Arista Compatible QSFP-100G-SR1.2-A-FL Quick Spec:

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Part Number: QSFP28-100GBase-SR1.2 QSFP28-100GBase-SR1.2-EXT QSFP28-100GBase-SR1.2-IND


Form Factor: QSFP28

TX Wavelength: 850nm/910nm

Reach: 100m

Cable Type: OM4 MMF

Rate Category: 100GBase

Interface Type: SR1.2

DDM: Yes

Connector Type: Dual-LC


Arista Compatible QSFP-100G-SR1.2-A-FL Features:


Arista Compatible QSFP-100G-SR1.2-A-FL General Description


This product can support 100Gb/s bit rates. It is a parallel Quad Small Form-factor Pluggable (QSFP28) Bi-Direction optical module. The module integrates four host electrical data into two optical lanes (by Dual Wavelength VCSEL Bi-Directional Optical Interface, 850nm and 910nm) to allow optical communication over a 2-fiber duplex LC optical multi-mode fiber. Reversely, on the receiver side, the module de-multiplexes 2 sets of optical input signal and converts them to 4 channels of electrical data.

An optical fiber ribbon cable with an LC connector can be plugged into the QSFP28 module receptacle. Proper alignment is ensured by the guide pins inside the receptacle. The cable usually cannot be twisted for proper channel to channel alignment. Electrical connection is achieved through an MSA-compliant 38-pin edge type connector.

The module operates by a single +3.3V power supply. LVCMOS/LVTTL global control signals, such as Module Present, Reset, Interrupt and Low Power Mode, are available with the modules. A 2-wire serial interface is available to send and receive more complex control signals, and to receive digital diagnostic information. Individual channels can be addressed and unused channels can be shut down for maximum design flexibility.


The product is designed with form factor, optical/electrical connections, and digital diagnostic interface according to the QSFP28 Multi-Source Agreement (MSA). It has been designed to meet the harshest external operating conditions including temperature, humidity, and EMI interference. The module offers very high functionality and feature integration, accessible via a two-wire serial interface.


Functional Description


This product can support 100Gb/s bit rates. It is a parallel Quad Small Form-factor Pluggable (QSFP28) Bi-Direction optical module. The module integrates four host electrical data into two optical lanes (by Dual Wavelength VCSEL Bi- Directional Optical Interface, 850nm and 900nm) to allow optical communication over a 2-fiber duplex LC optical multi- mode fiber. Reversely, on the receiver side, the module de-multiplexes 2 sets of optical input signal and converts them to 4 channels of electrical data. The receiver module outputs electrical signals are also voltage compatible with Common Mode Logic (CML) levels. Figure 1 shows the functional block diagram of this product.

A single +3.3V power supply is required to power up the module. Both power supply pins VccTx and VccRx are internally connected and should be applied concurrently. As per MSA specifications the module offers 7 low speed hardware control pins (including the 2-wire serial interface): ModSelL, SCL, SDA, ResetL, LPMode, ModPrsL and IntL.

Module Select (ModSelL) is an input pin. When held low by the host, the module responds to 2-wire serial communication commands. The ModSelL allows the use of multiple QSFP28 modules on a single 2-wire interface bus – individual ModSelL lines for each QSFP28 module must be used.

Serial Clock (SCL) and Serial Data (SDA) are required for the 2-wire serial bus communication interface and enable the host to access the QSFP28 memory map.

The ResetL pin enables a complete module reset, returning module settings to their default state, when a low level on the ResetL pin is held for longer than the minimum pulse length. During the execution of a reset the host shall disregard all status bits until the module indicates a completion of the reset interrupt. The module indicates this by posting an IntL (Interrupt) signal with the Data_Not_Ready bit negated in the memory map. Note that on power up (including hot insertion) the module should post this completion of reset interrupt without requiring a reset.

Low Power Mode (LPMode) pin is used to set the maximum power consumption for the module to protect hosts that are not capable of cooling higher power modules, should such modules be accidentally inserted.

Module Present (ModPrsL) is a signal local to the host board which, in the absence of a module, is normally pulled up to the host Vcc. When a module is inserted into the connector, it completes the path to ground through a resistor on the host board and asserts the signal. ModPrsL then indicates a module is present by setting ModPrsL to a “Low” state.

Interrupt (IntL) is an output pin. Low indicates a possible module operational fault or a status critical to the host system. The host identifies the source of the interrupt using the 2-wire serial interface. The IntL pin is an open collector output and must be pulled to the Host Vcc voltage on the Host board

.


