Which device is primarily responsible for signal timing in a communication network?

The Data Service Unit (DSU) plays a crucial role in managing signal timing within a communication network, particularly in relation to digital signaling. The DSU is typically used in conjunction with a modem, functioning to ensure that the digital data generated by end-user devices is accurately transmitted across the network.

One of the key responsibilities of the DSU is to interface digital data from devices like routers and switches with the analog signals used in transmission lines. To accomplish this, the DSU adjusts the timing of the signals to match the requirements of the transmission medium, preventing issues such as data loss or corruption. By synchronizing the signals, the DSU ensures that data packets are sent and received without timing mismatches that could lead to errors.

Other devices mentioned in the options serve different functions. Data Terminal Equipment (DTE) refers to end-user devices like computers that generate and receive data but don't primarily manage signal timing. A Cyclic Redundancy Checker is used for error-checking in data transmissions but does not impact the timing of signals. End systems, while involved in data creation and transmission, lack the specialized functionality of a DSU in terms of signal management.

Thus, the role of the DSU in handling and coordinating the timing of signals makes