CSU/DSU

A Channel Service Unit / Data Service Unit (CSU / DSU ) is a hardware component that has approximately the size of an external modem and a similar function is performed as a modem: Modem prepare data packets so that they are analog for transport over telephone lines are suitable. A CSU / DSU provides contrast for the adaptation of data packets to digital WAN links, such as Frame Relay, PRI or T1.

As an example of the use of a CSU / DSU, you can use a company that operates its own web server and has hired a digital connection (for example, a T1 connection ). The company is connected to a telecommunications service provider or to the gateway of an Internet service provider. With a constellation of this kind, there must be a CSU / DSU both on the side of the company as well as the telephone company or the gateway.

In a CSU / DSU is two devices in one:

Channel Service Unit (CSU )

CSU forms a barrier to electrical interference from both sides of the connection. It ensures that malfunctions of the DSU be prevented and is also responsible for buffering and flow control.

The CSU provides diagnostic facilities, and makes it possible that the combination of the distance by means of loop-back signals being tested.

Data Service Unit ( DSU)

The DSU takes care of time error and signal booster. It converts the input and the output between RS -232C, RS-449, or V.xx frames that come from the LAN and DSX - frames for the time-division multiplex (TDM ) on a T -1 connection are provided.

Variants

CSU and DSU are produced as separate products, but can also be part of a WAN, T1 card. For most devices variants to DSU and CSU are in the same housing. The DSU, however, can also be incorporated in a multiplexer, that is, in a device that is used to combine digital signals of high-speed connections.

A CSU / DSU is often connected to a router.

  • Network device
  • Interface
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