Finisar Finisar Corporation Page 1Rev A, Feb 2003Product Specification1000BASE-T Copper GBIC TransceiversFCM-8520/8521-3Product Features• Up to 1.25Gb/s bi-directionaldata links• Extended operating temperaturerange (0°C to +75°C)• Hot-pluggable• Fully metallic enclosure for lowEMI• Low power (1.5W typical)• Access to physical layer IC via 2-wire serial busApplications• 1.25 Gigabit Ethernet over Cat 5cableFinisar’s FCM-8520/8521-3 1000BASE-T Copper GBIC transceivers are based on theGBIC Specification Revision 5.51. They are compatible with the Gigabit Ethernet and1000BASE-T standards as specified in IEEE Std 802.3z2and IEEE Std 802.3ab3.The FCM-8520-3 uses the GBIC’s RX_LOS pin for link indication, and 1000BASE-Xauto-negotiation must be disabled on the host system. The FCM-8521-3 is compatiblewith 1000BASE-X auto-negotiation, but does not have a link indication feature(RX_LOS is internally grounded). See AN-2032, “Commonly Asked QuestionsRegarding Auto-negotiation on Finisar’s 1000BASE-T GBICs”4, for a more completeexplanation on the differences between the two models.PRODUCT SELECTIONPart Number Link Indicator on RX_LOS Pin Compatible with 1000BASE-XAuto-negotiationFCM-8520-3 Yes NoFCM-8521-3 No YesFCM-8520/8521-3 1000BASE-T GBIC Product Specification Finisar Finisar Corporation Page 2Rev A, Feb 2003I. GBIC to Host Connector Pin OutTable 1. GBIC to host connector pin assignment“Sequence” indicates the order in which pins make contact when the device is hotplugged. For additional information, see “Table 3: Signal Definitions” in the GBICSpecification Revision 5.5.1Pin Name Pin # SequenceRX_LOS* 1 2GND 2 2GND 3 2MOD_DEF(0) 4 2MOD_DEF(1) 5 2MOD_DEF(2) 6 2TX_DISABLE 7 2GND 8 2GND 9 2GND 10 2GND 11 1-RX_DAT 12 1+RX_DAT 13 1GND 14 1VCC 15 2VCC 16 2GND 17 1+TX_DAT 18 1-TX_DAT 19 1GND 20 1Note: RX_LOS is used for link indication on the FCM8520-3,and is internally grounded on the FCM-8521-3FCM-8520/8521-3 1000BASE-T GBIC Product Specification Finisar Finisar Corporation Page 3Rev A, Feb 2003II. +5V Volt Electrical Power InterfaceThe FCM-8520/8521-3 has an extended input voltage range of 4.5 to 5.5 V, compared tothe GBIC standard of 4.25 to 5.25 V. The 6V maximum voltage is not allowed forcontinuous operation.Note:1. Caution: Power consumption and inrush current are higher than the specifiedvalues in the GBIC Specification Rev 5.51.III. Low-Speed SignalsRX_LOS is a TTL signals as described in Table 3 and 4. MOD_DEF(1) (SCL) andMOD_DEF(2) (SDA), are open drain CMOS signals (see section VII, “SerialCommunication Protocol”). Both MOD_DEF(1) and MOD_DEF(2) must be pulled up tohost_Vcc. For more detailed information, see sections 5.3.1 – 5.3.8 in the GBICSpecification Rev. 5.51.+5 Volt Electrical PowerInterfaceParameter Symbol Min Typ Max Units Notes/ConditionsSupply Current Is 310 375 mA 1.7W max power overfull range of voltageand temperature.See Note 1.Input Voltage Vcc 4.5 5 5.5 V Referenced to GND.Maximum Voltage Vmax 6 VSurge Current Isurge 450 mA Hot plug. See Note 1.Table 2. +5 Volt electrical power interfaceLow-Speed Signals,Electronic CharacteristicsParameter Symbol Min Max Units Notes/ConditionsGBIC Output LOW VOL 0 0.5 V 4.7k to 10k pull-up to host_Vcc,measured at host side of connectorGBIC Output HIGH VOH host_Vcc - 0.5 host_Vcc + 0.3 V 4.7k to 10k pull-up to host_Vcc,measured at host side of connectorGBIC Input LOW VIL 0 0.8 V 4.7k to 10k pull-up to Vcc,measured at GBIC side ofconnectorGBIC Input HIGH VIH 2 Vcc + 0.3 V 4.7k to 10k pull-up to Vcc,measured at GBIC side ofconnectorTable 3. Low-speed signals, electronic characteristicsFCM-8520/8521-3 1000BASE-T GBIC Product Specification Finisar Finisar Corporation Page 4Rev A, Feb 2003IV. High-Speed Electrical InterfaceAll high-speed signals are AC-coupled internally.V. General SpecificationsNotes:1. Clock