在通信鏈路上出現的噪音或無用的信號，它損害語音、數據的接收或正確的解釋。
On a communications link, noise or unwanted signals that impair the receipt or correct interpretation of speech or data.
在網路中，指由數據鏈路連接的或共享公共控制的設備、程序或區域。
In a network, pertaining to devices, programs, or domains that are connected by a data link or that share common control.
一種傳送控制字元，用於指明一個或多個後繼的位模式不能正確地解釋為系統編碼或系統鏈路協議中的字元。
A transmission control character used to indicate that one or more of the following bit patterns have no correct interpretations as characters in the code or link protocol of the system.
