Comtech EF Data CTOG-250 - Manual (Page 219)

CTOG-250 Comtech Traffic Optimization Gateway Revision 1
Appendix D MN-CTOG250
D–5
Use the Configuration | Network | Routing page (Figure D-1) to enable or disable Header and
Payload Compression operation.
When enabled, Header Compression-supported packets are automatically identified for
compression; the only configurable settings are the Header and Payload Compression Refresh
Rates.
D.2.2 C onfiguring Header and P ayload C ompres s ion R efres h R ates
Figure D-2. Configuration | WAN | Compression page
Use the Configuration | WAN | Compression page (Figure D-2) to define the Header and
Payload Compression Refresh Rates. These settings control how many compressed header
packets are sent before a single full header packet is sent.
The supported refresh rates are based on the runtime characterization that there will be, at
most, 600 packets seen between refreshes. Additionally, even though the runtime supports
1,048,576 sessions, it is only necessary to have context storage for a small number over those
600 packets. Based on this specification, the CTOG-250’s compression performance is defined in
Table D-3 (±5% with different compression refresh rates).
Table D-3. Compression Performance
Packet Size
% Savings per Compression Refresh Rate
1 25 50 300 600
40 23% 50% 53% 53% 55%
420 40% 51% 51% 51% 51%