PHY) can be accessed via I2C, allowing access to all PHY settings and features. The FCLF-8520-3 uses the SFP’s RX_LOS pin for link indication, and 1000BASE-X auto- negotiation should be disabled on the host system. The FCLF-8521-3 is compatible with 1000BASE-X auto-negotiation, but does not have a link indication feature (RX_LOS is internally grounded). See AN-2036 (“Frequently Asked Questions Regarding Finisar’s 1000BASE-T SFPs”) for a more complete explanation on the differences between the two models and details on applications issues for the products. The optical transceiver is compliant per the RoHS Directive 2011/65/EU. See Finisar Application Note AN-2038 for more details5,6.  PRODUCT SELECTION Part Number Link IndicatoronRX_LOSPin 1000BASE-X auto-negotiation enabled by default FCLF-8520-3 Yes No FCLF-8521-3 No Yes  Finisar Corporation – August 2015 Rev. E1 Page 1

FCLF-8520/8521-3 Product Specification   I. SFP to Host Connector Pin Out   Pin Symbol Name/Description Note 1 VEET Transmitter ground (common with receiver ground) 1 2 TFAULT Transmitter Fault. Not supported 3 TDIS Transmitter Disable. PHY 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 8 LOS Loss of Signal indication. 4 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- Receiver Inverted DATA out. AC coupled 13 RD+ Receiver Non-inverted DATA out. AC coupled 14 VEER Receiver ground (common with transmitter ground) 1 15 VCCR Receiver power supply 16 VCCT Transmitter power supply 17 VEET 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 VEET Transmitter ground (common with receiver ground) 1 Notes: 1. Circuit ground is connected to chassis ground 2. PHY disabled on T > 2.0V or open, enabled on T < 0.8V DIS DIS 3. Should be pulled up with 4.7k – 10k Ohms on host board to a voltage between 2.0 V and 3.6 V. MOD_DEF(0) pulls line low to indicate module is plugged in. 4. LVTTL compatible with a maximum voltage of 2.5V. Not supported on FCLF-8521-3. Table 1. SFP to host connector pin assignments and descriptions               VeeT 20     1 VeeT         TD- 19     2 TXFault          3 TX Disable TVDee+T 1 187      4 MOD-DEF(2)         VccT 16   Towards 5 MOD-DEF(1)   Towards   VccR 15 Bezel 6 MOD-DEF(0)   ASIC   VeeR 14 7 Rate Select     RD+ 13 8 LOS     RD- 12 9 VeeR     VeeR 11 10 VeeR       Figure 1. Diagram of host board connector block pin numbers and names  Finisar Corporation – August 2015 Rev. E1 Page 2

FCLF-8520/8521-3 Product Specification II. +3.3V Volt Electrical Power Interface   The FCLF-8520/8521-3 has an input voltage range of 3.3 V +/- 5%. The 4 V maximum voltage is not allowed for continuous operation.     +3.3 Volt Electrical Power Interface Parameter Symbol Min Typ Max Units Notes/Conditions Supply Current Is   320 375 mA 1.2W max power over full range of voltage and temperature. See caution note below Input Voltage V 3.13 3.3 3.47 V Referenced to GND cc Maximum Voltage Vmax     4 V   Surge Current Isurge     30 mA Hot plug above steady state current. See caution note below Caution: Power consumption and surge current are higher than the specified values in the SFP MSA Table 2. +3.3 Volt electrical power interface       III. Low-Speed Signals   MOD_DEF(1) (SCL) and MOD_DEF(2) (SDA), are open drain CMOS signals (see section VII, “Serial Communication Protocol”). Both MOD_DEF(1) and MOD_DEF(2) must be pulled up to host_Vcc.       Low-Speed Signals, Electronic Characteristics Parameter Symbol Min Max Units Notes/Conditions SFP Output LOW V 0 0.5 V 4.7k to 10k pull-up to host_Vcc, OL measured at host side of connector SFP Output HIGH V host_Vcc - 0.5 host_Vcc + 0.3 V 4.7k to 10k pull-up to host_Vcc, OH measured at host side of connector SFP Input LOW V 0 0.8 V 4.7k to 10k pull-up to Vcc, IL measured at SFP side of connector SFP Input HIGH V 2 Vcc + 0.3 V 4.7k to 10k pull-up to Vcc, IH measured at SFP side of connector Table 3. Low-speed signals, electronic characteristics  Finisar Corporation – August 2015 Rev. E1 Page 3

