Comtech EF Data CDM-570/570L Vipersat - Manual (Page 141)

Appendix B - Automatic Switching B-23
ToS Switching
Mesh Setup Based on ToS Detection
The detection of a ToS stamped packet by a remote modem can provide the
means for setting up a Single Hop On Demand (SHOD) mesh connection from
that remote to another remote within the network. For these SHOD connections,
it is assumed that each remote site that is part of the SHOD connection has, at
minimum, one additional demodulator configured as a Remote Expansion.
When a remote modem detects a packet that has been stamped with a ToS value
that matches the user defined value, the modem will look at the destination IP
address within the packet. The remote modem will then send a switch request to
the VMS requesting the user defined bandwidth. The switch request also
contains the address that the ToS stamped packet was destined for. The VMS
processes the switch request and compares the destination address to the list of
known subnets to determine if the destination belongs to another remote within
the network. If the address does belong to another remote, the VMS will look
for available hardware and bandwidth and then issue tuning commands to set up
the connection. Each direction of the mesh is set up independently; i.e., the
detection that occurs at remote 1 will establish a connection from remote 1 to
the other remote involved. However, the other remote must perform detection
for set up in the opposite direction.