| 摘要 |
A gateway, for connecting an existing public switched telephone network (PSTN) and an Internet Protocol (IP) network, separating hardware into an interface unit with the PSTN, a processing unit having a conversion function between a PCM signal and IP packets, an IP interface unit, and a control unit for controlling the overall apparatus. By switching these hardware blocks to match with the type of the network and the type of the media, it becomes possible to achieve compatibility with various types of PSTNs and IP networks and various services such as VoIP and NAS/RAS. Also, a function block for enabling access to the duplex control units from a maintenance system or the like by a single MAC address and autonomously restoring the system from failure due to a software logic conflict and a function block for preventing file destruction are provided.
|
