Comtech EF Data CDM-570A - Manual (Page 569)

CDM-570A/570AL Satellite Modem with Optional Packet Processor MN-CDM570A
Appendix L Revision 2
L–9
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 Packet Processor is
fully DiffServ compliant and will work with either DiffServ implementation, or
with a combination of both.
WRED – The QoS system supports WRED-based congestion avoidance. WRED can be enable or
disabled on any queue. When WRED is disabled, upon overdriving the queue the packets will be
tail dropped.
L.1.3.1 DiffServ QoS Mode Example
Do these steps:
1. Select DiffServ QoS mode.
2. Set the modem Tx bandwidth to 10 Mbps.
3. The input streams to the modem are as follows:
Stream Priority PHB / DSCP Code Service Rate Drop Precedence Data Rate
Management 1 CS7 / b111000 NA NA 200 Kbps
Networking Control 2 CS6 / b110000 NA NA 800 Kbps
Voice 3 EXFD / b101110 NA NA 1Mbps
Video 3 CS5 / b101000 NA NA 4 Mbps
Data-1 4 CS4 / b100000 NA NA 550 Kbps
Data-2 5 CS3 / b011000 NA NA 1450 Kbps
Data-3 7 ASFD4 / b100010 100 low 1 Mbps
Data-4 7 ASFD3 / b011010 400 low 1 Mbps
Data-5 7 ASFD2 / b010010 500 low 1 Mbps
Data-6 7 ASFD1 / b001010 800 low 1 Mbps
Data-7 8 BE / bXXXXXX NA NA 2 Mbps