Today's most popular and affordable means of organization of telecommunications remains a channel E1 / G.703 (2,048 Mbit / s), which, among other things, can be used to deliver the sound from the studio to the transmitter. To do this you must convert the audio signal into digital form and to "pack" it into a stream of El, and then do the reverse conversion. In E1 channel can accommodate stereo sound without compression of audio data, it takes about 1.5 Mbit / sec. Also via E1 can send multiple stereo program: for compression in the ISO / MPEG 111 723 (Layer 2) is sufficient to have 256 kbit / s for the program. In the channel remains valid for more information RDS-encoder, command and data management transmitter complex. To transfer audio broadcasting programs and additional data communication channels in E1 by Digiton SYSTEMS (St. Petersburg) has been developed and successfully put into operation equipment DIGILINE.

These simple to use and ready-to-work units provide the audio signal compression standard MPEG ISO / IEC 11 723 Layer 2 or no compression. Equipment is DIGILINE highly specialized equipment, it was developed specifically for audio, but because today is the standard in the construction of lines of STL (Studio Transmitting Link), as it provides the highest quality sound and minimal distortion in the conversion. 13 Depending on the modification of equipment DIGILINE it can be used to organize the transfer from one to four stereo signals. In this case the transmission of a signal from the user have the choice to pass it in uncompressed or compressed. 13 of the first case, the signal will take about 1,5 Mbit / s, the second from 256 kbit / s and higher for the program. To connect sources and consumers of sound signals is symmetric DIGILINE analog and digital inputs and outputs AES/E13U. When you pass one or two signals codecs work in full duplex mode, and with more to give to work a couple of encoder / decoder.