Comtech EF Data MDX420 SkyWire Manual - Manual (Page 111)

MDX420 SkyWire™ Satellite Network Gateway SkyWire QoS
MN-MDX420 Revision 6 C–1
Appendix C. SkyWire Quality of
Service
C.1 Introduction
SkyWire provides the same Quality of Service functionality as many commercially available QOS
switches costing hundreds of dollars. The four prioritized queues and programmable ingress and
egress policies give network administrators the ability to control how the various types of real-time
and non real-time services flow through the network. And because all of the QOS determinations
and queuing are performed at line speed, there is no additional delay through the network.
C.2 The Relationship Between IP and Other Protocols
Despite being a layer 2 Ethernet device, SkyWire provides Quality of Service functionality that
works at layer 3, the IP level. Processing IEEE tags when they are available and interpreting the
QOS information inherent in the IP header when they're not.
Protocol Relationships
Telnet FTP TFTP
TCP UDP
. . .
Internet Protocol ( I P )
Local Network Protocol
. . .
This IP level functionality is compatible with various methods of implementing QOS including:
 The use of an optional IEEE 802.3ac tag containing IEEE 802.1p priority information
 The Type of Service field or Differentiated Services field contained in an IPv4 header
 The Traffic Class field (RFC 2460) contained in an IPv6 header