The textual name of the service instance. The value of this
column should be the name of the component as assigned by the
local interface/media type and should be be suitable for use
in commands entered at the device's 'console'. This might be
text name, such as 'si1' or a simple service instance number,
such as '1', depending on the interface naming syntax of the
device.
If there is no local name or this object is otherwise not
applicable, then this object contains a zero-length string.