Skywan ® Fad Service; Fad 'Class 7' Traffic; Traffic Shaping And Congestion Management - ND SatCom SKYWAN IDU 7000 Manual

Data Networking
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SkyWAN Frame Relay Networking Features
For FR Realtime Dynamic services
- allocation will happen when the first user packet is received on the PVC. If no user packets
are received for a configured timeout period, the capacity will be automatically released. If
the necessary streaming capacity cannot be allocated due to carrier congestion, the Real-
time PVC will be declared inactive, user traffic will then be discarded at ingress.
Note: If the serial port type is defined as isochronous FRAD, the communication service must
be Realtime. In this case the allocated streaming bandwidth will be derived from the configured
port speed.
4.3.4 SkyWAN
In contrast to the generic Frame Relay services, the SkyWAN
of realtime and non realtime services on a single PVC. This is possible because the SkyWAN
IDU can interpret the proprietary network link protocol used to interconnect SkyWAN
over FR PVCs.
This allows the SkyWAN
- Packets carrying voice traffic will be forwarded via the FR Real Time queue, whereas pack-
ets other than voice traffic will be forwarded over the FR Non Real Time queue even if both
packets are received on the same PVC.
- If a voice call setup is signaled by a FAD, the SkyWAN
ficient streaming slot bandwidth for the signaled voice codec. If a call disconnect is signaled
the streaming capacity is automatically released.
In addition to voice traffic, transparent data traffic between FAD serial ports may also be trans-
ported as realtime traffic. In this case the configured serial port speeds on the FAD determines
the allocated streaming bandwidth.

FAD 'Class 7' traffic

FR data traffic configured as 'Class 7' on the FAD serial port will be forwarded into the Sky-
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WAN IDU FR real-time queue and thus transferred as FR real-time traffic. SkyWAN band-
width assignment for this data service is optimized for a PDU size of 48 octets (FAD default
value) considering the entire overhead. It is recommended that this default PDU size for 'Class
7' traffic is not changed.
Due to the implemented optimization the required bandwidth for 'Class 7' traffic has to be cal-
culated by:
- required bandwidth = traffic bandwidth * 1,29.
4.3.5

Traffic Shaping and Congestion Management

Traffic shaping may be enabled on each serial port. If enabled, the received traffic data rate for
each PVC will be measured and compared with traffic policy parameters configured for each
PVC. If more traffic than allowed is received on a PVC, packets may be discarded at ingress
(policy discard). The following traffic policy parameters may be defined on a PVC:
- Committed Information Rate (CIR)
128
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FAD Service
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IDU the following functionalities:
Network Design and Engineering Guide
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FAD service allows a mixture
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IDU will automatically request suf-
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FADs
2010-10-26