Comtech EF Data VMS v3.12.x Vipersat - Manual (Page 249)

Chapter 4 - Configuring Network Modems 4-31
MN/22156, rev 12 Network
Mode
Select the mode of QoS operation to be used for this group from the pull-down
menu: Off, DiffServ, Max/Priority, or Min/Max.
ModCod
Select the ModCod to be used for this group from the pull-down menu.
If only one group is defined (Default Group), the selection for this parameter
will also appear for the ModCod setting in the Mod dialog (see “ModCod” on
page 4-60).
Members
The mapping of packets to QoS group is based on the subnet addresses that are
defined here. If a packet doesn’t match any of the defined groups, it will be
assigned to the “Default” group.
Specify the Remote site(s) that will be included in the group.
Click the Add button and enter the subnet address and number of bits.
Existing members can be selected from the list and either modified or deleted.
Rules
The Rules table that appears on the right side of the group properties dialog lists
the QoS rules to be applied for this group. These rules govern QoS for traffic
transmitted to the Remotes on the DVB-S2 TDM outbound carrier.
This feature is relevant for QoS modes Max/Priority and Min/Max bandwidth.
When DiffServ mode is utilized, the rules are predefined and do not need to be
created here.
The QoS mode that is chosen will determine the settable parameters for defining
QoS rules for the CDM-840 Remotes. While developing the QoS Rules to be
applied to the unit, the type of traffic the modem is expected to handle must be
considered.
QoS Rules can be assigned to up to 32 different types of flows defined by the
user. Flows can be defined by any combination of Protocol (FTP, UDP, RTP,
etc.), Source/Destination IP (specific or range), and/or Layer 3 Source/Destina-
tion Port.
QoS Rule Hierarchy
It is quite possible to have traffic that meets the definitions of several QoS
Rules. All traffic will be classified into the first QoS Rule that is a match, or fall
into the Default Rule. The most specific QoS Rule will always be first. For
example, a QoS Rule that identifies a Source and Destination IP Address will be