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400G QSFP-DD Passive Direct Attach Copper Twinax Cable617b5775831c5.jpg

400G QSFP-DD Passive Direct Attach Copper Twinax Cable

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.

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Description

Parameters

FeaturesApplication
Compatible with IEEE 802.3bj and IEEE 802.3cd.Switches, servers and routers.
Wire AWG: AWG30, AWG24.Storage area networks.
Optimized construction to minimize insertion loss and cross talk.Data Center networks.
Straight and break out assembly configurations available.High performance computing.
Customized cable braid termination limits EMI radiation.Telecommunication and wireless infrastructure.


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ParameterSymbolMinTypicalMax.UnitNote
Differential ImpedanceTDR90100110Ω
Insertion LossSDD21-16.06

dBAt 13.28GHz
Differential Return Loss

SDD11

SDD22



See 1dB
At 0.05 to 4.1 GHz


See 2At 4.1 to 19 GHz
Common-mode to common-mode output return loss

SCC11

SCC22



-2dBAt 0.2 to 19 GHz
Differential to common-mode return lossSCD11

See 3dBAt 0.01 to 12.89 GHz
SCD22

See 4At 12.89 to 19 GHz
Differential to common Mode Conversion LossSCD21-IL


-10dB
At 0.01 to 12.89 GHz


See 5

At 12.89 to 15.7 GH



-6.3At 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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