Comtech EF Data CDM-710G - Manual (Page 62)

CDM-710G High-Speed Satellite Modem Revision 1
Ethernet Network Configurations MN-CDM710G
3–10
3.3.6 Hub-to-Remotes, Split-path Traffic using Routers (Point-to-Multipoint)
Figure 3-10 shows hub-to-remotes configuration with standard and split-path Ethernet traffic, using
routers. A Static ARP Entry is needed in the switch so that routing of the Tx side of the modems will
be on the correct port of the router. For example, the Rx side of the Ethernet connection for ‘Traffic
Modem #N’ comes in the bottom port of the Router, but the Tx Ethernet connection must be
connected through the same port as ‘Traffic Modem #1’, as shown in this figure.
Figure 3-10. Point-to-Multipoint using Routers
A wired-thru Ethernet redundancy example is shown in Figure 3-11. When the CRS-300 1:10
Redundancy Switch backs-up a faulted Traffic Modem, the physical port on the router does not
change, because the Ethernet connection is properly rerouted within the CRS-300 from the
Traffic Modem to the Redundant Modem.
A wired-around Ethernet redundancy example is shown for the CDM-710G user in Figure 3-12.
When the CRS-300 1:10 Redundancy Switch backs-up a faulted Traffic Modem, the physical port
on the router needs to change from the Traffic Modem port to the Redundant Modem port.
Because of this, special router configuration is required for successful operation – the user may
need to consult with the router manufacturer.
IMPORTANT
The wired-around redundancy approach is
not recommended.