FCM-8520-3 - Finisar Corporation

Finisar

 Finisar Corporation Page 1

Rev A, Feb 2003

Product Specification

1000BASE-T Copper GBIC Transceivers

FCM-8520/8521-3

Product Features

• Up to 1.25Gb/s bi-directional

data links

• Extended operating temperature

range (0°C to +75°C)

• Hot-pluggable

• Fully metallic enclosure for low

EMI

• Low power (1.5W typical)

• Access to physical layer IC via 2-

wire serial bus

Applications

• 1.25 Gigabit Ethernet over Cat 5

cable

Finisar’s FCM-8520/8521-3 1000BASE-T Copper GBIC transceivers are based on the

GBIC Specification Revision 5.51. They are compatible with the Gigabit Ethernet and

1000BASE-T standards as specified in IEEE Std 802.3z2 and IEEE Std 802.3ab3.

The FCM-8520-3 uses the GBIC’s RX_LOS pin for link indication, and 1000BASE-X

auto-negotiation must be disabled on the host system. The FCM-8521-3 is compatible

with 1000BASE-X auto-negotiation, but does not have a link indication feature

(RX_LOS is internally grounded). See AN-2032, “Commonly Asked Questions

Regarding Auto-negotiation on Finisar’s 1000BASE-T GBICs”4, for a more complete

explanation on the differences between the two models.

PRODUCT SELECTION

Part Number Link Indicator on RX_LOS Pin Compatible with 1000BASE-X

Auto-negotiation

FCM-8520-3 Yes No

FCM-8521-3 No Yes

FCM-8520/8521-3 1000BASE-T GBIC Product Specification Finisar

 Finisar Corporation Page 2

Rev A, Feb 2003

I. GBIC to Host Connector Pin Out

Table 1. GBIC to host connector pin assignment

“Sequence” indicates the order in which pins make contact when the device is hot

plugged. For additional information, see “Table 3: Signal Definitions” in the GBIC

Specification Revision 5.5.1

Pin Name Pin # Sequence

RX_LOS* 1 2

GND 2 2

GND 3 2

MOD_DEF(0) 4 2

MOD_DEF(1) 5 2

MOD_DEF(2) 6 2

TX_DISABLE 7 2

GND 8 2

GND 9 2

GND 10 2

GND 11 1

-RX_DAT 12 1

+RX_DAT 13 1

GND 14 1

VCC 15 2

VCC 16 2

GND 17 1

+TX_DAT 18 1

-TX_DAT 19 1

GND 20 1

Note: RX_LOS is used for link indication on the FCM-

8520-3, and is internally grounded on the FCM-8521-3

FCM-8520/8521-3 1000BASE-T GBIC Product Specification Finisar

 Finisar Corporation Page 3

Rev A, Feb 2003

II. +5V Volt Electrical Power Interface

The FCM-8520/8521-3 has an extended input voltage range of 4.5 to 5.5 V, compared to

the GBIC standard of 4.25 to 5.25 V. The 6V maximum voltage is not allowed for

continuous operation.

Note:

1. Caution: Power consumption and inrush current are higher than the specified

values in the GBIC Specification Rev 5.51.

III. Low-Speed Signals

RX_LOS is a TTL signals as described in Table 3 and 4. 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. For more detailed information, see sections 5.3.1 – 5.3.8 in the GBIC

Specification Rev. 5.51.

+5 Volt Electrical Power

Interface

Parameter Symbol Min Typ Max Units Notes/Conditions

Supply Current Is 310 375 mA 1.7W max power over

full range of voltage

and temperature.

See Note 1.

Input Voltage Vcc 4.5 5 5.5 V Referenced to GND.

Maximum Voltage Vmax 6 V

Surge Current Isurge 450 mA Hot plug. See Note 1.

