Comtech EF Data CDM-710G - Manual (Page 55)

CDM-710G High-Speed Satellite Modem Revision 1
Ethernet Network Configurations MN-CDM710G
3–3
3.3.2 Ethernet Redundancy with CRS-300
After the customer has determined the best configuration for near-to-far end Ethernet networks,
the CRS-300 1:10 Redundancy Switch may now be added to one or both ends of the link(s).
Ethernet redundancy using the CRS-300 can be accomplished using a wired-thru or
wired-around configuration.
3.3.2.1 Wired-thru Connection
IMPORTANT
This redundancy approach is the
recommended and preferred
connection method.
The wired-thru Ethernet connection on the CRS-300 is the easiest and simplest choice for Ethernet
redundancy. This connection method – the same as used on the standard serial data interface –
provides a single connection for the User Data Interface and provides simple Form-C relays that
route the Ethernet connection from the user connection to either the Traffic or Redundant Modem.
3.3.2.2 Wired-around Connection
IMPORTANT
This redundancy approach is
not recommended.
The wired-around Ethernet connection is used with the CDM-710G modem and CRS-300 1:10
Redundancy Switch, where both modem data interface slots are needed; e.g., where one slot is
HSSI or G.703 and the other slot is GigE. With the Ethernet slot configured for the wired-around
method, this gives full redundancy capability to both data slots. However, care must be taken to
ensure there are no Ethernet network loops or connection problems – this method should only be
used if both modem data slots are used. In general, the wired-around approach can be used in a
hub-to-remotes configuration with standard traffic.