High-speed cables, often also known as DAC, Direct Attach Copper Cable, are cables with integrated connectors and copper cables, which are easy and simple to use. High-speed cables can be directly connected to the optical interface of the device to use, and the difference with the AOC fiber optic cable is that the high-speed cable uses copper cable in the middle, and the signal is transmitted through the copper wire, while the AOC fiber optic cable is transmitted through the optical fiber.
         Huawei company has a model SFP-10G-CU3M high-speed cable products, can support 10G Ethernet short distance applications, Motek Optoelectronics Laboratory prototype testing of the product, to facilitate further understanding of the product's performance indicators and the effect of the actual machine use.
1. Product Description
         Huawei SFP-10G-CU3M high-speed cable supports 3M link length on 10G copper cable. The official key parameters and the physical appearance of the module are as follows:
Table 1 Huawei SFP-10G-CU3M Official description
Model
 Length
Electrical Attributes
Bend Radius
Connector Type
 Part Code
SFP-10G-CU3M
3m
Passive
25mm
SFP+<->SFP+
02310MUP


Figure 1 Huawei SFP-10G-CU3M Physical Image
2. Module on-board identification
         Connect the SFP-10G-CU3M high-speed cable to Huawei S6700-24-EI switch, the module can be LINKed normally, and the port indicator lights up; the module information at both ends of the cable can be recognized normally by the switch, such as the module type, model number, vendor name, serial number, transmission distance, etc.; there is no alarm phenomenon.
Table 2 Huawei SFP-10G-CU3M on-board identification
Item
 Information read by the switch
Interface
indicator
LINK

Identify 

 
3. Module Key Parameter Test
3.1 S-parameter Test
         The S parameters of the modules at both ends of the cable are tested using a network analyzer under normal temperature conditions, and the test results are as follows;
Table 3 Huawei SFP-10G-CU3M S-parameter curve

Direction

Direction Reflection curve (SDD11) 
Insertion loss curve (SDD21)
A end to B end
 
B end to A end

 
 
Table 4 Huawei SFP-10G-CU3M S parameter data
Direction
SDD11(dB)
IL(dB)
A end to B end
-20.278
9.576
B end to A end
-16.159
9.443
3.2 Impedance Test
The differential impedance of the modules at both ends of the cable is tested using an oscilloscope at room temperature, and the test results are as follows;
Table 5 Impedance diagram of Huawei SFP-10G-CU3M cable
Module
 Differential signal direction TX 
Differential signal direction RX
A Bend
Bend
 
Table 6 Huawei SFP-10G-CU3M cable impedance data
Module 
 Differential signal direction
Maximum value (ohm) 
Minimum value (ohm)
 Average value (ohm)
A end
TX
105.11
97.61
101.36
RX
106.76
97.89
102.32
end
TX
104.22
97.84
101.03
RX
107.00
98.18
102.58
 
 
         From the actual test situation, the key parameters of the module are in line with Huawei's official claims.
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