List down common devices used in the intercom system​

Intercom Base Station

The base station is the central component to an intercom system and is the point from which the entire system is controlled. All other parts of the intercom – such as desk stations or wall mounts – are connected to the main base station. Because it is connected to all intercom stations, the main base station possesses the ability to broadcast messages to all stations at once and therefore may act as a public address system. The main base station has the capability to initiate intercom communication with any station connected to the system and also has the capability to mute any station. Base stations are also referred to as “master stations”.

Intercom Substation

Substations are what would commonly be known as intercom speakers. Substations broadcast one-way communication from the base station and do not have buttons or microphones – they are not capable of initiating correspondence, they are merely speakers in an intercom system. Substations are commonly used in factories, airports, schools, train stations, film sets, and malls. There are smaller uses for substations as well, such as in the case of some baby monitors where a base station monitor is placed in a room with a baby and a substation monitor is taken along with the parent. The parent can hear the baby, but the baby cannot hear the parent.

Intercom Stations

Intercom stations are the parts of an intercom that connect to the bas station, such as desk modules, headsets, handsets, and wall mounted intercom stations. Intercom stations possess a talk button and microphone and may initiate communication with the base station. Intercom stations are actually referred to as substations with additional functionality, thus being the ability to engage in two-way communication.

An intercom station generally has several parts that it is comprised of. Most importantly, it will have a panel with switches including a “talk” button. Using the talk button turns on the microphone function within the speaker, allowing the individual using the intercom to relay his or her vocal message. Often, the “talk” button must be pressed the entire time that the individual is speaking. When the “talk” button is activated, the speaker is being utilized as a microphone and therefore the intercom station can receive no sound. Further, each intercom station possess a power source and wiring which connects it to the base station.

Explanation:

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1. read the following excerpt from franklin d. roosevelt's "fireside chat 19":

on the other side of the picture, we must learn also to know that guerilla warfare against the germans in, let us say serbia or norway, us; that a successful russian offensive against the germans us; and that british successes on land or sea in any part of the world strengthen our hands.

remember always that germany and italy, regardless of any formal declaration of war, consider themselves at war with the united states at this moment just as much as they consider themselves at war with britain or russia. and germany puts all the other republics of the americas into the same category of enemies. the people of our sister republics of this hemisphere can be honored by that fact.  

the true goal we seek is far above and beyond the ugly field of battle. when we resort to force, as now we must, we are determined that this force shall be directed toward ultimate good as well as against immediate evil. we americans are not destroyers — we are builders.

analyze the effectiveness of this excerpt. how does it function within the speech as a whole? how does the structure of the excerpt to convey the speech's purpose and key points? support your argument with evidence from the speech. (10 points)

no