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Home / Glossary / CSU

Glossary · Device

CSU

Channel Service Unit

In plain language

A device that connects a business's digital telephone or data line to the provider's network.

The metaphor

Like the adapter at the wall where the phone company's pipe meets your own plumbing.

Going deeper

How it works

Used with leased digital lines such as T1.
Often built into the router today.
Handles signals and testing.
Supplied by the provider in many cases.

How WILDCARD handles it

Network covers the equipment behind the provider's line.

In practice

An older office has a box near the router.
A provider replaces it during an upgrade.
A line test runs through it.

A question owners ask

Do I need one?

Only with certain leased lines. Most offices use cable or fibre without it.

Where WILDCARD handles this

Network

Firewall managed and monitored
Switches kept current
On-prem Active Directory auth

Start with Network

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