CSU/DSU
Channel Service Unit/Data Service Unit
 If you have any question concerning your wide area network solution or CSU/DSU, please contact our CSU/DSU SUPPORT TEAM.
A CSU/DSU (Channel Service Unit/Data Service Unit) is a hardware device about the size of an external modem that converts digital data frames from the communications technology used on a local area network (LAN) into frames appropriate to a wide-area network (WAN) and vice versa. For example, if you have a Web business from your own home and have leased a digital line (perhaps a T-1 or fractional T-1 line) to a phone company or a gateway at an Internet service provider, you have a CSU/DSU at your end and the phone company or gateway host has a CSU/DSU at its end.
The Channel Service Unit (CSU) receives and transmits signals from and to the WAN line and provides a barrier for electrical interference from either side of the unit. The CSU can also echo loopback signals from the phone company for testing purposes. The Data Service Unit (DSU) manages line control, and converts input and output between RS-232C, RS-449, or V.35 frames from the LAN and the time-division multiplexed (TDM) DSX frames on the T-1 line. The DSU manages timing errors and signal regeneration. The DSU provides a modem-like interface between the computer as Data Terminal Equipment (DTE) and the CSU.
We hope that this page will be your guide to:
- What is CSU/DSU?
- CSU/DSU Tutorials
- CSU/DSU Help
- CSU/DSU information
- CSU/DSU Solutions
CSU/DSUs & Dial Backup DSUs from ADTRAN.
Short for Channel Service Unit/Data Service Unit. The CSU is a device that performs protective and diagnostic functions for a telecommunications line. The DSU is a device that connects a terminal to a digital line. Typically, the two devices are packaged as a single unit. You can think of it as a very high-powered and expensive modem. Such a device is required for both ends of a T-1 or T-3 connection.
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