DIN-6235 is a device for concatenation four E3
signals coming from four different sources. (MPEG
Encoders, Digital Studios, ...) into an E4 signal.
This device provides very efficient using of a
telecom network (Microwave of Fiber) for
transmitting a large number of services from
different sources. Its best used for SDH links which
have E4 interface since for E3 signals will be
inserted into the output STM-1 which is more than
the tree E3 places designed for direct mapping.