| 摘要 |
<p>SIGNALING STORAGE IN DIGITAL CHANNEL BANKS In a digital channel bank, the binary signaling states (on-hook, off-hook) are updated periodically for each channel. Some number (n ? 2) of the most recent of these samples are stored at the receive end of the digital system for each message channel. Under normal working conditions the output (to the switching machine) is directly influenced by the incoming real-time samples. However, when a carrier disturbance (i.e., out-of-frame condition) is detected, the updating process is stopped and the output is controlled by the older stored bits. That is, instead of sending the real-time signaling information of each channel to the switch, the signaling bits that were received and stored during a previous frame (e.g., 12 or more frames earlier) are now coupled to the switch. This assures a high probability that the proper signaling state is presented to the switch during short carrier disturbances.</p> |
