| 单词 | ones density |
| 释义 | ones density The density of one (1) bits in a digital bit stream. Depending on specific nature of the T- carrier network, 15–80 zero (0) bits can be transmitted in a row as long as the density of ones is at least 12.5 percent (1 in 8) over a specified interval of time. Ones density ensures that there are electrical pulses on a circuit with at least a minimal density in order to keep the various circuit terminating equipment and repeaters synchronized. Ones density is maintained by a channel service unit (CSU), a type of data communications equipment (DCE) that provides the customer interface to a digital circuit. In the event that the circuit is silent, i.e., there is no active data transmission, the CSU will regularly transmit one (1) bits, known as keep alive bits, for the same purpose. See also CSU, DCE, pulse, repeater, synchronize, and T-carrier. |
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