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400G QSFP-DD  DAC Direct Attach Cable
400G QSFP-DD  DAC Direct Attach Cable
400G QSFP-DD DAC Direct Attach Cable

A low-cost solution for short-distance connection within and 

between data center cabinets,400G QSFP-DD  DAC Direct Attach 

Cable (DT-DAC-400G-QSFP-DD),DAYTAI QSFP-DD passive

Model: DT-DAC-400G-QSFP-DD Brand: DAYTAI
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Product Description

A low-cost solution for short-distance connection within and between data center cabinets,400G QSFP-DD  DAC Direct Attach Cable 

(DT-DAC-400G-QSFP-DD),DAYTAI QSFP-DD passive copper cable assembly feature eight differential copper pairs,providing four data

transmission channels at speeds up to 56Gbps(PAM4) per channel,and meets 400G Ethernet and InfiniBand Enhanced Data Rate(EDR)

requirements.Available in a broad rang of wire gages-from 28AWG through 30AWG-this 400G copper cable assembly features low 

insertion loss and low cross talk. QSFP-DD uses PAM4 signals for transmission, which doubles the rate. However, there are more stringent 

requirements for cable insertion loss. For detailed requirements, please see High Speed Characteristics.Compatible With the Brand:Cisco,

Juniper,Brocade,Arista,Mellanox,HPE,Dell,Dell Force10,Huawei...Etc is Optional,Length: 0.5m,1m,1.5m,2m, 3m...is Optional.


Features

⊙Data Center networks.

⊙Storage area networks.

⊙Switches, servers and routers.

⊙High performance computing.

⊙Wire AWG: AWG30, AWG24.

⊙Telecommunication and wireless infrastructure.

⊙Compatible with IEEE 802.3bj and IEEE 802.3cd.

⊙Customized cable braid termination limits EMI radiation.

⊙Straight and break out assembly configurations available.

⊙Optimized construction to minimize insertion loss and cross talk.

Specification


Item

Specification

Parameter

Symbol

Min

Typical

Max.

Unit

Note

Differential Impedance

TDR

90

100

110

Ω


Insertion Loss

SDD21

-16.06



dB

At 13.28GHz

Differential Return Loss

SDD11

SDD22



See 1

dB

At 0.05 to 4.1 GHz



See 2

At 4.1 to 19 GHz

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



See 3

dB

At 0.01 to 12.89 GHz

SCD22



See 4

At 12.89 to 19 GHz

Differential to common Mode Conversion Loss

SCD21-IL



-10

dB

At 0.01 to 12.89 GHz



See 5

At 12.89 to 15.7 GH



-6.3

At 15.7 to 19 GHz

Notes:

1.Reflection Coefficient given by equation SDD11(dB) < -16.5 + 2 × SQRT(f ), with f in GHz

2.Reflection Coefficient given by equation SDD11(dB) < -10.66 + 14 × log10(f/5.5), with f in GHz

3.Reflection Coefficient given by equation SCD11(dB) < -22 + (20/25.78)*f, with f in GHz

4.Reflection Coefficient given by equation SCD11(dB) < -15 + (6/25.78)*f, with f in GHz

5.Reflection Coefficient given by equation SCD21(dB) < -27 + (29/22)*f, with f in GHz

 


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