[JPX]
In order to reduce the risks of AP failure, redundant configuration connecting to either AP2, AP3, or AP4 is recommended.
Multicast transmission is not redundant (not rerouted during system failure) as a network. Redundant configuration of receiving from both multicasts 1 and 2 (multiple single configuration via 2 lines) is recommended to secure reliability.
In case having only one line of single configuration, applicants need to understand the risks of choosing non-redundant configuration and write words saying "We shall take responsibility for any risks of not having redundant configuration by self-determination" as the special note on the application form of arrownet SP connection.

[JASDEC]
Redundant configuration connecting to two locations in AP2, AP3, or AP4 is required.
Having single configuration to AP2 can be selected only for the line connecting from users' backup site.

[TFX]
Redundant configuration connecting to two locations in AP2, AP3, or AP4 is recommended.
Redundant configuration of receiving from both multicasts 1 and 2 (multiple single configuration via 2 lines) is recommended to secure reliability.