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QSFP28 100G DAC Cable

Ascent’s QSFP28 passive direct attach copper twinax cable assemblies are high-performance, cost-effective I/O solutions for 100G Ethernet and 100G Fiber Channel applications.

•    QSFP28 conforms to Small Form-Factor SFF8665

•    4-channel full-duplex passive copper cable transceiver

•    Supports data rates: 25.78 Gb/s (per channel)

•    Maximum aggregate data rate: 100Gb/s (4 x 25.78Gb/s)

•    IEEE 802.3bj 100GEBASE-CR4

•    Copper link x (x=1m, 2m, 3m, 5m)

•    Power Supply: +3.3V

•    Low crosstalk

•    I2C based two-wire serial interface for EEPROM signature which can be customized

•    Operating temperature: 0 °C to +70 °C

•    Compatible to QSFP28 MSA

•    RoHS Compliant


Absolute Maximum Ratings  

Parameter

Symbol

Min.

Typ.

  Max.

Unit

Storage Temperature


‑40


+85

°C

Operating Case Temperature

Tc

0


+70

°C

Power Supply Voltage

VCC3

3.14

3.3

3.47

V

Data Rate Per Lane


1


25.78

Gb/s

 

Note: Damage may occur if the transceiver is subjected to conditions beyond the limits.

 

High Speed Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Note

Differential Impedance

RIN, P

9

100

110

Ω


Insertion Loss

SDD2

8


22.48

dB

At 12.8906

Differential Return Loss

SDD11

SDD22

12.45


See 1

dB

At 0.05 to

3.12


See 2

At 4.1 to 19

Common‑Mode to Common‑Mode Output Return Loss

SCC11

SCC22

 2



dB

At 0.2 to 19 GHz

Differential to Common‑Mode Return Loss

SCD11

SCD22 

12


See 3

dB

At 0.01 to

10.58


See 4

At 12.89 to

Differential to Common Mode Conversion Loss

SCD21‑IL

10



dB

At 0.01 to



See 5

At 12.89 to

6.3



At 15.7 to

Channel Operating Margin

COM

3



dB


 

Notes:

1. Reflection Coefficient given by equation SDD11(d B) < 16.5 ‑ 2 × SQRT(f ), with finGHz.

2. Reflection Coefficient given by equation SDD11(dB) < 10.66 ‑ 14 × log10(f/5.5), with finGHz.

3. Reflection Coefficient given by equation SCD11(d B) < 22 ‑ (20/25.78)*f, with finGHz.

4. Reflection Coefficient given by equation SCD11(dB) < 15 ‑ (6/25.78)*f, with finGHz.

5. Reflection Coefficient given by equation SCD21(dB) < 27 ‑ (29/22)*f, with finGHz.


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