Page 75 - Eurotek Catalogue

BOARD PLUG-IN ek-nae/3

“Network ADAPTER”

The EK-NAE/3 board is a 2 ASI to E3 transparent
multiplexer/network adapter, and E3 to 2 ASI network
adapter/transparent demultiplexer (see EK-NAE/3 block
scheme). It is composed by two physical input
represented by the two input BNC connectors located in

the board panel (see EK-NAE/3 board panel Features
description),
plus two internal inputs that are directly connected with  E3 to ASI & ASI to E3
the Mainframe by the internal connections matrix line Adapter
(see EK-MFR/2 user’s manual). The same composition
is mirrored for the other way. All the TS inputs are  4 different ASI input
 Bypass output function
interfaced with the VC mapper unit, the transport stream  Complete web
present on a particular input can be mapped to one of the management
four Virtual Channels (VC1 ÷ VC4) of the VC mapper.
If an input is not used it can be connected by the menu to
the waste container. After the mapping procedure
between the input transport streams and the desidered Applications

Virtual Channels, an unique stream is generated. After  Digital Microwave Links
that optionally it is possible to add RS correction code  DTV, DVB-T, DVB-S
bits, the insertion of the RS encoder limits the bit rate
capability of the system.
The next step is to serialize the stream at the fixed bit
rate of the E3 output port.

On the other way the incoming E3 signal is clock
recovered and then deserialized, the optional RS decoder
performs the error correction and then the demapper unit
extracts the packets for each output. The architecture of
the system permits to use the processed TS for SFN
network because never in the chain of the incoming

packets is modified and anyway the time position of the
packets at the outputs of the transparent demultiplexer is
related to the inputs.