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40G QSFP+ Direct Attach Cable

40G QSFP+ Direct Attach Cable

QSFP+ Direct Attach Cables are compliant with the SFF-8436 specifications. Various choices of wire gauge are available from 30 to 26 AWG with various choices of cable length (up to 7m).


Features of 40G QSFP+ Direct Attach Cable

  • Up to 10.3125Gbps data rate per channel

  • Up to 7m transmission

  • Hot-pluggable QSFP+ 38 PIN footprint

  • Compatible to SFF-8436

  • Single 3.3V power supply

  • Temperature Range: 0~ 70 °C

  • RoHS compliant


Applications of 40G QSFP+ Direct Attach Cable

  • Low EMI radiation switches, servers and routers

  • Data center networks

  • Storage area networks

  • High performance computing

  • Telecommunication and wireless infrastructure

  • Medical diagnostics and networking

  • Test and measurement equipment


Specifications of 40G QSFP+ Direct Attach Cable

General Product Characteristics
High Speed Characteristics
Regulatory Compliance

QSFP+ DAC Specifications


Number of Lanes

Tx & Rx

Channel Data Rate

10.3125 Gbps

Operating Temperature

0 to + 70°C

Storage Temperature

-40 to + 85°C

Supply Voltage

3.3 V nominal

Electrical Interface

38 pins edge connector

Management Interface

Serial, I2C


Parameter

Symbol

Min

Typ

Max

Units

Notes

Differential Impedance

Zd

90

100

110

Ω

-

Differential Input Return Loss

SDDXX

<-12+2* SQRT (f) with f in GHz

dB

0.01~4.1GHz

<-6.3+13*Log10/(f/5.5) with f in GHz

dB

4.1~11.1GHz

Common Mode Output Return Loss

SCCXX

< -7+1.6*f with f in GHz

dB

0.01~2.5GHz

-

-

-3

dB

2.5~11.1GHz

Difference Waveform Distortion Penalty

dWDPc

-

-

6.75

dB

-

VMA Loss

L

-

-

4.4

dB

-

VMA Loss to Crosstalk Ratio

VCR

32.5

-

-

dB

-



Feature

Test Method

Performance

Electrostatic Discharge (ESD) to the Electrical Pins

MIL-STD-883C Method 3015.7

Class 1(>2000 Volts)

Electromagnetic Interference(EMI)

FCC Class B

Compliant with Standards

CENELEC EN55022 Class B

CISPR22 ITE Class B

RF Immunity(RFI)

IEC61000-4-3

Typically Show no Measurable Effect from a 10V/m Field Swept from 80 to 1000MHz

RoHS Compliance

RoHS Directive 2011/65/EU and it's Amendment Directives 6/6

RoHS 6/6 compliant


Recommended Operation Condition of 40G QSFP+ Direct Attach Cable

Parameter

Symbol

Min

Max

Unit

Operating Case Temperature

Topc

0

70

degC

Storage Temperature

Tst

-40

85

degC

Relative Humidity (non-condensation)

RS

35

60

%

Supply Voltage

VCC3

3.135

3.465

V

Voltage on LVTTL Input

Vilvttl

-0.3

VCC3  +0.2

V

Power Supply Current

ICC3


15

mA

Total Power Consumption

Pd

-

0.05

W

Notes:

Stress or conditions exceed the above range may cause permanent damage to the device.

This is a stress rating only and functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not applied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.


Pin Definition of 40G QSFP+ Direct Attach Cable

Pin

Symbol

Name/Description

1

GND

Ground

2

Tx2n

Transmitter Inverted Data Input

3

Tx2p

Transmitter Non-Inverted Data Input

4

GND

Ground

5

Tx4n

Transmitter Inverted Data Input

6

Tx4p

Transmitter Non-Inverted Data Input

7

GND

Ground

8

ModSelL

Module Select

9

ResetL

Module Reset

10

Vcc Rx

+3.3 V Power supply receiver

11

SCL

2-wire serial interface clock

12

SDA

2-wire serial interface data

13

GND

Ground

14

Rx3p

Receiver Non-Inverted Data Output

15

Rx3n

Receiver Inverted Data Output

16

GND

Ground

17

Rx1p

Receiver Non-Inverted Data Output

18

Rx1n

Receiver Inverted Data Output

19

GND

Ground

20

GND

Ground

21

Rx2n

Receiver Inverted Data Output

22

Rx2p

Receiver Non-Inverted Data Output

23

GND

Ground

24

Rx4n

Receiver Inverted Data Output

25

Rx4p

Receiver Non-Inverted Data Output

26

GND

Ground

27

ModPrsL

Module Present

28

IntL

Interrupt

29

Vcc Tx

+3.3 V Power supply transmitter

30

Vcc1

+3.3 V Power Supply

31

LPMode

Low Power Mode

32

GND

Ground

33

Tx3p

Transmitter Non-Inverted Data Input

34

Tx3n

Transmitter Inverted Data Input

35

GND

Ground

36

Tx1p

Transmitter Non-Inverted Data Input

37

Tx1n

Transmitter Inverted Data Input

38

GND

Ground



Pin Descriptions of 40G QSFP+ Direct Attach Cable

Pin-Descriptions1.jpg


Mechanical Dimensions of 40G QSFP+ Direct Attach Cable

The connector is compatible with the SFF-8436 specification.

Mechanical-Dimensions1.jpg



Length (m)

Cable AWG

1

30

3

30

5

26

7

26


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