Hot Plugging / Unplugging; Bus Status Indication (Led) - Yamaha mLAN Manual Book

Technical Explanations

7. Hot Plugging / Unplugging

IEEE 1394 allows cables to be freely plugged and unplugged even if the power is turned on. Since
IDs are assigned automatically when the topology is modified, the user does not need to reset the
IDs. The system can be used immediately after it has been connected.
mLAN feature
One feature of mLAN is that after nodes are connected, the MIDI and audio signal flow can be routed
freely without having to actually change physical connections. No particular care need be taken regarding
the order of connections.

8. Bus Status Indication (LED)

mLAN products have a two-color LED (green and red) by their connector port, a three-color
(green, red and orange) LED labeled RT/ERR and a blue LED labeled ACTIVE, nearby this.
The ACTIVE LED indicates that this node is functioning as a relay. If a node is not Powered-on but
its ACTIVE indicator is lit, it is receiving power from another node.
RT/ERR can be either green or red:
[Green] ...... Indicates that this is the root node.
[Red]/[Orange]...... Indicates that an error has occurred. The type of error is indicated by the way
If the above-mentioned RT/ERR does not indicate an error (i.e., dark or lit green), the connector
LED has the following meaning:
[Green] ...... The node connected to this connector is a leaf node. Even if this connector is
unplugged, a major change (such as splitting the bus (system) into two) will not
occur.
[Red] .......... The node connected to this connector is not a leaf node. If this connector is
unplugged, the bus (system) will be split into two parts. As a result, a Long Bus Reset
may occur and the sound may be interrupted.
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in which the connector LED is lit. For details, refer to the table in the Owner's
Manual for the respective device.