FCLF-8520/8521-3 Product Specification   IV. High-Speed Electrical Interface   All high-speed signals are AC-coupled internally.     High-Speed Electrical Interface, Transmission Line-SFP Parameter Symbol Min Typ Max Units Notes/Conditions Line Frequency fL   125   MHz 5-level encoding, per IEEE 802.3 Tx Output Impedance Zout,TX   100   Ohm Differential, for all frequencies between 1MHz and 125MHz Rx Input Impedance Zin,RX   100   Ohm Differential, for all frequencies between 1MHz and 125MHz Table 4. High-speed electrical interface, transmission line-SFP         High-Speed Electrical Interface, Host-SFP Parameter Symbol Min Typ Max Units Notes/Conditions Single ended data input Vinsing 250   1200 mV Single ended swing Single ended data output Voutsing 350   800 mV Single ended swing Rise/Fall Time T,T 175 psec 20%-80% r f Tx Input Impedance Zin   50   Ohm Single ended Rx Output Impedance Zout   50   Ohm Single ended Table 5. High-speed electrical interface, host-SFP  Finisar Corporation – August 2015 Rev. E1 Page 4

FCLF-8520/8521-3 Product Specification V. General Specifications     General Parameter Symbol Min Typ Max Units Notes/Conditions Data Rate BR 10   1,000 Mb/sec IEEE 802.3 compatible. See Notes 2 through 4 below Cable Length L   100 m Category 5 UTP. BER <10-12 Table 6. General specifications     Notes: 1. Clock tolerance is +/- 50 ppm 2. By default, the FCLF-8520/8521-3 is a full duplex device in preferred master mode 3. Automatic crossover detection is enabled. External crossover cable is not required 4. 10/100/1000 BASE-T operation requires the host system to have an SGMII interface with no clocks, and the module PHY to be configured per Application Note AN-2036. With a SERDES that does not support SGMII, the module will operate at 1000BASE-T only.       VI. Environmental Specifications   The FCLF-8520/8521-3 has an extended range from 0°C to +85°C case temperature as specified in Table 8.     Environmental Specifications Parameter Symbol Min Typ Max Units Notes/Conditions Operating Temperature Top 0   85 °C Case temperature Storage Temperature T -40 85 °C Ambient temperature sto Table 7. Environmental specifications       VII. Serial Communication Protocol   All Finisar SFPs support the 2-wire serial communication protocol outlined in the SFP MSA1. These SFPs use an Atmel AT24C01A 128 byte E2PROM with an address of A0h. For details on interfacing with the E2PROM, see the Atmel data sheet titled “AT24C01A/02/04/08/16 2-Wire Serial CMOS E2PROM.”3   The 1000BASE-T physical layer IC can also be accessed via the 2-wire serial bus at address ACh. For details interfacing with the PHY IC, see Marvell data sheet titled “Alaska Ultra 88E1111 Integrated Gigabit Ethernet Transceiver”4 (Marvell document number MV-S100649-00).  Finisar Corporation – August 2015 Rev. E1 Page 5

FCLF-8520/8521-3 Product Specification   Serial Bus Timing Requirements Parameter Symbol Min Typ Max Units Notes/Conditions I2C Clock Rate   0   100,000 Hz   Table 8. Serial bus timing requirements       VIII. Mechanical Specifications   The host-side of the FCLF-8520/8521-3 conforms to the mechanical specifications outlined in the SFP MSA1. The front portion of the SFP (part extending beyond the face plate of the host) is larger to accommodate the RJ-45 connector. See Figure 2 below for details. Figure 2. FCLF-8520/8521-3 mechanical dimensions  Finisar Corporation – August 2015 Rev. E1 Page 6

FCLF-8520/8521-3 Product Specification IX. References   1. Small Form Factor Pluggable (SFP) Transceiver Multi-Source Agreement (MSA), September 2000. Documentation is currently available at Finisar upon request.   2. IEEE Std 802.3, 2002 Edition. IEEE Standards Department, 2002.   3. “AT24C01A/02/04/08/16 2-Wire Serial CMOS E2PROM”, Atmel Corporation. www.Atmel.com   4. “Alaska Ultra 88E1111 Integrated 10/100/1000 Gigabit Ethernet Transceiver”, Marvell Corporation. www.marvell.com 5. Directive 2011/65/EU of the European Council Parliament and of the Council, “on the restriction of the use of certain hazardous substances in electrical and electronic equipment”. 6. “Application Note AN-2038: Finisar Implementation of RoHS Compliant Transceivers”         X. For More Information     Finisar Corporation 1389 Moffett Park Drive Sunnyvale, CA 94089-1133 Tel. 1-408-548-1000 Fax 1-408-541-6138 sales@finisar.com www.finisar.com  Finisar Corporation – August 2015 Rev. E1 Page 7