| 单词 | CSU (Channel Service Unit) |
| 释义 | CSU (Channel Service Unit) Data circuit terminating equipment, i.e., data communications equip- ment (DCE), that provides the customer interface to a digital circuit. A CSU performs a number of functions, including isolation of the data terminal equipment (DTE) from the circuit for purposes of network testing, and electrical isolation from the circuit for protection from aberrant voltages. Many contemporary CSUs also have the ability to perform various line analyses, including monitoring the signal level.The CSU also serves to resolve issues of electrical coding between DTE and the circuit, and to ensure that ones density is achieved. Depending on the carrier network, 15–80 zeros 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. Also, a CSU inserts, or stuffs, 1 bits on a periodic basis in order to ensure that the various network elements maintain synchronization. A CSU also serves to provide signal regeneration and generates keep-alive signals to maintain the circuit in the event of a DTE transmission failure. Finally, the CSU stores various performance data in temporary memory for analysis by an upstream element management system (EMS). A CSU and data service unit (DSU) commonly are combined in a CSU/DSU, also known as a CDSU. See also DCE, DSU, EMS, ones density, and stuff bit. |
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