Explanation:

DSL, or Digital Subscriber Line, is a technology that provides high-speed internet access over traditional copper telephone lines. It uses a modulation technique to transmit digital data over the existing infrastructure, allowing for faster speeds than traditional dial-up connections.

DSLAM:
- DSLAM stands for Digital Subscriber Line Access Multiplexer.
- It is a device that aggregates multiple DSL connections from customers and connects them to a high-speed backbone network.
- DSLAMs are typically located in the telephone exchange or central office.
- They receive data from multiple DSL modems and route it to the appropriate destination.

CO:
- CO stands for Central Office.
- It is a telecommunications facility that houses the equipment for terminating and switching telephone lines.
- The CO is the point where the telephone network connects to the customer's premises.
- It is responsible for providing local loop services, including DSL connections.

Splitter:
- A splitter, also known as a DSL filter, is a device used to separate voice and data signals on a DSL line.
- It allows for simultaneous use of telephone and DSL services on the same line.
- The splitter filters out the high-frequency DSL signals, ensuring that voice calls are not affected by the data transmission.

CMTS:
- CMTS stands for Cable Modem Termination System.
- It is a device used in cable internet systems to manage and control the flow of data between the cable provider's network and the customer's cable modem.
- CMTS is not directly associated with DSL technology. It is specific to cable internet services.

Conclusion:
In summary, all of the options listed (DSLAM, CO, and Splitter) are associated with DSL technology, except for CMTS. CMTS is related to cable internet systems, not DSL.