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VCC is short for Xilinx for internal voltage.

Vcc, short for Volt Current Condenser, means the power supply voltage of the circuit, power supply voltage (bipolar device); power supply voltage (74 series digital circuit); Voice Controlled Carrier; FireWire.


In electronic circuits, VCC is the supply voltage of the circuit, and VDD is the operating voltage of the chip:

VCC: C=circuit represents the meaning of the circuit, that is, the voltage connected to the circuit, D=device represents the meaning of the device, that is, the working voltage inside the device. In ordinary electronic circuits, generally Vcc>Vdd! Some ICs have both VCC and VDD, this device has a voltage conversion function. C=circuit means the circuit, that is, the voltage connected to the circuit. In electronic circuits, VCC is the supply voltage of the circuit

CadenceVirtual Component Co-design, VCC for short, is the first industrial system-level HW/SW co-design development platform environment designed for IP reuse. Cadence VCC enables designers to confirm the critical architecture of HW/SW division when designing first-generation products and related products in the early stage. Cadence VCC communicates and exchanges design information through the electronic supply chain, providing the necessary framework for the system library and SOC.

VCC (or Vcc) is a legacy of the previous TTL (Transistor-Transistor-Logic) technology era. In TTL components, the input and output transistor drive circuits are designed in a common collector mode. VCC (or Vcc) means the voltage on the common collector (Voltage of the Common Collector).

Cross connect

The TIA/EIA-568-A standard stipulates that connecting multiple IDFs (intermediate wiring closets) to the main MDF (main wiring closets) requires vertical wiring, also known as backbone wiring. VCC usually uses optical fiber because the length of vertical wiring is usually longer than the 100m limit of 5e twisted pair.

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VCC (Virtual CallCenter) means virtual call center.

Provide an operable and manageable call center outsourcing service business. Different VCC (Virtual Call Center) can have independent call access codes. VCC is independent of each other, does not affect each other, and has independent configuration, monitoring, quality inspection, and reporting. The resources belonging to the VCC are controlled, such as the allocation of adaptive relay resources, seat resources, and IVR resources. VCC administrators can remotely manage VCC. At the same time, the system provides a comprehensive service opening interface for a wide range of SP/ICP to quickly open services, thus forming a multiplicity of "equipment suppliers + network operators + content providers + users" Win the value chain of value-added services.

The VCC service provider itself makes the interface with the telecom operator, and obtains the uplink of the ordinary telephone of the communication network and realizes the landing of the communication network. Relative to users, VCC itself is purely an Internet-based operator.

Enterprise users can directly apply for the phone number of their own city or the nationwide 4006 phone number free of long-distance to users on the VCC as the access number of their own company or call center, and the numbers are all trunk numbers, which can be called in multiple ways at the same time . It is equivalent to pulling a trunk from the telecommunications company, rather than pulling the telephone line.

Enterprise users can also directly use VCC agent software to make extensions or agents. Realize making and receiving calls, the outgoing call will display your own access number, and the called user can call back. This is a big improvement for VOIP calls. This is equivalent to installing an extension on each seat in the company's internal wiring.

Enterprise users can also log in to VCC's camp business hall through account and password to perform IVR process configuration such as the welcome message after the user's phone comes in, and the call transfer menu. This is equivalent to the user installing a PBX switch that can be edited at any time.

Enterprise users can also check their own bills at any time in the online business hall, recharge and pay, and check the recording of each incoming and outgoing call, which is equivalent to building a recording system.

Compared with the traditional call center or traditional enterprise wiring to pull the phone. Because VCC is implemented based on IP technology, it also has the advantage of being more convenient. First of all, there is no geographical restriction on each extension. As long as the place can be connected to the Internet, employees of the enterprise can communicate with their seat number and log in as if they are at the extension. Whether it is a foreign city or a foreign country. This has obvious advantages for express companies with many branches and large enterprises.

At the same time, this system is also quite advantageous to the customer service call center with a large number of incoming calls. For example, the UU business travel use case introduced on the official website of Yuntong. UU Business Travel is a booking center. The original 4006729400 call was transferred to an ordinary telephone. It turned out that only one user could call in, and there was no recording of the quality of customer service.

In this way, the enterprise can set up its own telephone voice network immediately without having to invest in any hardware or spend many working days. Especially for 400 telephone call centers, there are revolutionary changes. The 400 telephone call center does not need to wait, do not invest in real-time activation of your own call center system.

On USB: VCC is power supply; GND is ground; DP and DM are differential signals; PORT- and PORT+ are data negative and positive signals.

Process technology

Suspended bed hydrocracking technology is an extension and development of coal high-pressure suspended bed hydroliquefaction technology. Currently, there are VCC suspended bed hydrocracking technology of VEBA Petroleum Company in Germany, Canmet suspended bed hydrogenation technology of Petro-Canada, and Eni company of Italy. EST suspended bed hydrogenation technology. At the same time, some oil companies in the United States, Japan, Venezuela and other countries have also successively developed residual oil suspension bed hydrogenation technologies. The above-mentioned suspended bed hydrogenation technologies have not been successfully industrialized except for VCC.

The VCC suspended bed hydrocracking technology originated from the Bergius-Pier coal liquefaction technology in Germany in 1913. The technology has been industrialized in Germany as early as the 1920s. During 1927-1943, 12 sets of direct coal liquefaction plants were built and successfully operated in Germany using this technology (some plants processed coal-coal tar, coal-coal tar pitch, coal-heavy oil mixture), and the total processing scale was nearly 400 10,000 tons/year, the largest plant scale is 700,000 tons/year, and the maximum operating pressure is 70.0MPa.

VCC suspended bed hydrocracking technology includes two processes, liquid phase hydrotreating (LPH) and gas phase hydrotreating (GPH). The principle is:

(1) After the raw materials are mixed with additives and hydrogen, they enter the suspended bed reactor, where the thermal cracking reaction occurs, and the hydrogen is saturated under high pressure and hydrogen. Among them, the carbon residue, gum, and asphaltene in the feed undergo thermal cracking and hydrogenation saturation under the action of specific additives, and there is basically no coke production.

(2) The products of thermal cracking in the suspended bed are separated in the hot high-pressure separator, and the clean gas products are sent to the fixed bed reactor for further hydrocracking and hydrorefining to produce high-quality naphtha and light diesel. The separated solid matter is mainly coke, which can be pelletized and used as coal.

In this way, VCC technology can solve the problem that fixed bed hydrocracking cannot operate for a long period of time:

(1) VCC suspended bed hydrocracking adopts the process of "suspended bed + fixed bed" reactor. The raw materials, additives and hydrogen are mixed and heated and pressurized to enter the suspended bed reactor. Because no catalyst is used, only It is a thermal cracking reaction under high hydrogen partial pressure. During the reaction process, the residual carbon, asphaltenes, metals, etc. in the raw materials are all adsorbed on the additives to undergo cracking and other reactions. The heavy metals and the resulting coke are finally deposited on the additives. The additives are then separated at the bottom of the hot high-pressure separator to ensure the suspended bed reaction Long-period operation of the device.

(2) Relatively clean gas products are separated from the top of the hot high-pressure separator, and then fed into a conventional fixed-bed reactor for further hydrocracking or refining, because most of the asphaltenes, carbon residues, precipitates, and metals in the raw materials are already in Removal in the suspended bed reaction stage will not have a serious impact on the fixed-bed catalyst bed and can ensure long-term operation.


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