| 摘要 |
A system and method for providing analog telephone service, including E-911, service can be provided at a site that uses VoIP over SDSL and has no POTS lines, in the event of a power outage at the site. The system comprises a remote cross connect switch connected to an integrated access device, to a digital access multiplexer connected to a digital telecommunications network, and to a voice service gateway, the remote cross connect switch operable to supply a first connection between the integrated access device and the digital access multiplexer, a second connection between the integrated access device and the voice service gateway, and to switch between the first and second connections, the remote cross connect switch implemented between a central office and a user location; and a network management system operable to receive a message from the integrated access device indicating that power supplied to the integrated access device has failed and to, in response, transmit a command to the remote cross connect switch to switch from the first connection to the second connection thus providing analog voice service, and upon power being restored to the integrated access device, send a command to the remote cross connect switch which is operable to re-establish the original connection between the integrated access device and the digital access multiplexer, thus restoring VoIP over SDSL.
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