tolerance is ±50 ppm2. The FCM-8520/8521-3 is a full-duplex device in the “Preferred Master” mode.3. Automatic crossover detection is enabled. External crossover cable is not requiredHigh-Speed Electrical Interface,Host-GBICParameter Symbol Min Typ Max Units Notes/ConditionsDifferential InputVoltageVindiff 0.50 2.00 V Differential peak - peakDifferential OutputVoltageVoutdiff 0.37 2.00 V Differential peak - peakRise/Fall Time Tr,Tf 250 psec 20%-80% DifferentialTx Input Impedance Zin 75 OhmRx Output Impedance Zout 75 OhmTable 5. High-speed electrical interface, host-GBIC
GeneralParameter Symbol Min Typ Max Units Notes/ConditionsData Rate BR 1.25 Gb/sec IEEE 802.3 compatible.See Notes 1 and 2 below.Cable Length L 100 m Category 5 UTP. BER <10-10Table 6. General specificationsHigh-Speed ElectricalInterface,Transmission Line-GBICParameter Symbol Min Typ Max Units Notes/ConditionsLine Frequency fL 125 MHz 5-level encoding, perIEEE 802.3ab.Tx Output Impedance Zout,TX 100 Ohm Differential, for allfrequencies between1MHz and 125MHz.Rx Input Impedance Zin,RX 100 Ohm Differential, for allfrequencies between1MHz and 125MHz.Table 4. High-speed electrical interface, transmission line-GBICFCM-8520/8521-3 1000BASE-T GBIC Product Specification Finisar Finisar Corporation Page 5Rev A, Feb 2003VI. Environmental SpecificationsThe FCM-8520-3 has an extended range from 0°C to +75°C case temperature asspecified in Table 8.VII. Serial Communication ProtocolAll Finisar GBICs are ‘Module Definition “4”’ and support the 2-wire serialcommunication protocol outlined in the GBIC Specification1. These GBICs use an AtmelAT24C01A 128 byte E2PROM with an address of A0h. For details on interfacing withthe E2PROM, see the Atmel data sheet titled “AT24C01A/02/04/08/16 2-Wire SerialCMOS E2PROM.”5
The 1000BASE-T physical layer IC can also be accessed via the 2-wire serial bus ataddress A4h. For details interfacing with the PHY IC, see Marvell data sheet titled“Alaska Ultra 88E1011/88E1001S Integrated Gigabit Ethernet Transceiver”6(Marvelldocument number Symbol Min Typ Max Units Notes/ConditionsOperating Temperature Top 0 75 °C Case temperatureStorage Temperature Tsto -40 85 °C Ambient temperatureTable 7. Environmental specificationsSerial Bus TimingRequirementsParameter Symbol Min Typ Max Units Notes/ConditionsI2C Clock Rate 0 100,000 HzTable 8. Serial bus timing requirementsFCM-8520/8521-3 1000BASE-T GBIC Product Specification Finisar Finisar Corporation Page 6Rev A, Feb 2003VIII. Mechanical SpecificationsThe host-side of the FCM-8520-3 conforms to the mechanical specifications outlined inthe GBIC Specification Revision 5.5, Section 61. The front portion of the GBIC (partextending beyond the face plate of the host) is larger to accommodate the RJ-45connector. See Figure 1 below for details.Figure 1. FCM-8520/8521-3 mechanical dimensionsFCM-8520/8521-3 1000BASE-T GBIC Product Specification Finisar Finisar Corporation Page 7Rev A, Feb 2003IX. References1. “Gigabit Interface Converter (GBIC) Revision 5.5”. Sun Microsystems ComputerCompany et. al., September 27, 2000. http://playground.sun.com/pub/OEmod/2. IEEE Std 802.3z. IEEE Standards Department, 2000.3. “IEEE Std 802.3ab-1999 ‘Physical Layer Parameters and Specifications for 1000Mb/s Operation Over 4-Pair of Category 5 Balanced Copper Cabling, Type1000BASE-T”. IEEE Standards Department, 1999.4. “Application Note AN-XXXX: Commonly Asked Questions Regarding Autonegotiationon Finisar’s 1000BASE-T GBICs”, Finisar Corporation, February 20035. “AT24C01A/02/04/08/16 2-Wire Serial CMOS E2PROM”. Atmel Corporation.www.Atmel.com6. “Alaska Ultra 88E1011/88E1001S Integrated 10/100/1000 Gigabit EthernetTransceiver”. Marvell Corporation. www.marvell.comX. For More InformationFinisar Corporation1308 Moffett Park DriveSunnyvale, CA 94089-1133