ASI - Asynchronous Serial Interface:

The commonly used interface (standardised from DVB) for digital compressed television signals is ASI (Asynchronous Serial Interface).

This is in fact the generally used interface for the input and/or output of multiplexers, MPEG-2 coders, digital DVB-T modulators etc. The ASI interface, created for the transport of MPEG data streams (Transport Stream) is extremely flexible and can transport data at any required speed (bit-rate) between zero and over 200Mbit/s.

Aligned with these principles Elber has adopted ASI as a "transmissive mean" , guaranteeing an efficient use of the bandwidth and flexibility in the transport of SD an HD signals. The use of this technology allows hence the realisation of reliable, versatile and compact high performance solutions for fixed, semi-fixed and portable applications.

Elber adopts for the ASI interfaces of its proper equipment the philosophy of not altering the TS data to allow a transparent transport of the signal.

Not applying any restamping or remultiplexing, these equipments are compatible with any system with ASI interface and can also be used in SFN networks. Particularly the ASI RK210 realizes a completely transparent "covering" of the input signals, allowing on the receiving side the reconstruction of the original streams.

The input stream can come from different sources such as HD encoders, DVB-T multiplexers or other converters.

Significant is the case of the 4MPX/ASI converter, an innovative tool that can transport in one unique ASI 4 audio MPX signals opportunely converted and digitalized inside the device. Each audio signal undergoes a digital elaboration based on the DSP technology (Digital Signal Processor).

The output stream has an overall bit-rate of 9.6 Mb/sec.

The most important part of this production line is the digital modem DDM310, highly reconfigurable with modulations schemes adaptable in function of the required bit-rate, the level of robustness and protection, allowing an optimal use of the band.

When configured as modulator, the DDM310 receives an ASI and an E3 (2.048 Mb/sec) input signal, offering in the output an IF 70 MHz modulated signal. Vice versa, when configured as a demodulator the DDM310 regenerates the original (ASI, E1) from the IF.

The SL Slim Line production line realizes the IF-RF frequency conversion, and vice versa, in the range from 2 to 15 GHz.

The indoor Slim Line transmitter (T-SL) and Slim Line receiver (R-SL) are characterized by a compact design (rack 1U standard 19”) that does not compromise the performance of the device.

The most important features are the low group delay (<10 ns), the excellent noise figure of the receiver (< 5dB) and the double frequency conversion of the IF signal, obtaining agility values equal to 500 MHz.

With these characteristics these devices are ideal for the transport of signals in analogical as well as digital modulation.