Final answer:
Classified communications prioritize security and typically do not consider interference with consumer electronics; instead, they focus on secure and reliable transmission of binary digital data.
Step-by-step explanation:
When considering classified transmissions over secure telephone devices, several factors are taken into account to protect the integrity of the communication. However, one thing that is NOT typically considered prior to such transmissions is the potential interference with unrelated consumer-grade electronics, such as the issue of mobile phone frequencies potentially affecting medical equipment as mentioned. Classified communication systems are designed to operate securely and reliably under various conditions without being affected by common electronic devices.
Cell phone conversations, television voice, and video images, as well as computer data, are often transmitted as digital data in the form of binary ones and zeros, facilitating not only clear data transmission when signals are weak but also enabling the compression of this digital data to transmit more information within each frequency range.