CSU/DSU

A CSU/DSU (channel service unit/data service unit) is a digital-interface device used to connect data terminal equipment (DTE), such as a router, to a digital circuit, such as a Digital Signal 1 (DS1) T1 line. The CSU/DSU implements two different functions. The channel service unit (CSU) is responsible for the connection to the telecommunication network, while the data service unit (DSU) is responsible for managing the interface with the DTE.

A CSU/DSU is the equivalent of the modem for an entire LAN. The DCE, commonly a modem or CSU/DSU, is the device used to convert the user data from the DTE into a form acceptable to the WAN service provider transmission link. [1]

WAN interface

The WAN Interface Card (WIC) may contain an integrated CSU/DSU that can be inserted into a router slot. An example of a WIC is the 1-port 56/64-kbit/s DSU/CSU WIC (WIC-1DSU-56K4) by Cisco Systems. DTE is generally a router, but can also be a terminal, computer, printer, or fax machine if they connect directly to the service provider network.

gollark: PotatOS is MIT-licensed, so it has that, as well as some extra clauses like> If any provision of this policy is found by a court (or other entity) to be unenforceable, it nevertheless remains in force. This organization is not liable and this agreement shall not be construed. We are not responsible for any issue whatsoever at all arising from use of potatOS, potatOS services, anything at all, or otherwise.and> You are responsible for anything which potatOS might do to your things. You ran it. It is all your fault. We are not liable, ethically, morally, existentially, financially or legally, for anything whatsoever.for safety.
gollark: Maybe the ATL license but with a "NO WARRANTY WHATSOEVER" bit.
gollark: I'm now imagining having a bunch of highly-paid corporate lawyers trying to figure out exactly what circumstances they can use some software in based on the day of the week.
gollark: Good idea! It could switch between them.
gollark: Hmm, maybe I could have something where the applicable set of licenses is deterministically chosen based on the current date or something.

References
  1. Microsoft Official Academic Course (2012). 98-366: MTA Networking Fundamentals. Hoboken, NJ: John Wiley & Sons. p. 151. ISBN 978-0-470-90183-0.
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