DAC is widely used in storage area network, data center and high performance computer connection, and is gradually rising in network communication.widely used in storage area network, data center and high performance computer connection, and is gradually rising in network communication.
There are two kinds of DAC, one is 10g SFP + DAC, the other is 40g qsfp + to 4 SFPs +. The ports of these cables can not be replaced, only the finished wires can be replaced together, and the module head and copper cable cannot be separated.
Features
Compliant with SFF- 8436, SFF-8431, SFF-8432 and SFF-8472
Up to 10. 3125Gbps data rate per channel
Up to 7m transmission
Operating temperature: -40℃ to +80℃
Single 3.3V power supply
RoHS compliant
Benefits
Cost-effective copper solution
Lowest total system power solution
Lowest total system EMI solution
Optimized design for Signal Integrity
Applications
40G Ethernet
General Product Characteristics
Q/4SFP+ DAC Specifications | |
Number of Lanes | Tx & Rx |
Channel Data Rate | 10.3125 Gbps |
Operating Temperature | 0 to + 70°C |
Storage Temperature | -40 to + 85°C |
Supply Voltage | 3.3 V nominal |
Electrical Interface | 38 pins edge connector(QSFP+) 20 pins edge connector(SFP+)
|
Management Interface | Serial, I2C |
High Speed Characteristics
Parameter | Symbol | Min | Typ | Max | Units | Notes |
Differential Impedance | Zd | 90 | 100 | 110 | Ω | |
Differential Input Return Loss |
SDDXX | <-12+2* SQRT (f) with f in GHz | dB | 0.01~4.1GHz | ||
<-6.3+13* Log10/(f/5.5) with f in GHz | dB | 4.1~11.1GHz | ||||
Common Mode Output Return Loss |
SCCXX | < -7+1.6*f with f in GHz | dB | 0.01~2.5GHz | ||
-3 | dB | 2.5~11.1GHz | ||||
Difference Waveform Distortion Penalty | dWDPc | 6.75 | dB | |||
VMA Loss | L | 4.4 | dB | |||
VMA Loss to Crosstalk Ratio | VCR | 32.5 | dB | |||
What is the structure of high speed cable DAC?
Simply put, a high-speed cable DAC connects optical modules at both ends of a cable.
In detail, the high-speed cable DAC is made of silver plated conductor and foam insulated core wire, which adopts line pair shielding and total shielding, thus forming high-speed cable. Here is a picture.
What are the products of high speed cable DAC?
1: 100g qsfp28 DAC direct connection cable
The 100ge qsfp28 passive copper cable can provide customers with 100GB / high bandwidth data interconnection capability and provide 4-way duplex channels. The working rate of each channel can be up to 25gb / s, and the convergence bandwidth is 100GB / s
Sff-8665 / sff-8679 and IEEE 802.3bj and Infiniband EDR
It can support a distance range of 1 m to 3 m. The product is widely used in data center or Supercomputer Center system scenarios
2: 100ge qsfp28 to 25g sfp28 DAC direct connect cable
100ge qsfp28 to 4x 25ge sfp28 parallel fan out passive copper cable can provide customers with 100GB / high bandwidth data interconnection capability, one end of which is 100ge qsfp28 and the other end is 4x 25ge sfp28
Sff-8665 / sff-8679 and IEEE 802.3bj and Infiniband EDR
It supports a distance range of 1-3 meters, which is widely used in data center or Supercomputing Center system scenarios
The advantages of high speed cable DAC are as follows:
1. High performance: it is suitable for short distance wiring in data center, with wide application range and strong integration scheme ability.
2. Energy saving and environmental protection: the internal material of high-speed cable is copper core, the natural heat dissipation effect of copper cable is good, energy saving and environmental protection.
3. Low power consumption: low power consumption of high-speed cable. Because the passive cable does not need power supply, the power consumption is almost zero; the power consumption of active cable is generally about 440mw.
4. Low cost: copper is much cheaper than fiber, so using high-speed cable can greatly reduce the cabling cost of the entire data center.
Mechanical Specifications
The connector is compatible with the SFF-8436 to SFF-8432 specification.
Compared with AOC, DAC has many advantages. The bit error rate (BER) of Avago active cable is 10-15, while that of direct copper cable is 10-12. That is to say, the bit error rate of Avago active cable is less than once a day, while that of copper cable is once every 1-2 minutes. Since the high frequency EMI signal is processed in the pluggable module, only the optical signal will pass through the optical cable, so the EMI immunity of active optical cable is better than that of directly connected copper cable. At 10g speed, the connection distance of the SFP + and qsfp + versions of these active cables can reach 20 meters, while the copper cables are only slightly more than 5 meters. In addition, the weight of the active optical cable is only 25% of that of the direct copper cable, and the diameter of the cable is smaller. The minimum bending radius of the cable is only 30mm, which is much better than that of the directly connected copper cable. These positive advantages can bring customers the correct solutions and specifications that meet the requirements of high-density optical interconnection specifications.
HTF's Direct Attach Cables have a complete range, long warranty time and reasonable price.
Contact：support@htfuture.com
Skype：sales5_ 1909，WeChat：16635025029
