Arista Compatible Compatible QSFP-40G-PLRL4 Quick Spec:

Part Number: QSFP-40G-PLRL4

QSFP-40G-PLRL4-IND

Arista QSFP-40G-PLRL4 Datasheet (40GBase, eSR4, QSFP+, MMF, 400m, MPO, COM) Fiber Optic Transceiver

Form Factor: QSFP

TX Wavelength: 1310nm

Reach: 1.4km

Cable Type: SMF

Rate Category: 40Gbase

Interface Type: IR4-PSM

DDM: Yes

Connector Type: MPO

Optical Power Budget: 7.4dB

TX Power Min/Max: -5.20 to +0.50 dBm

RX Power Min/Max: -12.6 to 0.50 dBm


Arista Compatible Compatible QSFP-40G-PLRL4 Product Features


Arista Compatible Compatible QSFP-40G-PLRL4 Overview

The QSFP-40G-PLRL4 is a parallel 40 Gbps Quad Small Form-factor Pluggable (QSFP+) optical module. It provides increased port density and total system cost savings. The QSFP+ full-duplex optical module offers 4 independent transmit and receive channels, each capable of 10 Gbps operation for an aggregate data rate of 40 Gbps over 1.5km of single mode fiber. An optical fiber ribbon cable with an MPO/MTPTM connector can be plugged into the QSFP+ 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 a z-pluggable 38-pin connector. The module operates via 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 «Part» design is compliant to QSFP+ Multi-source agreement (MSA) in terms of form factor, optical/electrical connection and digital diagnostic interface. It has been designed to meet the harshest external operating conditions including temperature, humidity and EMI interference. The module can be managed through the I2C two-wire serial interface.


Arista Compatible Compatible QSFP-40G-PLRL4 Functional Diagram

This product converts the 4-channel 10 Gbps electrical input data into CWDM optical signals (light), by a driven 4- wavelength Distributed Feedback Laser (DFB) array. The light is combined by the MUX parts as a 40 Gbps data, propagating out of the transmitter module from the SMF. The receiver module accepts the 40 Gbps CWDM optical signals input, and de-multiplexes it into 4 individual 10Gbps channels with different wavelengths. Each wavelength is collected by a discrete avalanche photodiode (APD), and then outputted as electric data after amplified first by a TIA and then by a post amplifier. Figure 1 shows the functional block diagram of this product.


A single +3.3V power supply is required to power up this product. 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, this product responds to 2-wire serial communication commands. The ModSelL allows the use of this product on a single 2-wire interface bus – individual ModSelL lines must be used.


image

Laser Driver Array (4ch)

DFB

Laser Array (4ch)

Micro- optics

MPT/MPO

Laser Driver

DFB

Laser


Micro-

Array (4ch)

Array (4ch)

optics

Tx3 Tx2 Tx1 Tx0

Rx3 Rx2 Rx1 Rx0

Figure 1. Functional diagram

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


The ResetL pin enables a complete reset, returning the 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 it indicates a completion of the reset interrupt. The product 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 product in order 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 product, is normally pulled up to the host Vcc. When the product is inserted into the connector, it completes the path to ground though a resistor on the host board and asserts the signal. ModPrsL then indicates its present by setting ModPrsL to a “Low” state.


Interrupt (IntL) is an output pin. “Low” indicates a possible 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.


image

Absolute Maximum Ratings

Parameter

Symbol

Min

Max

Unit


Storage Temperature


Ts


-40


+85

°C

Relative Humidity

RH

0

85

%

Supply Voltage

Vcc

3.15

3.14

V


Recommended Operating Conditions


Parameter

Symbol

Min

Typ

Max

Unit

Storage Temperature (Standard)


Ts


0


+70

°C

Storage Temperature (Industrial)


Ts

-40


+85

°C

Power Supply voltage

Vcc

3.15

3.3

3.45

V

Power Consumption



0


3.5

W

Data Rate

DR


10.3


Gbps

Data Speed tolerance

LDR

-100


100

Ppm

Link Distance with G652




15

Km


Recommended Power Supply Filter


Arista QSFP-40G-PLRL4 Datasheet (40GBase, eSR4, QSFP+, MMF, 400m, MPO, COM) Fiber Optic Transceiver


Electrical Characteristics - Transmitter


Parameter

Symbol

Min

Typ

Max

Unit

Differential Input Impedance


90

100

110

Ohm

Differential Input Swing


190


700

mV

TP1/TP1a Interface


Compliant to IEEE 802.3ba XLPPI



Electrical Characteristics - Receiver


Parameter

Symbol

Min

Typ

Max

Unit

Differential Output Impedance


90

100

110

Ohm

Termination Mismatch at 1MHz


300


850

mV

Output Differential Return Loss


Compliant to IEEE 802.3ba

dB


Optical Characteristics - Transmitter


Parameter

Symbol

Min

Typ

Max

Unit

Notes

Center Wavelength

λ0

1260

1310

1360

nm

1

RMS Spectral Width

Λrms



3.5

nm

1

Average Launch Power

Pavg

-5.2

-2.5

+0.5

dBm


Optical Modulation Amplitude (OMA) (each Lane)

POMA

-4.5

-2.5

+2.0

dBm

1

Launch Power in OMA minus Transmitter and dispersion Penalty (TDP), each lange

OMA- TDP

-9.7



dBm

1

Rise/Fall Time

Tr/Tf



50

Ps


Extinction Ration

ER

3.5



dB


Relative Intensity Noise

RIN



-128

dB/Hz


Optical Return Lose Tolerance

TOL



12

dB


Transmitter Reflectance

RT



-12

dB


Transmitter Eye Mask Margin

EMM

5



%


Transmitter Eye Mask Definition

{X1, X2, X3, Y1, Y2, Y3}


{0.25, 0.4, 0.45, 0.25, 0.28, 0.4}



Average Launch Power OF (each lane)

Poff



-30

dBm


Note: Transmitter optical characteristics are measured with a single mode fiber.


