Connection equipment

The system uses modems, Integrated Services Digital Network (ISDN) terminal adapters, token-ring adapters, Ethernet adapters, or channel service unit/data service unit (CSU/DSU) devices to handle Point-to-Point Protocol (PPP) connections.

These are four kinds of communication equipment that you can use with your PPP environment:

• Modems

• CSU/DSU

• ISDN terminal adapters

• Ethernet adapters (for PPPoE connections)

• Modems
  Both external and internal modems can be used for Point-to-Point Protocol (PPP) connections.

• CSU/DSU
  A channel service unit (CSU) is a device that connects a terminal to a digital line. A data service unit (DSU) is a device that performs protective and diagnostic functions for a telecommunications line. Typically, the two devices are packaged as a single unit, CSU/DSU.

• ISDN terminal adapters
  Integrated Services Digital Network (ISDN) provides you with a digital connection that allows you to communicate by using any combination of voice, data, and video, among other multimedia applications.

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