Table 2. +5 Volt electrical power interface

Low-Speed Signals,

Electronic Characteristics

Parameter Symbol Min Max Units Notes/Conditions

GBIC Output LOW VOL 0 0.5 V 4.7k to 10k pull-up to host_Vcc,

measured at host side of connector

GBIC 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 connector

GBIC Input LOW VIL 0 0.8 V 4.7k to 10k pull-up to Vcc,

measured at GBIC side of

connector

GBIC Input HIGH VIH 2 Vcc + 0.3 V 4.7k to 10k pull-up to Vcc,

measured at GBIC side of

connector

Table 3. Low-speed signals, electronic characteristics

FCM-8520/8521-3 1000BASE-T GBIC Product Specification Finisar

 Finisar Corporation Page 4

Rev A, Feb 2003

IV. High-Speed Electrical Interface

All high-speed signals are AC-coupled internally.

V. General Specifications

Notes:

1. Clock tolerance is ±50 ppm

2. 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 required

High-Speed Electrical Interface,

Host-GBIC

Parameter Symbol Min Typ Max Units Notes/Conditions

Differential Input

Voltage

Vindiff 0.50 2.00 V Differential peak - peak

Differential Output

Voltage

Voutdiff 0.37 2.00 V Differential peak - peak

Rise/Fall Time Tr,Tf 250 psec 20%-80% Differential

Tx Input Impedance Zin 75 Ohm

Rx Output Impedance Zout 75 Ohm

Table 5. High-speed electrical interface, host-GBIC

General

Parameter Symbol Min Typ Max Units Notes/Conditions

Data 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 <10-10

Table 6. General specifications

High-Speed Electrical

Interface,

Transmission Line-GBIC

Parameter Symbol Min Typ Max Units Notes/Conditions

Line Frequency fL 125 MHz 5-level encoding, per

IEEE 802.3ab.

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-GBIC

FCM-8520/8521-3 1000BASE-T GBIC Product Specification Finisar

 Finisar Corporation Page 5

Rev A, Feb 2003

VI. Environmental Specifications

The FCM-8520-3 has an extended range from 0°C to +75°C case temperature as

specified in Table 8.

VII. Serial Communication Protocol

All Finisar GBICs are ‘Module Definition “4”’ and support the 2-wire serial

communication protocol outlined in the GBIC Specification1. These GBICs 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.”5

The 1000BASE-T physical layer IC can also be accessed via the 2-wire serial bus at

address A4h. For details interfacing with the PHY IC, see Marvell data sheet titled

“Alaska Ultra 88E1011/88E1001S Integrated Gigabit Ethernet Transceiver”6 (Marvell

document number MV-5100281-00).

Environmental

Specifications

Parameter Symbol Min Typ Max Units Notes/Conditions

Operating Temperature Top 0 75 °C Case temperature

Storage Temperature Tsto -40 85 °C Ambient temperature

Table 7. Environmental specifications

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

FCM-8520/8521-3 1000BASE-T GBIC Product Specification Finisar

 Finisar Corporation Page 6

Rev A, Feb 2003

VIII. Mechanical Specifications

The host-side of the FCM-8520-3 conforms to the mechanical specifications outlined in

the GBIC Specification Revision 5.5, Section 61. The front portion of the GBIC (part

extending beyond the face plate of the host) is larger to accommodate the RJ-45

connector. See Figure 1 below for details.

Figure 1. FCM-8520/8521-3 mechanical dimensions

FCM-8520/8521-3 1000BASE-T GBIC Product Specification Finisar

 Finisar Corporation Page 7

Rev A, Feb 2003

IX. References

1. “Gigabit Interface Converter (GBIC) Revision 5.5”. Sun Microsystems Computer

Company 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 1000

Mb/s Operation Over 4-Pair of Category 5 Balanced Copper Cabling, Type

1000BASE-T”. IEEE Standards Department, 1999.

4. “Application Note AN-XXXX: Commonly Asked Questions Regarding Auto-

negotiation on Finisar’s 1000BASE-T GBICs”, Finisar Corporation, February 2003

5. “AT24C01A/02/04/08/16 2-Wire Serial CMOS E2PROM”. Atmel Corporation.

www.Atmel.com

6. “Alaska Ultra 88E1011/88E1001S Integrated 10/100/1000 Gigabit Ethernet

Transceiver”. Marvell Corporation. www.marvell.com

X. For More Information

Finisar Corporation

1308 Moffett Park Drive

Sunnyvale, CA 94089-1133

Tel. 1-408-548-1000

Fax 1-408-541-6138

sales@finisar.com