Comtech EF Data CDM-840 Especificações descarregar pdf (Página 211)

CDM-840 Remote Router Revision 2

Appendix D MN-CDM840

D–5

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

64,000 Tx compression sessions, it is only necessary to have context storage for a small number

over those 600 packets. Based on this specification, the CDM-840’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%

800 46% 53% 53% 53% 53%

1200 49% 54% 54% 53% 54%

1472 50% 55% 55% 55% 55%

While some compressed header traffic can be lost during deteriorated satellite link

conditions, the CDM-

840 tries to minimize that when Adaptive Coding and

Modulation (ACM) is enabled (Figure D-3). Sending a full packet allows the return

of the traffic stream; you may increase the Refresh Rate (smaller value) when poor

satellite link c

onditions are prevalent or, conversely, decrease the rate (larger

value) under clear sky condition operations.

Figure D-3. Configuration | WAN | MOD | ACM page

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