ND SatCom SKYWAN IDU 7000, Manual

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2010-10-26 Network Design and Engineering Guide 127
Data Networking
SkyWAN
®
Frame Relay Networking Features
4.3.3 FR Communication Services and Quality of Service
Sky WAN
®
networks supports 3 different generic Frame Relay communication services:
- Realtime
- Realtime Dynamic
- Non-Realtime
Besides these generic services there is also a special communication service Sky WAN
®
FAD
if the device type connected to the IDU serial port is a Sky WAN
®
FAD. The communication
service may be defined for the entire serial port as part of the port configuration or for an indi-
vidual PVC.
Sky WAN
®
FAD service can only be configured for the entire port.
The communication service defines how packets received on the individual PVCs are forward-
ed to the satellite link. The following figure 4-10 describes the mapping of communication serv-
ice to Frame Relay transmit queue on the IDU.
Figure 4-10 Mapping of FR Services to Transmit Queues
There are two transmit queues for Frame Relay user traffic for each satellite carrier on the IDU:
- FR Realtime
- FR Non Realtime
The FR Control queue is reserved for the internal node status messaging of the IDUs. Packets
received on PVCs defined for Realtime or Realtime Dynamic Service will be forwarded via the
FR Real time queue. Packets received on Non-Realtime PVCs will be forwarded via the FR
Non Real Time queue.
For FR Realtime Services
-
the required bandwidth must be allocated as streaming slot capacity;
- the streaming bandwidth will be requested permanently at activation time according to the
configured Committed Information Rate of the PVC.