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40G QSFP+ TO 4SFP+ Direct Attach Cable

40G QSFP+ TO 4SFP+ Direct Attach Cable

40G QSFP+ TO 4SFP+ Direct Attach Cable

QSFP+ Direct Attach Cables are compliant with the SFF-8436 specifications. SFP+ Direct Attach Cables are compliant with the SFF-8431, SFF-8432 and SFF-8472 specifications. Various choices of wire gauge are available from 30 to 24 AWG with various choices of cable length (up to 7m).

Features of 40G QSFP+ TO 4SFP+ 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+ TO 4SFP+ 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+ TO 4SFP+ Direct Attach Cable

General Product Characteristics
High Speed Characteristics
Regulatory Compliance

QSFP+ TO 4SFP+ 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(QSFP+)

20 pins edge connector(SFP+)

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


QSFP+ Pin definition

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+ TO 4SFP+ Direct Attach Cable

Pin-Descriptions3.jpg




SFP+ Pin definition

Pin

Symbol

Name/Description

1

VEET [1]

Transmitter Ground

2

Tx_FAULT [2]

Not used

3

Tx_DIS [3]

Not used

4

SDA [2]

2-wire Serial Interface Data Line

5

SCL [2]

2-wire Serial Interface Clock Line

6

MOD_ABS [4]

Module Absent. Grounded within the module

7

RS0 [5]

Not used

8

RX_LOS [2]

Loss of Signal indication. Logic 0 indicates normal operation

9

RS1 [5]

Not used

10

VEER [1]

Receiver Ground

11

VEER [1]

Receiver Ground

12

RD-

Receiver Inverted DATA out. AC Coupled

13

RD+

Receiver DATA out. AC Coupled

14

VEER [1]

Receiver Ground

15

VCCR

Receiver Power Supply

16

VCCT

Transmitter Power Supply

17

VEET [1]

Transmitter Ground

18

TD+

Transmitter DATA in. AC Coupled

19

TD-

Transmitter Inverted DATA in. AC Coupled

20

VEET [1]

Transmitter Ground

Notes:

1. Module circuit ground is isolated from module chassis ground within the module.

2. should be pulled up with 4.7k – 10k ohms on host board to a voltage between 3.15Vand 3.6V.

3. Tx_Disable is an input contact with a 4.7 kΩ to 10 kΩ pullup to VccT inside the module.

4. Mod_ABS is connected to VeeT or VeeR in the SFP+ module. The host may pull this contact up to Vcc_Host with a resistor in the range 4.7 kΩ to10 kΩ.Mod_ABS is asserted “High” when the SFP+ module is physically absent from a host slot.

5. RS0 and RS1 are module inputs and are pulled low to VeeT with > 30 kΩ resistors in the module.

SFP+-Pin-definition.jpg


Mechanical Dimensions of 40G QSFP+ TO 4SFP+ Direct Attach Cable

The connector is compatible with the SFF-8436 to SFF-8432 specification.

Mechanical-Dimensions3.jpg

Length (m)

Cable AWG

1

30

3

30

5

26

7

26


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