Broadband PNG Transparent Images

Submitted by on Apr 14, 2021

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In telecommunications, broadband is a wide bandwidth data transmission that transports various signals and types of traffic. This can be a coaxial cable, fibre optic, radio, or twisted pair.

In the context of broadband Internet access, any high-speed Internet access is used that is always on and faster than dial-up access to traditional analogue or ISDN PSTN services. Different “general” criteria apply in different contexts and at other times. Its origins lie in the physics, acoustics and engineering of radio systems, where it was used in a meaning similar to “wideband”, or in the context of sound cancellation systems, where it stood for single-band rather than multiple comparator audio-range systems. Later, with the advent of digital telecommunications, the term was mainly used for multi-channel transmission. Although the passband signal is also modulated to occupy higher frequencies (compared to the base signal connected to the lower end of the spectrum, see Line Coding), it still occupies one channel. The key difference is that what is generally considered to be a wideband signal in this sense is a signal that spans multiple (non-masking, orthogonal) bands, which allows for a much wider single carrier bandwidth, but with added complexity in the circuit receiver/transmitter.


The term became popular in the 1990s as a marketing term for Internet access faster than dial-up access, the original Internet access technology whose maximum bandwidth was limited to 56 kbps. This meaning is only distantly related to its original technical purpose. In telecommunications, broadband signalling is a technique that handles a wide range of frequencies. “Broadband” is a relative term that is understood in its context. The wider (or broader) the channel’s bandwidth, the higher the data throughput for the same channel quality.

For example, in radio, a very narrow band will transmit Morse code. A wider broader band will transmit speech, and an ever wider broader band will carry music without losing the high frequencies needed for realistic sound reproduction. This wide bandwidth is often divided into channels or “frequency blocks” using passband techniques to provide frequency division multiplexing instead of sending a higher quality signal.

When transmitting data, the 56k modem will transmit at 56 kilobits per second (kbps) over a 4-kilohertz telephone line (narrowband or voice voiceband). In the late 1980s, in the Broadband Integrated Services Digital Network (B-ISDN), the term was used to refer to a wide range of bit rates, regardless of physical modulation details.

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