Comtech EF Data CDM-570 - Manual (Page 443)

CDM-570/570L Satellite Modem with Optional IP Module Revision 12
Appendix G MN/CDM570L.IOM
G–7
G.3.4.2 Router Mode – Point-to-MultiPoint
Figure G-3. Router Point-to-MultiPoint Working Mode w/HDLC
Figure G-3 shows a Point-to-MultiPoint configuration (also referred to as a “STAR Network”).
The Hub CDM-570/L-IP is transmitting a common 2.048 Mbps link to THREE remote
CDM-570/L-IPs. All three remote CDM-570/L-IPs are transmitting a 256 kbps link back to the
Hub CDD-564/L IP Quad Demodulator.
Since this is a Point-to-MultiPoint configuration, HDLC addressing is used so that the traffic not
intended for a particular destination can be filtered. For Unicast traffic, it is best to associate a
unique HDLC address for each site in the network. For this case:
• The Hub Site is HDLC 0x01;
• Remote ‘A’ is HDLC 0x02;
• Remote ‘B’ is 0x03;
• Remote ‘C’ is 0x04.
Router Point-to-MultiPoint Working Mode with HDLC Addressing only applies
to CDM-570/L-IPs and CDD-564/L IPs operating with CDM-570/L-IP Modem
Firmware Version 1.6.7 or earlier.