Channel Insertion Loss - Nvidia BlueField-3 User Manual

Category
Harnesses
Accessories

11.2 Channel Insertion Loss

Channel insertion loss is the signal power loss resulting from a device's insertion in a transmission
line or optical fiber and is usually expressed in decibels (dB).
The following table describes the
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 Socket Direct PCIe Auxiliary Card Loss is 1.5dB (@16Ghz).
The Cabline CA-II Plus harness loss at 16GHz:
Harness Length
15cm
35cm
55cm
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 GF) to be 9.5dB @16Ghz.
Please note that the BlueField-3 AIC, together with a 15cm Cabline CA-II Plus harnesses and the
Passive PCIe Auxiliary Card loss is 10.3dB, which is approved by NVIDIA.
Qty
1 Cabline CA-II Plus harness (white) - Length according to kit
OPN (15, 25 or 35cm)
1 Cabline CA-II Plus harness (black) - Length according to kit
OPN (15, 25 or 35cm)
2 Retention Clip for Cabeline harness (shipped assembled on
the harnesses - optional)
1 PCIe Auxiliary card short bracket
1 PCIe Auxiliary card tall bracket (shipped assembled on the
Auxiliary card)
NVIDIA® BlueField®-3 channel insertion loss budget for PCIe Gen
3.8dB
7.6dB
11.4dB
Item
Channel Loss at Gen 5.0
75