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 Finisar Corporation – August 2015 Rev. E1 Page 1 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)  Access to physical layer IC via 2-wire serial bus  10/100/1000 BASE-T operation in host systems with SGMII interface

APPLICATIONS

 1.25 Gigabit Ethernet over Cat 5 cable 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 Indicator on RX_LOS Pin 1000BASE-X auto-negotiation enabled by default FCLF-8520-3 Yes No FCLF-8521-3 No Yes

1 V EET Transmitter ground (common with receiver ground) 1

7 Rate Select No connection required

9 V EER Receiver ground (common with transmitter ground) 1

10 V EER Receiver ground (common with transmitter ground) 1

11 V EER Receiver ground (common with transmitter ground) 1

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

20 V EET Transmitter ground (common with receiver ground) 1

  1. PHY disabled on TDIS > 2.0V or open, enabled on TDIS < 0.8V

MOD_DEF(0) pulls line low to indicate module is plugged in.

  1. 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

1 VeeT

2 TXFault

3 TX Disable

4 MOD-DEF(2)

5 MOD-DEF(1)

6 MOD-DEF(0)

7 Rate Select

8 LOS

9 VeeR

10 VeeR

Figure 1. Diagram of host board connector block pin numbers and names

voltage is not allowed for continuous operation. Table 2. +3.3 Volt electrical power interface must be pulled up to host_Vcc. Table 3. Low-speed signals, electronic characteristics

All high-speed signals are AC-coupled internally. Table 4. High-speed electrical interface, transmission line-SFP Table 5. High-speed electrical interface, host-SFP

Data Rate BR 10 1,000 Mb/sec IEEE 802.3 compatible. Table 6. General specifications

  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. Table 7. Environmental specifications MSA1. These SFPs use an Atmel AT24C01A 128 byte E 2PROM with an address of A0h.

Table 8. Serial bus timing requirements Figure 2. FCLF-8520/8521-3 mechanical dimensions

FCLF-8520/8521-3 Product Specification  Finisar Corporation – August 2015 Rev. E1 Page 7 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 E 2PROM”, 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 C ouncil 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