The "Encapsulation" is selected according to the stipulation of how the input data stream has been
encapsulated by the transmission equipment. In RTP mode, every data packet must be provided
with an RTP header. This header contains numbering for the individual transmitted Ethernet fra-
mes in order to detect and possibly re-sought Ethernet frames which have been lost or have arri-
ved in the wrong order on the receiver. Error correction is not included in the RTP header (RTP:
can only receive RTP frames/UDP can receive both but cannot use the RTP header).
The "Datarate" line is used to input the data rate of the data stream which is to be received. This
input may never be smaller than the value which is actually to be received, since otherwise pictu-
re interference/failure would occur.
A data stream can arrive with a CBR (Constant Bit Ratio) in the U 261 Gateway, or with a VBR
(Variable Bit Ratio). In any case, CBR is used for MPTSs (Multiple Program Transport Stream) but
also for SPTSs (Single Program Transport Stream). However, SPTSs can also be sent with a VBR.
Under "Packet Mode", it is possible to select between "continuous" or "burst" for configuring the
respective ASI outputs connected downstream of the IP RX.
The TSIDs and ONIDs are displayed for information purposes in line with the selected transport
stream and, to provide a better overview of the transport streams (see also figure 11), it is possi-
ble for an alias to be input. If no alias is input, the name of the first service of the transport stre-
am is entered.
16
User Guide
U 261
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