| 摘要 |
<p>A scalable multi-level data bit stream (38) is presented which is capable of supporting variable bandwidth ATM network access, including multiple rates for plural bearer channels of voice communications and increased rates for video and data (file transfer) communications. To support communications system repairability, the bit stream (38) includes an embedded operation channel (42) for connection maintenance, performance monitoring, path tracing and testing. Furthermore, the bit stream (38) includes framing data for performing add/drop multiplexing to control bandwidth use by identifying added and dropped bearer channels communicated within the bit stream. The interface with the ATM network is provided through an ATM adaptation layer that segments the bit stream into ATM cells (26) and also assembles the bit from received ATM cells (26). Both wireless and wireline communications systems are supported with use of the bit stream to access the ATM network (12).</p> |
