| 摘要 |
<p>An access line termination device is provided which enables down transmission capacity to be expanded in a normal state without changing/modifying a transmission path interface. An up signal of an access line accommodated in a remote device is applied to an interface unit through a line termination unit and multiplexed. Furthermore, the up signal multiplexed at the interface unit is applied to an optical expansion unit, multiplexed with a clockwise down signal from a parent device and sent as a signal directed to an adjacent remote device. At the adjacent remote device, an up signal of its own device and the signal from the remote device 6 at a preceding stage are multiplexed and sent out to a remote device at a subsequent stage.
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