Comtech EF Data CDM-840 Especificações descarregar pdf (Página 236)

CDM-840 Remote Router Revision 2

Appendix G MN-CDM840

G–4

G.2.1 Process Overview

Figure G-3. RAN Optimization (GSM Abis Interface)

On the transmit side, the process for RAN Optimization is summarized as follows:

• The incoming 64 kbps Time Slots are de-multiplexed into Traffic Channels (TCH) ;

• TCH are inspected in real-time to identify Signaling, Voice, Data, and Idle;

• Idle TCH are removed;

• Silence frames are removed from the Voice channel;

• Signaling and Data TCH are compressed using lossless compression;

• O&M frames are compressed using lossless compression;

• Voice frames are compressed using lossless compression;

• Pre-emptive Bandwidth Management to maintain service quality;

• The optimized payload is sent to the modem for transmission.

On the receive side, this process is reversed, re-creating the E1 for transmission over the G.703

E1 interface.

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