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Transmission

Transmission: How a Fax Actually Sends

Transmission

The process of a fax moving from sender to recipient, covering automatic, batch, delayed, and real-time transmission modes.

Published on
September 9, 2026
Last updated on
September 24, 2026

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  • Transmission is the process of a fax moving from a sending device to a recipient, covering everything from dialing to the final page transferring.
  • Automatic transmission sends a fax without the sender manually redialing or monitoring the call.
  • Batch transmission groups several faxes to the same destination into one call; delayed transmission schedules a fax for a later time; real-time transmission sends immediately.
  • Fax.Plus supports scheduling a fax for delayed sending, alongside standard immediate, real-time transmission.

What Is Fax Transmission?

Transmission is the process of a fax moving from a sending device to a recipient: everything from the call connecting to the final page transferring across.

The Four Transmission Modes

  • Automatic Transmission: the fax sends, and if needed, is retried, without the sender having to notice a failure and resend it manually. See resending a failed attempt automatically for how that retry works.
  • Batch Transmission: several faxes queued to the same destination go out together in one call, rather than as separate calls.
  • Delayed Transmission: a fax is scheduled to send at a chosen future time instead of immediately.
  • Real-Time Transmission: the fax sends as soon as it's submitted, with no scheduling delay.

When Transmission Doesn't Go Smoothly

A transmission interrupted by line noise or a dropped call can often still be recovered without starting over: an error-correction mechanism like ECM resends only the corrupted parts, and a separate retry mechanism can resend the whole attempt if the call itself failed to connect.

Transmission on Fax.Plus

Fax.Plus supports both real-time sending and delayed transmission, letting a sender schedule a fax for a chosen date and time instead of sending immediately. Every transmission, whichever mode, is logged in the account's fax storage and job queue, and a completed send produces a confirmation report.

A Common Case: Scheduling Overnight Fax Sends

A mid-size financial services firm in Quebec schedules a batch of client statements to go out by delayed transmission overnight, so the faxes send automatically once business hours and call volume are no longer a factor, instead of someone submitting each one by hand the next morning.

FAQs

What is the difference between real-time and delayed fax transmission?

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Real-time transmission sends a fax immediately after it's submitted. Delayed transmission schedules that same fax to go out at a chosen future time instead, which Fax.Plus supports for timing a send around business hours or lower call volume.

What is the difference between automatic and batch fax transmission?

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Automatic transmission sends a single fax, retrying it if needed, without the sender managing it manually. Batch transmission groups several faxes to the same destination into one call instead of separate calls.

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