Optical Characteristics - Receiver


Parameter

Symbol

Min

Typ

Max

Unit

Notes

Centre Wavelength

λ0

1260

1310

1360

nm


Damage Threshold


Thd

+3



dBm


Overload, (each Lane)


OVL

+0.5



dBm


Receiver Sensitivity in OMA (each Lane)

SEN



-12.6

dBm


Difference in Receive Power between any two Lanes (OMA)

Prx,diff



5.0

dB


Signal Loss Assert Threshold

LOSA

-30



dBm


Signal Loss Deassert Threshold

LOSD



-15

dBm


LOS Hysteresis

LOSH

0.5


6

dB


Optical Return Loss

ORL



-12

dBm


Receiver Electrical 3dB upper cut-off Frequency (each Lane)

Fc



12

GHz


Notes:

  1. 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.

  2. Vertical eye closure penalty and stressed eye jitter are test conditions for measuring stressed receiver sensitivity. They are not characteristics of the receiver.


    Digitial Diagnostics Function

    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

    DMITEMP

    -3


    3

    deg. C

    Over operating temperature range

    Supply voltage monitor absolute error

    DMIVCC

    -0.1


    0.1

    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

    Note 1: Due to measurement accuracy of different multi-mode fibers, there could be an additional ±1dB fluctuation, or ± 3dB total accuracy.


    Mode-Conditioning Patch Cable

    Figure 2. shows the orientation of the multi-mode facets of the optical connector.


    Arista QSFP-40G-PLRL4 Datasheet (40GBase, eSR4, QSFP+, MMF, 400m, MPO, COM) Fiber Optic Transceiver


    Figure 2. Optical connector


    Fiber

    Description

    PIN

    Description

    1

    Rx (0)

    7

    Not used

    2

    Rx (1)

    8

    Not used

    3

    Rx (2)

    9

    Tx (3)

    4

    Rx (3)

    10

    Tx (2)

    5

    Not used

    11

    Tx (1)

    6

    Not used

    12

    Tx (0)


    PIN Assignment and Function Definitions

    PIN Assignment


    Arista QSFP-40G-PLRL4 Datasheet (40GBase, eSR4, QSFP+, MMF, 400m, MPO, COM) Fiber Optic Transceiver


    PIN Definition

    PIN

    Signal Name

    Description

    1

    GND

    Ground (1)

    2

    Tx2n

    CML-I Transmitter 2 Inverted Data Input

    3

    Tx2p

    CML-I Transmitter 2 Non-Inverted Data Input

    4

    GND

    Ground (1)

    5

    Tx4n

    CML-I Transmitter 4 Inverted Data Input

    6

    Tx4p

    CML-I Transmitter 4 Non-Inverted Data Input

    7

    GND

    Ground (1)

    8

    ModSelL

    LVTLL-I Module Select

    9

    ResetL

    LVTLL-I Module Reset

    10

    VCCRx

    +3.3V Power Supply Receiver (2)

    11

    SCL

    LVCMOS-I/O 2-Wire Serial Interface Clock

    12

    SDA

    LVCMOS-I/O 2-Wire Serial Interface Data

    13

    GND

    Ground (1)

    14

    Rx3p

    CML-O Receiver 3 Non-Inverted Data Output

    15

    Rx3n

    CML-O Receiver 3 Inverted Data Output

    16

    GND

    Ground (1)

    17

    Rx1p

    CML-O Receiver 1 Non-Inverted Data Output

    18

    Rx1n

    CML-O Receiver 1 Inverted Data Output

    19

    GND

    Ground (1)

    20

    GND

    Ground (1)

    21

    Rx2n

    CML-O Receiver 2 Inverted Data Output

    22

    Rx2p

    CML-O Receiver 2 Non-Inverted Data Output

    23

    GND

    Ground (1)

    24

    Rx4n

    CML-O Receiver 4 Inverted Data Output

    25

    Rx4p

    CML-O Receiver 4 Non-Inverted Data Output

    26

    GND

    Ground (1)

    27

    ModPrsL

    Module Present

    28

    IntL

    Interrupt

    29

    VCCTx

    +3.3V Power Supply Transmitter (2)

    30

    VCC1

    +3.3V Power Supply

    31

    LPMode

    LVTLL-I Low Power Mode

    32

    GND

    Ground (1)

    33

    Tx3p

    CML-I Transmitter 3 Non-Inverted Data Input

    34

    Tx3n

    CML-I Transmitter 3 Inverted Data Input

    35

    GND

    Ground (1)

    36

    Tx1p

    CML-I Transmitter 1 Non-Inverted Data Input

    37

    Tx1n

    CML-I Transmitter 1 Inverted Data Input

    38

    GND

    Ground (1)

    Notes:

    1. All Ground (GND) are common within the QSFP+ module and all module voltages are referenced to this potential unless noted otherwise. Connect these directly to the host board signal common ground plane.

    2. VccRx, Vcc1 and VccTx are the receiving and transmission power suppliers and shall be applied concurrently. The connector pins are each rated for a maximum current of 500mA.