| 摘要 |
A network termination card is provided which allows new services to be implemented on the DSLAM on which the network termination card is located without restricting the number of slots used for line termination cards. Software controlled multiplexers are provided on some ports of the switch on the network termination card, and a daughter card connector is provided on the network termination card. When a new service is to be implemented, a specialized daughter card implementing the service can be connected to the daughter card connector. The multiplexers can then be configured to allow the necessary number of ports from the switch to communicate with the daughter card connector, while other multiplexers can be configured to retain communication between the switch and normal components of the DLSAM. The invention allows flexibility in which and how many ports of the switch are used to communicate with the daughter card, thereby allowing a new service to be implemented via the DLSAM without limiting communication between the switch and other regular components beyond what is necessary.
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