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FinM Deployment Guide
Release 4.2.46
2‐13
Intra Train Handover (ITHO) Update Message
Network Guidelines
This process happens in parallel and independently from the IBHO. The background process
consists of a continuous evaluation between the 2 on‐board TMUs, as to which can receive
the higher throughput (regardless of which base they are connected to).
consists of a continuous evaluation between the 2 on‐board TMUs, as to which can receive
the higher throughput (regardless of which base they are connected to).
When an ITHO occurs, an update must also be sent to the on‐board router. This update will
refresh the switches along the new data path as to the new active TMU.
refresh the switches along the new data path as to the new active TMU.
where it is shown that TMU‐A is connected to TBS‐1 and is ACTIVE
(passing traffic). All traffic flows in the green path.
TMU‐B is PASSIVE. It has an idle connection to a TBS and it monitors the potential throughput,
but does not pass traffic.
but does not pass traffic.
Figure 2‐9: ITHO ‐ Part 1
For Regualtor Approval Only