D-Net`S Passive DAC Direct Attach Copper Cable Service
● Compatibility Assistance: D-NET offers compatibility services to guarantee that its optical modules are fully compatible with equipment from prominent manufacturers.
● Personalized Services: D-NET provides OEM customization options for its products, allowing customers to request colored logo labels tailored to their specific needs.
● Standard Delivery Timeframe: 3 Days
● Comprehensive Shipping Solutions: D-NET partners with reputable courier services including SF, FedEx, DHL, UPS, and more to ensure dependable shipping options.
Features
● Data rate of a single channel reaching 25Gbps
● Compliant with SFP28 MSA specifications and SFF-8432 standards
● Adheres to IEEE 802.3 and FCoE protocols
● Improved EMI/EMC (Electromagnetic Interference/Electromagnetic Compatibility) performance
● Supports serial ID functionality via EEPROM (Electrically Erasable Programmable Read-Only Memory)
● Offers cable customization options up to a length of 5 meters
● Available in cable gauges ranging from 30AWG to 26AWG
● Options compliant with RoHS and halogen-free requirements
Applications
● Switches, Routers, and Host Bus Adapters (HBAs)
● Servers and storage systems
● Data center networking infrastructure
● Base stations, Baseband Units (BBUs), and Remote Radio Units (RRUs)
● Fiber Channel technology
● 25Gbps Ethernet connections
Outline drawing
Wiring Diagram
Electrical Performance
Signal Integrity：
|
(ITEM) |
(REQUIREMENT) |
(TEST CONDITION) |
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|
(Differe ntial Impedan ce) |
Cable Impedance |
105+5/-10Ω |
Rise time of 25ps (20 % - 80 %). |
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|
Paddle Card Impedance |
100±10Ω |
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|
Cable Termination Impedance |
100±15Ω |
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|
[Differential (Input/Output)Return loss SDD11/SDD22] |
Return_loss(f)≥16.5-2√f 0.05≤f﹤4.1 10.66-14log10(f/ 5.5) 4.1≤f≤19 Where f is the frequency in GHz Return loss(f) is the return loss at frequency f
|
10MHz≤f ≤19GHz |
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[Differential to common-mode (Input/Output)Return loss SCD11/SCD22] |
Return_loss(f)≥22-(20/25.78)f 0.01≤f﹤12.89 15-(6/25.78)f 12.89≤f≤19 Where f is the frequency in GHz Return_loss(f) is the Differential to common-mode return loss at frequency f
|
10MHz≤f ≤19GHz |
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|
[Common-mode to Common-mode (Input/Output)Return loss SCC11/SCC22] |
Return_loss(f)≥2dB 0.2≤f≤19 Where f is the frequency in GHz Return_loss(f) is the common-mode to common-mode return loss at frequency f
|
10MHz≤f ≤19GHz |
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|
[Differential Insertion Loss (SDD21 Max.)] |
(Differential InsertionLoss Max. For TPa to TPb Excluding Test fixture ) |
10MHz≤f ≤19GHz |
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|
F AWG |
1.25GHz |
2.5GHz |
5.0GHz |
7.0GHz |
10Ghz |
12.89Ghz |
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|
30(1m) |
4.5dB |
5.4dB |
6.3dB |
7.5dB |
8.5dB |
10.5dB |
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|
Max. |
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|
30/28( 3m)Ma x. |
7.5dB |
9.5dB |
12.2dB |
14.8dB |
18.0dB |
21.5dB |
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|
26(3m) Max. |
5.7dB |
7.2dB |
9.9 dB |
11.9dB |
14.1dB |
16.5dB |
|
|
|
26/25( 5m)Ma x. |
7.8dB |
10.0dB |
13.5dB |
16.0dB |
19.0dB |
22.0dB |
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|
Differential to common-mode Conversion Loss-Differential Insertion Loss(SCD21-SDD21) |
Conversion _loss(f) – IL(f)≥ 27-(29/22)f 12.89≤f﹤15.7 6.3 15.7≤f≤19 10 0.01≤f﹤12.89 Where f is the frequency in GHz Conversion_loss(f ) is the cable assembly differential to common-mode conversion loss IL(f) is the cable assembly insertion loss |
10MHz≤f ≤19GHz |
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|
[MDNEXT(multiple disturber near-end crosstalk)] |
≥26dB @12.89GHz |
10MHz≤f ≤19GHz |
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|
[Intra Skew] |
15ps/m, |
10MHz≤f ≤19GHz |
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Other Electrical Performance：
|
