The Newtec AZ820 is an interface adapter designed to take an MPEG transport stream over an ASI interface and convert it into a
transport stream over a G.703 interface, or the other way around. This conversion enables the transmission of transport streams over E1, E2, E3, T1, T2, T3/DS3 digital carriers.
For example, the AZ820 converter is ideal for Digital Terrestrial and Mobile TV transmission networks when video/data signals have to be carried over fixed or microwave links between the hub and each remote broadcasting site. In its default configuration the AZ820 performs the ASI to G703 conversion. On the input side, the data converter allows automatic or manual selection between two DVB-ASI-coax inputs or a DVB-SPI input. One of the Electrical ASI interfaces can be optionally replaced by an optical interface.
The rate of the input signal is adapted by adding null packets in order to match the rate of the digital carrier. Program Clock references (PRC) are restamped accordingly.
At the output, the signal rate can be slaved either to an internal clock, or to an external G.703 output clock. Optionally, a secondary G.703 interface with a specific data rate can be installed, giving the possibility to switch from one rate to another.
Optionally, the AZ820 can be confi gured to perform G.703 to ASI conversion.
If the MPEG signal needs to be transported without any modifi cation, such as for the distribution of signals in a Single Frequency Network (SFN) , a special transparent mode can be activated. This guarantees that the transport stream at the ASI output of the G.703-ASI converter is bit-by-bit identical to the original input of the ASI-G.703 converter. In addition, when in transparent mode, we do not restamp the PCR value, nor delete incoming null packets.
The AZ820 is easy to operate and monitor. All control and monitoring parameters are available locally on the front panel and remotely through a web interface. It is also possible to control or monitor the AZ820 via RMCP or SNMP
AZ820 Key Features
Rate adaption (for MPEG transport stream)
Two selectable ASI inputs
ASI Byte and Burst mode compatible
Optical ASI interface (optional)
G.703 interface: E1, T2, E2, E3 or T3 (DS3) rates
Secondary G.703 interface
Adaptive equalizer on G.703 interfaces
Flexible conversion between broadcast and telco standard