Patent ID: 8559816

Claim:
An extender box (EB), comprising: a downlink data sending module configured to send downlink data to first passive optical network (PON) devices; at least two uplink data receiving modules configured to receive uplink data sent from a corresponding first PON device respectively; a duplexer configured to convert a data transmission mode used by the downlink data sending module and the uplink data receiving modules from dual-fiber transmission to single-fiber transmission to implement single-fiber bidirectional transceiving; and an embedded optical network unit configured to measure power and a bit error rate of the uplink data and report a measurement result to a second PON device; wherein: the uplink data receiving modules have ports that are connected with uplink ports of the first PON devices and correspond to the uplink ports on a one-to-one basis; and optical fibers of the uplink data receiving modules that are connected with the uplink ports of the first PON devices are separated from optical fiber of the downlink data sending module, wherein the optical fiber is connected with downlink ports of the first PON devices. wherein the first PON devices are optical network units (ONUs), the second PON device is an optical line terminal (OLT), the embedded optical network unit is an optical network terminal (ONT); and each uplink data receiving module comprises: a receiving submodule configured to receive uplink data sent from a corresponding ONU, an optical detecting module configured to detect the uplink data sent from the corresponding ONU and acquire a detection result, and when the detection result indicates that the uplink data is abnormal, report to the OLT through the embedded ONT that the corresponding ONU is abnormal so that the OLT commands the corresponding ONU to stop sending uplink optical signals, and a processing module configured to disconnect an uplink channel corresponding to the uplink data sent by the corresponding ONU, when the detection result from the optical detecting module indicates that the uplink data is abnormal.