Transceiver Block Diagram


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Figure 1. Transceiver Block Diagram


Pin Assignment and Description

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Figure 2. MSA Compliant Connector


Pin Definition


PIN

Logic

Symbol

Name/ Description

Notes

1


GND

Ground

1

2

CML- I

Tx2n

Transmitter Inverted Data Input


3

CML- I

Tx2p

Transmitter Non- Inverted Data output


4


GND

Ground

1

5

CML- I

Tx4n

Transmitter Inverted Data Input


6

CML- I

Tx4p

Transmitter Non- Inverted Data output


7


GND

Ground

1

8

LVTLL- I

ModSelL

Module Select


9

LVTLL- I

ResetL

Module Reset


10


VccRx

+3.3V Power Supply Receiver

2

11

LVCMOS-I/O

SCL

2 - Wire Serial Interface Clock


12

LVCMOS-I/O

SDA

2 - Wire Serial Interface Data


13


GND

Ground


14

CML- O

Rx3p

Receiver Non- Inverted Data Output


15

CML- O

Rx3n

Receiver Inverted Data Output


16


GND

Ground

1

17

CML- O

Rx1p

Receiver Non- Inverted Data Output


18

CML- O

Rx1n

Receiver Inverted Data Output


19


GND

Ground

1

20


GND

Ground

1

21

CML- O

Rx2n

Receiver Inverted Data Output


22

CML- O

Rx2p

Receiver Non- Inverted Data Output


23


GND

Ground

1

24

CML- O

Rx4n

Receiver Inverted Data Output

1

25

CML- O

Rx4p

Receiver Non- Inverted Data Output


26


GND

Ground

1

27

LVTTL- O

ModPrsL

Module Present


28

LVTTL- O

IntL

Interrupt


29


VccTx

+ 3.3 V Power Supply transmitter

2

30


Vcc1

+3.3 V Power Supply

2

31

LVTTL- I

LPMode

Low Power Mode



32


GND

Ground

1

33

CML- I

Tx3p

Transmitter Non- Inverted Data Input


34

CML- I

Tx3n

Transmitter Inverted Data Output


35


GND

Ground

1

36

CML- I

Tx1p

Transmitter Non- Inverted Data Input


37

CML- I

Tx1n

Transmitter Inverted Data Output


38


GND

Ground

1


Notes:


  1. GND is the symbol for signal and supply ( power) common for QSFP28 modules. All are common within the QSFP2 8 module and all module voltages are referenced to this potential unless otherwise noted. Connect these directly to the host board signal common ground plane.

  2. VccRx, Vcc1 and VccTx are the receiver and transmitter power suppliers and shall be applied concurrently. Recommended host board power supply filtering is shown in Figure 4 below. Vcc Rx, Vcc1 and Vcc Tx may be internally connected within the QSFP2 8 transceiver module in any combination. The connector pins are each rated for a maximum current of 1000 mA.


Absolute Maximum Ratings


Parameter

Symbol

Min

Max

Unit

Storage Temperature

Ts

-40

+85

°C

Operating Case Temp (Standard)

TOP

10

70

°C

Operating Case Temp (Industrial)

TOP

-40

85

°C

Power Supply Voltage

Vcc

-0.5

3.6

V

Relative Humidity (non-cond.)

RH

0

85

%

Damage Threshold, each lane

THd

5


dBm


Recommended Operating Conditions


Parameter

Symbol

Min

Typ

Max

Unit

Note

Operating Case Temp

TOP

10


70

°C


Power Supply Voltage

Vcc

3.135

3.3

3.465

V



Data Rate Accuracy


-100


100

ppm


Pre-FEC Bit Error Rate




2.4x10-4



Post-FEC Bit Error Rate




1x10-12


1

Control Input Voltage High)


2


Vcc

V


Control Input Voltage Low


0


0.8

V



Link Distance

OM3 D1



70

m

2

OM4 D2



100

m

2

OM5 D3



150

m

2


Notes:

  1. FEC provided by host system.

  2. FEC required on host system to support maximum distance.


Recommended Power Supply Filter


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Electrical Characteristics


Parameter

Symbol

Min

Typ

Max

Unit

Power Consumption




4

W

Supply Current

Icc



1.21

A

Electrical Characteristics-Transmitter (each lane)


Parameter

Symbol

Min

Typ

Max

Unit

Notes

Overload Differential Voltage pk- pk

TP1 a

900



mV


Common Mode Voltage

(Vcm)

TP1

-350


2850


mV

1

Differential Termination Resistance Mismatch

TP1



10

%


At 1MHz

Differential Return Loss (SDD11)


TP1



See CEI- 28G-VSR

Equ. 13-19


dB


Common Mode to Differential conversion and Differential to Common Mode

conversion ( SDC11, SCD11)


TP1




See CEI- 28G-VSR

Equation

13-20


dB



Stressed Input Test


TP1 a

See CEI- 28G-VSR

Section 13.3.11.2.1





Electrical Characteristics-Receiver (each lane)


Parameter

Symbol

Min

Typ

Max

Unit

Notes

Differential Voltage, pk- pk

TP4



900

mV


Common Mode Voltage (Vcm)

TP4

-350


2850

mV

1

Common Mode Noise,

RMS

TP4



17.5

mV


Differential Termination Resistance Mismatch

TP4



10

%

At 1MHz



Differential Return Loss (SDD22)


TP4



See CEI- 28G-VSR

Equation

13-19


dB


Common Mode to Differential conversion and Differential to Common Mode

conversion ( SDC22, SCD22)


