The importance of protecting VoIP-VoIP, IP, modem - HC network broadcasting industry

The importance of protecting VoIP-VoIP, IP, modem - HC network broadcasting industry

Or Internet telephony refers to the Internet (rather than the public switched telephone network, which PSTN) transmission of communications services?? Voice, fax and / or voice, information applications. Send Internet phone calls are the basic steps involved, including the analog voice signal into a digital voice signal and the signal compressed into Internet Protocol (IP) packets for transmission via the Internet, the receiving end of these steps are just the opposite. Because it is run on the Internet, so VoIP telephone has a very low cost, the only cost is the cost PNET. It will become the world's IDD areas of long-distance calls very common means of transmission.

Recently, VoIP generally use ITG (Internet Telephony Gateway) / VoIP gateway via IP to transmit voice. VoIP gateway with the following several ports.

FXO (Foreign Exchange Office): It is a direct link to the two-wire PSTN ports.

FXS (Foreign Exchange Station): It is through the RJ-11 handset plug hole and Terminal Equipment Connected, such as regular phone.

Ethernet port: RJ-45 port through it to connect to the PC or xDSL Modem On.

USB port: it is to connect an external USB device, such as card reader, 3GHSDPA cards, flash memory, etc..

power port: it is usually 12V external power input port.

Mainstream VoIP Support single / dual channel FXS, and also appeared on the market access as many as 30 in the FXS. VoIP is the latest development with the built-in routers and Wi-Fi connectivity, VoIP via wireless network to xDSL wireless connectivity, thereby enhancing their access point mobility within the coverage area. And there are the POE (Power over Ethernet) into the trend, so no external power supply can drive VoIP.

Since these ports is connected with the outside world events when there have been surges, and the ITE IT equipment is connected to the telecommunication needs of the telecom network management standards, it had to use protective devices to protect these ports.

Each country has its own safety standards, such as the United States TelecordiaGR1089-Core and UL60950, internationally accepted ITU-TK.20/K.21 (International Telecommunication Union) and China YD/T993, 950 standard. Different standards for the protection of devices, technologies and topologies have different stability conditions. By comparison we found, consistent with U.S. standards of protection than the device's ability to meet the International Telecommunication Union standards to withstand the high, more than meets the high standards of China. In most cases, comply with U.S. standards of protection solutions can basically set the standard by ITU-TK.2x most Test Conditions.

Order to design the most appropriate solution for VoIP protection, to understand the various surge protection devices protect the voltage levels and it is important. Common surge voltage level as shown in Table 1

Several solutions 1SLIC (subscriber line interface circuit) protection

one-way fixed-voltage protector (SIDACtor) + PTC Figure 2 one-way fixed-voltage protection device with the PTC

Which, overvoltage (OV) protection by working voltage is-90V for P1101DF-1 (one-way fixed-voltage Protection devices); over-current (OC) protection using 250S130

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