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CDM-750 Advanced High-Speed Trunking Modem
Ethernet Network Configuration
This configuration allows for multiple customer Ethernet interfaces. The 10/100BaseT management
port is connected to a switch that interfaces optionally with the data traffic switch and the M&C
controller. Normally, the management port is configured so that management traffic is physically
separated from the data traffic ports. However, it is possible to enable operation so that management
traffic may pass with the data through the data traffic ports and WAN interface.
It should also be noted that additional care must be taken to avoid Ethernet Networking Loops as
defined in Sect. 9.3.1. Specifically, the network operator must make sure to avoid connecting multiple
ports of the CDM-750 to the same external Ethernet switch, as shown in Figure 9-3.
9.4.2 Ethernet Overhead
After Ethernet packets are sent from the internal switch to the modem WAN interface, Generic
Stream Encapsulation (GSE) is used and overhead is <1%.
Figure 9-3. Improper Use of External Switch with CDM-750
Figure 9-2. CDM-750 Ethernet Architecture Design
9–3
Revision 1
MN-CDM750
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