TP4




See CEI- 28G-VSR

Equation

13-21


dB


Common Mode Return Loss (SCC22)

TP4



-2

dB

2

Transition Time, 20 to 80%

TP4

9.5



ps


Vertical Eye Closure ( VEC)

TP4



5.5

dB


Eye Width at 10-15

probability (EW15)

TP4


0.57




UI


Eye Height at 10-15

probability (EH15)

TP4

228




mV



Notes:

  1. Vcm is generated by the host. Specification includes effects of ground offset voltage.

  2. From 250MHz to 30GHz.


Optical Characteristics-Transmitter


Parameter

Symbol

Min

Typ

Max

Unit

Notes

Center Wavelength Line0


λC

844


863

nm


Center Wavelength Line1


λC

900


918

nm


RMS Spectral Width

∆λrms



λ1:

nm




0.




6




λ2:




0.65


Average Launch Power, each Lane

PAVG

-6.2


4

dBm


Optical Modulation Amplitude (OMA), each Lane


POMA


-4.2



3


dBm


1

Peak Power, each lane





- -

dBm


Launch power in OMA minus TDP, each lane



-5.6




dBm



TDECQ, each lane




4.5

dB


Extinction Ratio

ER

3.0



dB


Transmitter

transition time,

each lane (max)





31


ps


RIN12 OMA




-128

dB/Hz


Optical Return Loss Tolerance

TOL



12

dB


Average Launch

Poff



-30

dBm


Power OFF Transmitter, each Lane







Encircled Flux


≥ 86% at 19 μm

≤ 30% at 4.5 μm


2

Signaling rate, each lane


26.5625± 100ppm

Gbd/s



Optical Characteristics-Receiver


Parameter

Symbol

Min

Typ

Max

Unit

Notes

Center Wavelength Lane0


λC

844

850

863

nm


Center Wavelength Lane1


λC

900

910

918

nm


Damage Threshold, each Lane

THd

5



dBm

3

Average Receive Power, each lane


-8.2



dBm

4

Average power at receiver input, each lane (overload)





4


dBm


Receiver Reflectance

RR



-12

dB


Stressed receiver sensitivity in OMA, Lane2





-3.5


dBm


5


Receiver

sensitivity(OMA

outer), each lane




Max (- 6.6, SECQ

– 8) as per

IEEE cl 150


dBm


LOS Assert

LOSA

-30


-14.2

dBm


LOS Deassert

LOSD



-11.2

dBm


LOS Hysteresis

LOSH

0.5



dB



Notes:

  1. Even if the mTDEC<0.9 dB, the OMA (min) must exceed this value.


  2. If measured into type A1a.2 50um fiber in accordance with IEC 61280-1-4.


  3. The receiver shall be able to tolerate, without damage, continuous exposure to a modulated optical input signal having this power level on one lane. The receiver does not have to operate correctly at this input power.


  4. Average receive power, each lane (min) is informative and not the principal indicator of signal strength. A received power below this value cannot be compliant; however, a value above this does not ensure compliance.

  5. Measured with conformance test signal at TP3 as per following:

    Stressed eye closure (SECq), each lane

    4.5

    dB

    OMA of each aggressor, each lane

    3

    dBm


    Digital Diagnostic Functions

    The following digital diagnostic characteristics are defined over the normal operating conditions unless otherwise specified.

    Parameter

    Symbol

    Min

    Typ

    Max

    Unit

    Notes

    Temperature monitor absolute error

    DMI TEMP

    -3


    3

    deg. C

    Over operating temperature range

    Supply voltage monitor absolute error

    DMI VCC

    -0.15


    0.15

    V

    Over Full operating range

    Channel RX power monitor absolute error

    DMIRX_CH

    -2


    2

    dB

    1

    Channel Bias current monitor

    DMIIbias_CH

    -10%


    10%

    mA


    Channel TX power monitor absolute error

    DMITX_CH

    -2


    2

    dB

    1

    Notes:


    1. Due to measurement accuracy of different single mode fibers, there could be an additional +/-1 dB fluctuation, or a +/- 3 dB total accuracy.


Mechanical Dimensions


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ESD

Figure 5. Mechanical Outline

This transceiver is specified as ESD threshold 1 kV for high- speed data pins and 2 kV for all others electrical input pins, tested per MIL-STD-883, Method 3015.4 /JESD22- A114-A (HBM). However, normal ESD precautions are still required during the handling of this module. This transceiver is shipped in ESD protective packaging. It should be removed from the packaging and handled only in an ESD protected environment.


Laser Safety

This is a Class 1M Laser Product according to EN 60825-1:2014. This product complies with 21 CFR 1040. 10 except for deviations pursuant to Laser Notice No. 50, dated (June 24, 2007).


Licensing

The following U.S. patents are licensed by Finisar to FluxLight, Inc.: U.S. Patent Nos: 7,184,668, 7,079,775, 6,957,021, 7,058,310, 6,952,531, 7,162,160, 7,050,720