Comtech EF Data CDM-570 - Manual (Page 222)

CDM-570/570L Satellite Modem with Optional IP Module Revision 12
Ethernet IP Module Interface MN/CDM570L.IOM
13–16
Expedited Forwarding (EF) DSCP – This defines premium service and is recommended for
real time traffic applications such as VoIP and video conferencing.
Assured Forwarding (AF) DSCP – This defines four service levels and also uses the last three
bits of the DSCP to define the Drop Precedence (Low, Medium, or High). The Drop Precedence
determines which packets will most likely be dropped during periods of over congestion, similar
to Weighted Random Early Detection (WRED). As a result, each of the four AF service levels
also have three Drop Precedence levels for which the IP Module provides 12 separate queues.
Minimum Bandwidth (AF only) – Minimum specification that allows a committed information
rate (CIR) to be applied to user-defined classes of traffic, or the default of no minimum
bandwidth can be selected.
Maximum Bandwidth (AF only) – This can be assigned to a flow to restrict the maximum
bandwidth that any particular flow will utilize, or the default of no bandwidth restriction can be
selected.
1. Minimum and maximum bandwidth is only configurable for each of the four
Assured Forwarding classes.
2. Typically, DiffServ is implemented using exclusively Class Selector DSCP
or exclusively Expedited and Assured Forwarding DSCP. The IP Module is
fully DiffServ compliant and will work with either DiffServ implementation,
or with a combination of both.
13.5 IP Module Specifications – Supported RFCs and Protocols
Supported RFC Protocol
RFC 768 User Datagram Protocol RFC 791 Internet Protoco7l
RFC 792 Internet Control Message Protocol RFC 793 Transmission Control Protocol
RFC 826 An Ethernet Address Resolution Protocol RFC 856 Telnet Binary Transmission
RFC 862 Echo Protocol
RFC 894 A Standard for the Transmission of IP Datagrams
over Ethernet Networks
RFC 959 File Transfer Protocol RFC 1112 Host Extensions for IP Multicasting
RFC 1213 Management Information Base for Network
Management of TCP/IP-based internet: MIB-II
RFC 1812 Requirements for IP Version 4 Routers
RFC 2045 Multipurpose Internet Mail Extensions (MIME) RFC 2236 Internet Group Management Protocol, Version 2
RFC 2474 Definition of the Differentiated Services Field (DS
Field) in the Ipv4 and Ipv6 Headers
RFC 2475 An Architecture for Differentiated Services
RFC 2578 Structure of Management Information Version 2
(SMIv2)
RFC 2597 Assured Forwarding PHB Group
RFC 2598 An Expedited Forwarding PHB RFC 2616 Hypertext Transfer Protocol – HTTP/1.1
RFC 2821 Simple Mail Transfer Protocol
RFC 3412 Message Processing and Dispatching for the Simple
Network Management Protocol (SNMP)
RFC 3416 Version 2 of the Protocol Operations for the Simple
Network Management Protocol (SNMP) RFC 3418 Management Information Base (MIB) for the Simple
Network Management Protocol (SNMP)