Comtech EF Data MDX420 SkyWire Manual - Manual (Page 25)

MDX420 SkyWire™ Satellite Network Gateway Introduction
MN-MDX420 Revision 6 1–9
1.5 IP Ethernet Data Port
The IP data interface on the MDX420 is a dual port 10/100/1000 Ethernet bridge operating at the data link
layer (layer 2). Refer to Appendix C for technical overview of the Gigabit Ethernet Bridge interface.
IP Data Ethernet interface supports:
 Automatic learning & aging (stores forwarding database)
 Auto
Crossover
 Auto
Polarity
 Auto Negotiation (Flow control)
 Embedded Quality of Service
 CRC Control
For the Ethernet Bridge interface to operate in a normal condition, there is nothing to configure, simply
connect to one of the ports on the back panel.
The Ethernet Bridge interface allows all higher level protocols like IPv4, IPv6, DHCP, UDP, TCP, HTTP,
and FTP to pass transparently.
1.5.1 Quality of Service (QoS)
Most networks are comprised of various types of real time and non real time services. SkyWire offers
basic layer 2/3 QoS control, allowing the user to prioritize data queues ensuring that higher priority traffic,
like voice and network control, are not backed up behind lower priority traffic. SkyWire also supports
queuing features that allow the user to prioritize queuing in different ways.
SkyWire Quality of Service (QoS) features includes:
 Normal - Uses the following formats (IEEE 803.3ac Tag containing IEEE 802.1p priority
information provided by an external device, Type of Service field (RFC 791) or Differentiated
Services field (RFC 2474) contained in an IPv4 header and Traffic Class field (RFC 2460)
contained in an IPv6 header.
 Port Based - In this mode, physical port (J3) has the highest priority and physical port (J4)
has the lowest priority. The Port Based priority overrides any other priority
SkyWire QoS QUEUE features include:
 Fair Weighted - Selects the queue weighting of 8,4,2,1 allowing higher priority traffic to pass
through more quickly and insures even the lowest priority traffic gets some bandwidth.
Packets are processed in a weighted round robin manner with 8 having the highest priority.
 Strict Priority - Ensures that the higher priority traffic will always be transmitted before any
lower priority traffic. With this setting, higher priority traffic will be immediately transmitted
until the buffer is empty starving all lower priority traffic until upper priority traffic is cleared.