| 摘要 |
An asynchronous transfer mode (ATM) based very-high-bit-rate digital subscriber line (VDSL) communication system for providing alarm services between an alarm service provider and a subscriber includes an ATM network connected to an alarm service provider. A host digital terminal is connected to the ATM network by an ATM permanent virtual circuit. The host digital terminal and the alarm service provider communicate alarm signals on the ATM permanent virtual circuit through the ATM network. A customer provided equipment (CPE) data device is connected through the optical network unit to the host digital terminal by a well known VDSL permanent virtual circuit. The well known VDSL permanent virtual circuit is supported on a fiber optics link between the host digital terminal and the optical network unit and a twisted pair link between the optical network unit and the CPE data device. The CPE data device and the host digital terminal communicate alarm signals on the well known VDSL permanent virtual circuit. A subscriber terminal unit is connected to the CPE data device for communicating alarm signals with the CPE data device. The host digital terminal connects the ATM permanent virtual circuit and the well known VDSL permanent virtual circuit to communicate the alarm signals between the alarm service provider and the subscriber terminal unit. |
