10GB Ethernet interface for real-time continuous monitoring of 3 Gbps video content

October 18, 2012-Tektronix, the market leader in broadcast video testing, monitoring and analysis solutions, has announced that its upgraded Sentry® and Sentry Verify solutions have new 10GB interfaces that make them the industry ’s first comprehensive The real-time video quality monitor that monitors the broadcast of 3 Gbps video programs enables cable operators and other video service providers to quickly identify and diagnose video and audio errors in the 10GB portion of their networks.

Before Sentry and Sentry Verify added a 10GB interface, existing products suitable for 10GB networks provided very basic monitoring functions, such as notification of packet loss—which in itself was not a reliable indicator of quality problems. In addition to using a combination of 10GB Ethernet interface and industry-leading features to continuously monitor 3 Gbps program content, Sentry also includes advanced quality of user experience (QoE) monitoring capabilities, supplemented by Sentry Verify's quality of service (QoS) monitoring capabilities. Sentry and Sentry Verify can work independently or as part of a comprehensive solution, giving video service providers greater insight into the content, helping to identify and diagnose video and audio errors that affect the quality of the viewer ’s experience.

"These upgraded features of Sentry and Sentry Verify are the latest examples of our listening to customers and developing specialized solutions to help them ensure the best quality of video and audio programming to their audiences," said Eben Jenkins, general manager of Tektronix ’video product line. "Sentry and Sentry Verify's advanced monitoring capabilities provide cable operators and other video service providers with unprecedented rich information to help them provide digital video services of the highest quality on a 10GB network."

Sentry and Sentry Verify are complementary to other members of the growing Sentry product family, enabling cable operators and other video service providers to comprehensively monitor program broadcasts at all important locations in their networks. From content acquisition to transcoding and advertisement insertion, to multiplexing and QAM modulation, the Tektronix Sentry content monitor product family enables service providers to identify all critical locations and video and audio errors that affect users during the video transmission process steps.

For more information about Sentry, please visit http: // or call 310.227.8620.

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About Sentry

Sentry is a series of award-winning, comprehensive content monitoring solutions for cable, communications, IPTV and other video service providers. Sentry supports early detection and diagnosis of video and audio problems (ie, picture freezing, macro-blocking, audio loss, etc.)-no matter when these errors occur or where on the network, service providers can therefore Provide high-quality services to ensure users get the best quality of experience (QoE). Sentry achieves this through the unprecedented visibility of the network at the IP and content levels, monitoring the scalability of all programs in the network, and its unique combination of functions for real-time, 24/7 operation.

About Tektronix

For more than 60 years, engineers have continuously sought test, measurement, and monitoring solutions from Tektronix to meet design challenges, increase production efficiency, and significantly reduce time to market. Tektronix is ​​a leading provider of test instruments, supporting engineers focused on electronic design, manufacturing, and advanced technology development. Tektronix is ​​headquartered in Beaverton, Oregon, USA, and provides highly acclaimed service and support to customers worldwide. For cutting-edge technology, please log in.

4 Layer PCB

What is 4 layer PCB?

Four-layer circuit board is a kind of Printed Circuit Board. It is made of four layers of glass fibre, which can reduce the cost of PCB.

Compared with Double Sided PCB , multi-layer PCB have many advantages. They can be designed more compactly. They can greatly improve noise resistance and make layout easier. 

There are also great differences between the 2-layer and 4-layer PCB. For details, please click: What's the difference between 2 layer and 4 layer PCBs?

4 layer PCB stackup and thickness

4 layers PCB stackup

4 layer PCB stackup

4 layer PCB stackup include two inner layers, inner layer 1 and 2, are sandwiched between the top and bottom layers. From top to bottom, the 4-layer PCB stackup like below ,The top, i.e. the signal layer (0.0014 in. width) is followed by a prepreg layer with a thickness of 0.0091 in. and dielectric constant of 4.2. The top layer is copper material. The prepreg layer is followed by inner layer 1 (0.0014 in.), referred to as the plane. A core sublayer is part of inner layer 1, which has a width of 0.037 in. This is followed by inner layer 2, which is another plane layer made with 1 oz. copper and is 0.0014 in. thick. Another prepreg sublayer constituting two sheets that are 0.0091 in. thick forms part of inner layer 2. The final layer, the bottom layer, is also 0.0014 in. thick, and is a signal layer as well. Interconnects are soldered and placed on the top and bottom layers.

4-layer PCB has two stacking forms

The standard 4-layer PCB stack is shown below, and GND and VCC can be switched according to the layer with more signals.

The standard 4-layer PCB stack

If you don't want to connect all the ground pins through the hole, there will be different stacks and wide power routing on the signal plane.

