For a remote batch-processing setup where data is only sent from the remote site to the central computer (input only), which transmission mode is most appropriate?

Introduction / Context:
Transmission modes determine the directionality of data flow between endpoints. In remote batch processing with input-only traffic, understanding simplex versus half-duplex and full-duplex is essential to select a cost-effective and technically suitable link type.

Given Data / Assumptions:

• Workload: remote site sends data to a central computer.
• No return traffic is required other than possible acknowledgments that can be handled out of band or are not required by the problem statement.
• Goal: choose a mode that matches one-way communication.

Concept / Approach:

Simplex communication supports one-way transmission only. Half-duplex alternates directions, and full-duplex supports simultaneous two-way communication. For pure input to the central host, simplex lines align directly with the requirement, often reducing complexity and potentially cost compared to bidirectional modes.

Step-by-Step Solution:

Verification / Alternative check:

Historically, many batch data collection systems used one-way feeds (e.g., telemetry, forms scanning) where simplex links sufficed, validating the choice.

Why Other Options Are Wrong:

Telegraph line: A historical medium, not a transmission mode; it does not specifically denote one-way suitability.

Mixedband channel: Nonstandard term in this context; does not directly address directionality.

All the above: Incorrect because only simplex directly meets the requirement.

None of the above: Incorrect because simplex is appropriate.

Common Pitfalls:

Assuming acknowledgments require reverse data flow. The question constrains the scenario to input only, making simplex the intended match.

Final Answer:

Simplex lines