Nvidia BlueField-3 - 8.3 B3220 L SuperNICs Specifications

59
11.2 Channel Insertion Loss
Channel insertion lossis the loss ofsignalpowerresulting from the insertion of a device in
atransmission lineoroptical fiberand is usually expressed indecibels(dB).
The following table describes the BlueField-3 DPU channel insertion loss budget for PCIe Gen 5.0
architecture (32 GT/s).
The total PCIe channel insertion loss approved byPCI-SIG Gen5.0 specis36dB @16GHz.
The totalBlueField-3 DPU boardinsertion loss of thePCIe lanes(PCORE1) routed to theCabline CA-
II Plusis 6dB(@16GHz).
ThePassivePCIe Auxiliary Card Lossis1.5dB(@16Ghz).
TheCabline CA-II Plus harnessloss at 16GHz:
Harness Length Channel Loss at Gen 5.0
15cm 3.8dB
35cm 7.6dB
55cm 11.4dB
The above is measured data; it is recommended to add0.5dB marginsfor your system (some loss
variations are possible).
TheCabline CA-II Plus harnessesloss =0.24dB/cmfor Gen 5.0.
The above loss includes theCabline CA-II Plus harnessesandconnectorson both sides.
The PCI-SIG Gen5 SPEC also defines the total loss for AIC (bump to Golden-Fingers) to be 9.5dB
@16Ghz.
The BlueField-3 AIC, together with a 15cmCabline CA-II Plus harnesses andthe Passive PCIe
Auxiliary Card loss is: 3dB+2dB+3.8dB+1.5dB=10.3dB > 9.5dB
11.3 Cabline CA-II Plus Harness Pinouts
11.3.1 Cabline CA-II Plus Harness - Component Side
Pin# Signal Name Wire Type Detailed
Description
AWG# Pin# on the
other end
1 GND GND BAR 1