Comtech EF Data CDM-840 - Manual (Page 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.