rle

Return Link Encapsulation (RLE)

Table of content

• Return Link Encapsulation (RLE)
  • OpenSAND exploitation
  • OpenSAND software design

RLE (Return Link Encapsulation) is one of the encapsulation protocols implemented in OpenSAND. RLE is capable of carrying IP packets and Ethernet frames on top of DVB bursts.

In OpenSAND it is possible to use the RLE encapsulation in the following links:

• On the Return link, on transparent mode, with DVB-RCS2 on the return link.
• On the Uplink and Downlink, on regenerative mode, with DVB-RCS2 on the up/down link.

OpenSAND exploitation

RLE can be used when the conditions already described are met. It can be chosen from the Configuration tab in the OpenSAND Manager for the desired link (more information on the (more information on the encapsulation page).

Additional configurations specific to this protocol can be found in the Advanced configuration window, in the Plugin box (lower-left) of the GLOBAL section (see image). One parameter is available for configuration:

• alpdu_protection: Specifies the type of ALPDU protection for RLE.

RLE encapsulation in OpenSAND is implemented by the libopensand-rle-encap-plugin (and the libopensand-rle-encap-plugin-manager for the OpenSAND manager), which is not distributed with the opensand-core package. However, it is installed by default when installing the metapackage opensand (and opensand-manager for the manager plugin).

OpenSAND software design

RLE encapsulation is implemented in OpenSAND as an external plugin, which is distributed in the packages libopensand-rle-encap-plugin and libopensand-rle-encap-plugin-manager. This plugin does not implement the RLE encapsulation itself, but provides an interface between OpenSAND and the librle library, which is in charge of encapsulation/desencapsulation.

For more information about the Encapsulation design in OpenSAND, refer to the (more information on the encapsulation page.