4-layer PCB stack another type

For the following reasons, this may be a better stack to use a four-layer PCB:

  • The signal layer is adjacent to the plane. The signal running on the reference plane (whose voltage is exactly at the VCC) will still return on the reference plane.
  • Signal layers are tightly coupled to their adjacent planes.
  • The ground surface can be used as a shield for the internal signal layer. You will get better results, so that your plane height is as low as possible.
  • Multiple grounding layers reduce the grounding (reference plane) impedance of PCB and common mode radiation.

When the high-speed signal changes the reference plane, there should be a nearby path for its return current to move between the two reference planes. Using two horizons, you can do this by connecting two planes directly to a single channel. For grounding and power layers, the connection must be made through capacitors, which usually require two through-holes and one capacitor. This means worse signal integrity and more circuit board occupancy. On the other hand, having a power plane can reduce the voltage drop on the power rail, thereby releasing the space on the signal layer.

PCB Board Thickness





0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.6mm, 2.0mm, 2.4mm, Please contact us if your board exceeds these.

4 layer PCB Prototype

4-layer circuit board prototyping refers to the trial production of Printed Circuit Boards before mass production. It is mainly used for electronic engineers to design circuits and complete PCB Layout, then to carry out small-scale trial production process to the factory, that is, proofing PCB. The production quantity of four-ply proofing generally has no specific boundaries. Generally, engineers call it proofing before product design has not been confirmed and test has been completed.

Notices for proofing of four-layer circuit boards

The precautions for the production of four-layer PCB samples generally include two groups, one is the Engineer group, the other is the PCB Sample manufacturer.

As a group of engineers, the matters needing attention in proofing are as follows:

1. Choose proofing quantity carefully to control cost effectively.
2. Specially confirm device packaging to avoid proofing failure due to packaging errors.
3. Conduct comprehensive electrical inspection to improve the electrical performance of PCB board.
4. Make good signal integrity layout, reduce noise and improve PCB stability.

As a manufacturer of four-layer circuit boards, the precautions are as follows:

1. Check PCB files carefully to avoid data problems.
2. Conduct process approval in an all-round way and process configuration with self-manufacturer.
3. Control production quantity, reduce cost and maintain quality.
4. Communicate with customers who need samples to prevent accidents in advance.

4 layer PCB price and cost

We specialize in Quick Turn PCB services with an industry leading turnaround time as fast as 24 hours. Three low-cost options for a small number of PCB prototyping needs. At the same time, we also provided Flexible PCB , Rigid- Flex PCB , Metal Core PCB , High-TG PCB, Aluminum PCB , PCB Stencils, PCB Assembly Services and so on. Using the same high-tech equipment as our full-service PCB, it can be manufactured quickly and with virtually no limits.

Cost of four layer PCB is higher than double sided PCB  because of complexity of design and higher sensitivity. The better quality of signals, achieved by reducing distortion and propagation levels, is also a factor. Because of the higher levels of signal integrity and reduced interference levels, more manufacturers prefer four layer PCB.

4 layer PCB Manufacturing

We provide a full range of PCB functions to meet all your PCB needs. At present, we accept five PCB file formats (gerber file,.Pcb,.Pcbdoc.cam or.brd file format) for PCB manufacturing. But if you design a circuit board using Sprint-Layout software, you can send the. LAy6 file to us to manually generate the Gerber file.

JingHongyi PCB can provide you with multi-layer PCB board that meets RoHS standard. With laminated material, it can match high temperature in assembly process. It is important to remember that some lead-free assembly processes will require laminated substrates to withstand temperatures exceeding 260 degrees Celsius or 500 degrees Fahrenheit over a longer period of time. To solve this problem, we have high temperature laminates in stock, so that our customers can meet the higher temperature cycle requirements of some lead-free assembly applications.

Min. Order Quantity:  1 pcs
Material: FR-4
Finished Copper: 1oz/2oz/3oz(35μm/70μm/105μm)
Inner Layer Copper Thickness:1oz/1.5oz(35μm/50μm)
Silkscreen: White, Black, None
Surface Finishing: HASL with lead, HASL lead free, Immersion gold, Hard Gold ,OSP...
Shape: Custom Shape

100% Quality control

When making circuit boards, and after they are finished, we will test and inspect them strictly to ensure that the product reaches 100% eligibility rate. Preferential prices and higher quality have always been our constant pursuit:

  • E-test
  • AOI - Testing (Automatic Optical Detection)
  • X-ray (check multi-layer registration accuracy)
  • CCD-camera controlled drilling
  • Impedance control

4 Layer PCB
 Four Layer PCB

Videos for 4 layer PCB design and manufacturing

4 Layer PCB

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JingHongYi PCB (HK) Co., Limited , https://www.pcbjhy.com