Reverse-powered transmission device

摘要

A transmission device includes a first connecting module for connecting a DC/DC power converter to a telephone wire line or to a CPE wire line, and a second connecting module between the telephone and CPE wire lines, a detection module configured to detect a power feeding request signal on the CPE wire line, and a switching module configured to controls the second connecting module in its open state, and send a power ready signal on the CPE wire line, and a not control the second connecting module and not send a signal on the CPE wire line in a standby-by state, so that a total power consumption of the detection and switching modules is lower than a threshold in a stand-by state and higher in the active state, and the detection module is configured to control the switching module in response to a detection of the power feeding request signal.

主权项

1. A transmission device, comprising:
a customer premise equipment (CPE) wire line connected to a CPE; a telephone wire line connected to a plain old telephone service (POTS) telephone exchange through a POTS line, the POTS telephone exchange configured to detect an off-hook state of the transmission device when a current on the POTS line being greater than an off-hook threshold; a DC/DC power converter; a first connecting module configured to connect the DC/DC power converter to at least one of the telephone wire line and the CPE wire line; a second connecting module between the telephone wire line and the CPE wire line, the second connecting module configured to,
block a DC component when the second connecting module is in an open state, andnot block the DC component when the second connecting module being in a closed state; a detection module configured to,
receive power from the DC/DC power converter, anddetect a power feeding request signal on the CPE wire line; and a switching module configured to,
receive power from the DC/DC converter,control the second connecting module in the open state when the switching module is in an active state, andsend a power ready signal on the CPE wire line to the CPE when the switching module is in the active state,not control the second connecting module in the open state when the switching module is in a stand-by state, andnot send the power ready signal on the CPE wire line to the CPE when the switching module is in the stand-by state, wherein
the detection module and the switching module in the stand-by state have a first total power consumption, the first total power consumption is lower than a threshold, the first total power consumption corresponds to the current on the POTS line that is lower than the off-hook threshold,the detection module and the switching module in the active state have a second total power consumption, the second total power consumption is higher than the threshold, the second total power consumption corresponds to the current on the POTS line that is higher than the off-hook threshold, andthe detection module is configured to control the switching module from the stand-by state to the active state based on the detection of the power feeding request signal.