The transformation of submarine cable communication is constrained by several aspects: First, the original end machine is a carrier device, and its components, especially the end of the voice, are increasingly degraded. However, today's world carrier communication has gradually withdrawn from the life stage, and maintenance and update of carrier devices Especially large-capacity carrier equipment) is impossible; second, the transmission system of the submarine cable is a single-cable dual-band system. Although the cable itself has a wide bandwidth, the steep band-pass filter of the underwater amplifier limits the communication frequency band; and under the existing conditions, it is technically and economically feasible to redesign and replace the underwater amplifier They are all very small, and the premise of the transformation is to still use the underwater analog transmission part of the current system; third, new services need to be digitized, such as program-controlled digital networking, data transmission, etc. How to improve the original communication service quality and add new services within the limited bandwidth is the first question to be considered.
In the transformation, the mixed communication mode of digital and voice separation is adopted, that is, the voice part uses the multiplex conversion device TMUX to interface with the land digital part. This hybrid communication method is particularly suitable for submarine cables, because submarine cables often use a dual-group down conversion method.
Carrier equipment is not easy to update and repair, and voice transmission decided to adopt an analog system. To interface with the digital voice part on land, you have to find alternative products. According to the new requirements of comparison and program-controlled digital networking, it is a good choice to use the multiplexing conversion device TMUX.
TMUX uses digital signal processing technology to convert the multiplexing stages of FDM and TDM signals to each other, which can avoid the reduction of group channel signals into voice channel signals, thereby reducing cost and volume, and improving reliability. Moreover, with the withdrawal of the local analog network, the source of the device is not a problem. The waveform synthesis at the transmitting end completes the function of the transmitting filter (basic waveform formation), and the digital filter at the receiving end plays the role of matched filtering.
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