What Is V.22?

When you're having a conversation with someone? Do You think that is what you want to be able to do? Hold up your end of the conversation, of course. You want to listen and then respond. You don't want to wait while they finish their sentence before you can say anything back. You want them to avoid cutting in mid-sentence so they can get the last word in! Now imagine that same scenario but with two people on the line simultaneously. V.22 was designed for full-duplex communication between two analog dial-up modems using phase-shift keying modulation at 600 baud (1,200 or 600 bits per second).V.22 is a standard for non-data as fax, modem-to-modem calls, and computer voice/modem communications. It was created in 1992 and was the first recommendation that allowed both directions of communication to happen simultaneously, significantly reducing latency. It is widely used in fax machines and modems. The CCITT developed the V.22 standard in 1980 to replace their earlier V.21 protocol which was limited to 300 bps speed. The V.22 standard uses a Gaussian minimum shift keying (GMSK) modulation technique to achieve higher rates but at the cost of poorer noise immunity than other modulation techniques, such as quadrature amplitude modulation (QAM). V.22 is an olden standard that enables duplex operation on two-wire GSTN and point-to-point leased circuits. It includes test facilities and scramblers, which are pretty cool. It uses frequency division for channel separation, meaning each modem can transmit at 600 bauds (bits per second). The modems use differential phase shift modulation to create every channel with synchronous line transmissions at 600 bauds.V.22 modems! Here's how it works: Every bit is encoded as a phase change relative to the phase of the preceding signal elements. Do you know what that means? It means we're talking about data transmission, baby! In this case, we're talking about high-speed data transmission.