212668-6

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212668-6 Application Field and Working Principle

The 212668-6 standard refers to the basic physical layer requirements for Integrated Services Digital Network (ISDN) user access based on copper wires and 2-wire multi-channel transmission structures, which provides the physical connection between the user terminal and the provider\'s communication network. This standard also specifies the detailed requirements for the user access on the physical layer and the interoperability of such access.

The 212668-6 standard can be applied in many ways. On the one hand, it can be used for the following Application examples:

• Private ISDN Access: This is a typical application of the 212668-6 standard in a local area network. It allows user terminals to access the public ISDN network in a cost-effective way.
• Voice over IP (VoIP): This is also an important application of the 212668-6 standard. It allows VoIP calls to be sent and received using existing copper-based ISDN access network structures.
• Integrated ISDN/ PSTN Network: The 212668-6 standard can be used to create a combined ISDN and PSTN network, which will allow users to access both services in a cost-effective way.

In addition to the above-mentioned applications, there are also many other applications of the 212668-6 standard. For example, it can be used to create an integrated ISDN/ DSL network, as well as for IP telephony applications.

The working principle of the 212668-6 is similar to that of other ISDN access network standards. In a nutshell, the 212668-6 standard provides physical layer requirements that enable user terminals to access an ISDN network using copper wires. The 212668-6 standard is mainly composed of two components - a twisted pair of copper wires and a duplex line-driver interface. The twisted pair of copper wires is connected to user terminals, such as PCs, while the duplex line-driver interface is connected to the PSTN or ISDN network.

When the user terminal transmits data, the physical layer requirements of the 212668-6 are used to encode the data and transfer it over the copper wires. At the same time, the duplex line-driver interface will send a signal to the PSTN or ISDN network to indicate the transmission and reception of data. Once the data is transmitted to the network, the network will process the data and deliver it to the destination.

In summary, the 212668-6 standard is a set of basic physical layer requirements for ISDN user access based on copper wires and 2-wire multi-channel transmission structures. It is applicable in various applications and the working principle of the 212668-6 is similar to that of other ISDN access network standards.

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