(ITEM) |
(REQUIREMENT) |
(TEST CONDITON) |
|
[Low Level Contact Resistance] |
70milliohms Max. From initial. |
EIA-364-23:Apply a maximum voltage of 20mV And a current of 100 mA. |
|
Insulation Resistance |
10Mohm(Min.) |
EIA364-21:AC 300V 1minute |
|
[Dielectric Withstanding Voltage] |
NO disruptive discharge. |
EIA-364-20:Apply a voltage of 300 VDC for 1minute between adjacent terminals And between adjacent terminals and ground. |
Environment Performance
|
(ITEM) |
(REQUIREMENT) |
(TEST CONDITON) |
|
[Operating Temp. Range] |
-40°C to +80°C |
Cable operating temperature range. |
|
[Storage Temp. Range (in packed condition)] |
-40°C to +80°C |
Cable storage temperature range in packed condition. |
|
[Thermal Cycling Non-Powered] |
No evidence of physical damage |
EIA-364-32D, Method A, -25 to 90C, 100 cycles, 15 min. dwells |
|
[Salt Spraying] |
48 hours salt spraying after shell corrosive area less than 5％. |
EIA-364-26 |
|
Mixed Flowing Gas |
Pass electrical tests per 3.1 after stressing. (For connector only) |
EIA-364-35 Class II,14 days. |
|
Temp. Life |
No evidence of physical damage |
EIA-364-17C w/ RH, Damp heat 90℃ at 85% RH for 500 hours then return to ambient |
|
Cable Cold Bend |
4H,No evidence of physical damage |
Condition: -20℃±2℃, mandrel diameter is 6 times the cable diameter. |
Mechanical and Physical Characteristics
|
(ITEM) |
(REQUIREMENT) |
(TEST CONDITON) |
|
Vibration |
Pass electrical tests per 3.1 after stressing. |
Clamp & vibrate per EIA-364-28E, TC-VII, test condition letter – D, 15 minutes in X, Y & Z axis. |
|
Twist |
No evidence of physical |
Twist cable 180° (±90° from nominal |
|
Twist |
damage |
position) for 100 cycles at 30 cycles per minute with a 0.5kg load applied to the cable jacket. Clamp position: 300mm |
|
Cable Flex |
No evidence of physical damage |
Flex cable 180° for 20 cycles (±90° from nominal position) at 12 cycles per minute with a 1.0kg load applied to the cable jacket. Flex in the boot area 90º in each direction from vertical. Per EIA-364-41C |
|
Cable Plug Retention in Cage |
90N Min. No evidence of physical damage |
Force to be applied axially with no damage to cage. Per SFF 8661 Rev 2.1 Pull on cable jacket approximately 1 ft behind cable plug. No functional damage to cable plug below 90N. Per SFF-8432 Rev 5.0 |
|
Cable Retention in Plug |
90N Min. No evidence of physical damage |
Cable plug is fixtured with the bulk cable hanging vertically. A 90N axial load is applied (gradually) to the cable jacket and held for 1 minute. Per EIA-364-38B |
|
Mechanical Shock |
Pass electrical tests Per 3.1 after stressing. |
Clamp and shock per EIA-364-27B, TC-G,3 times in 6 directions, 100g, 6ms. |
|
Cable Plug Insertion |
18N Max.(SFP28) |
Per SFF-8432 Rev 5.0 |
|
Cable plug Extraction |
12.5N Max. (SFP28) |
Measure without the aid of any cage kick-out springs. Place axial load on de-latch to de-latch plug. Per SFF-8432 Rev 5.0 |
|
Durability |
50 cycles,No evidence of physical damage |
EIA-364-09, perform plug &unplug cycles:Plug and receptacle mate rate: 250times/hour. 50times for QSFP28/SFP28 module (CONNECTOR TO PCB) |
FAQ
1. What is the difference between a 25G SFP28 Passive DAC Direct Attach Copper Cable and an optical fiber cable?
A: The main difference is the transmission medium: copper vs. optical fiber. Copper DAC cables are typically more cost-effective and easier to install for short-distance applications, while optical fiber cables are used for longer distances and can support higher data rates.
2. How do I troubleshoot a 25G SFP28 Passive DAC Direct Attach Copper Cable that is not working?
A: Start by checking the connections on both ends of the cable and ensuring they are properly seated. If the issue persists, use a cable tester to check for continuity and signal integrity. Additionally, check for any signs of damage or wear on the cable.
3. Are 25G SFP28 Passive DAC Direct Attach Copper Cables hot-swappable?
A: Yes, they are designed to be hot-swappable, allowing you to remove and replace them without the need to power down the network equipment. It is crucial to adhere to the manufacturer's guidelines for safe and correct hot-swapping procedures at all times.
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