Operation Manual

SFX SERIES USER’S GUIDE
Rev 2.2 36
Figure 2- 11 Edit Selected Channel
The following fields can be edited on the Edit Selected Channel page:
Edit Field Description
State Select from drop down table between:
Disabled, or
Network Stream, Audio, Video
Forward Allows the data corresponding to the channel guide entry to be forwarded out one or both of the
receiver’s Ethernet ports. In the case of audio, the receiver can play the audio as well as
forwarding it.
Data Delivery
Data Delivery functionality is the heart of the receiver. When the Data Delivery Tool Bar item is selected, a submenu
page appears which provides menu items relating to the routing, filtering, firewalling, address translation and output of
data on the receiver interfaces. These are described in the following paragraphs.
In order to understand how the various data delivery functions work, you should understand the path IP packets will
take as they are processed by the receiver. This data flow is demonstrated in the Data Flow Diagram of Figure 2- 12.
In this flow IP packets originate from two primary sources: the satellite interface (sat0) after PID Filtering and MPE De-
encapsulation, or the network (LAN) interfaces.
As shown in Figure 2- 12, the receiver processes IP packets that enter, leave and pass through it. There is a chain for
each of these paths. Any packet entering the receiver goes through the PREROUTING and INPUT chains. Any
packet that the receiver sends out to the network goes through the OUTPUT and POSTROUTING chains. Any packet
that the receiver picks up on one network and forwards to another goes through the FORWARD chain.
Many of the menu items available under Data Delivery maintain tables that allow you to set up certain rules that govern
the treatment of packets of data that pass through each of these chains. With every packet, the rules in the
appropriate table in the chain are checked to see if any of them match. The first rule that matches decides the
outcome for that packet. If none of the rules match then the default rule or policy of the whole chain will be the final
decision maker.
NOTE:
Channels
coloured red
can NOT be
edited.