| 摘要 |
<p>An apparatus and method for maintaining service on a digital subscriber line are described. An analog service system (POTS), which provides analog service with a battery back-up (101) capable of delivering power during a power outage and a digital service unit (2) coupled to the analog service system are included. The digital service system provides digital service to a user. A relay (33) is coupled to the analog service system and the digital service unit to enable a service line (53) with analog service or digital service responsive to a power outage event. Service is switched digital to analog during the power outage event.</p> |
