Advanced Quality Of Service (Qos; Table D-1. Aldc Vs. Lzs Compression Comparison - Comtech EF Data CDM-570A Installation And Operation Manual

CDM-570L/570AL Satellite Modem with Optional Packet Processor
Appendix D
Payload
Algorithm
ALDC
D.1.2.8 Advanced Quality of Service (QoS)
Appendix L. ADVANCED QUALITY OF SERVICE (QoS)
Advanced Quality of Service (QoS) is an optional feature of the Packet Processor. Advanced QoS
enables a network to use WAN bandwidth more efficiently by managing delay, jitter (delay
variation), throughput, and packet loss. It is based on OSI model to Layer 7 protocol header
parameters. Advanced QoS requires that the optional Packet Processor is installed and active,
and requires that you purchase and activate the Advanced QoS FAST Option. Contact Comtech
EF Data Product Support for further information.
The CDM-570A/570AL-IP incorporates four Per Hop Behavior (PHP) QoS modes of operation:
•
Max/Pri Mode – QoS Rules based on Maximum Bandwidth and Priority.
This mode provides multi-level traffic prioritization with the ability to limit maximum traffic
per priority class.
•
Min/Max Mode – QoS Rules based on Minimum and Maximum Bandwidth.
This mode provides a Committed Information Rate (CIR) to each user-defined class of traffic
with the ability to allow a higher burstable rate depending on availability
•
DiffServ Mode – Differentiated Services.
This mode incorporates the industry-standard method of providing QoS, enabling seamless
co-existence in networks that implement DiffServ.
•
VLAN Priority Max Mode – VLAN 802.1q
When using rule-based QoS, you can configure up to 32 different rules based on:
• Source IP address and subnet mask;
• Source Port;

Table D-1. ALDC vs. LZS Compression Comparison

File Set
size
1472
1000
Calgary
500
100
1472
1000
Canterbury
500
100
Ratio Algorithm
1.76
1.76
1.77
2.09
LZS
1.71
1.72
1.74
2.04
D–18
MN-CDM570A
Payload
File Set Ratio
size
1472 1.66
1000 1.66
Calgary
500 1.68
100 1.97
1472 1.61
1000 1.62
Canterbury
500 1.63
100 1.91
Revision 3