| 摘要 |
<p>Embodiments of the present invention disclose a digital subscriber line circuit, including: a line driver, an EC module, a transformer module, a first high-pass filter, an impedance, and a bypassable high-pass filter. The transformer module is a high-pass filter, a receiving channel of the high-pass filter can receive an uplink signal of AnnexA and part of ISDN signals, and a sending channel of the high-pass filter can send a downlink signal of AnnexA. The first high-pass filter can send a downlink signal of AnnexA. The bypassable high-pass filter filters out an ISDN signal when being used in cooperation with an ISDN, and is bypassable and receives an uplink signal of AnnexA when being used in cooperation with a POTS. The embodiments of the present invention also disclose a digital subscriber line device. By using the embodiments of the present invention, both an AnnexA mode and an AnnexB mode are supported, and an original POTS service and ISDN service on a copper line are compatible.</p> |
