COMMUNICATION NETWORK A communication network is a written detailed plan accompanied with a wire and radio plan detailing where each type of communication equipment transmits to (figs. 1-9 and 1-10).

To produce a communication network, you must know what frequency nets will be required for the mission. Higher authority will issue a Communication Electronic Operating Instruction (CEOI) to assist you with determining the frequency nets required.

CEOI contains the technical guidance required to establish and maintain communications in support of operations. The CEOI provides the details required to coordinate and control the various communications means and functions within a unit. This document normally contains call signs, call words, and frequencies to be used by designated operating units. By providing a standardized source of information, the CEOI enhances both operational communications capabilities and communications security. In case of loss or compromise, the standardized format simplifies rapid identification, destruction, and replacement. The following information and instructions are normally included in the CEOI:

General communications instructions Call sign assignments Frequency assignments Radio net circuit designator Wire/ cable trunk circuit designations Wire/ cable tagging codes Telephone directory names and numbers Teletype and data muting indicators Identification and marking panel codes Signal panel message instructions Pyrotechnic and smoke codes Ground-air signals Sound warning signals

Figure 1-9.- COC wire plan. General cryptographic instructions . Effective authentication tables Cryptographic devices to be used Each CEOI is classified according to content. General classification of the CEOI is based on the Current effective editions of the cryptographic highest classified instruction it contains. Some of the key lists frequency nets that may be listed in the CEOI and may

Codes and ciphers be required in the COC areas follows:

Passwords/ challenge 1. Battalion Command Net: Establishes communication to the companies for administrative and General authentication instructions logistics issues.

Figure 1-10.- COC radio plan. 2. Battalion Tactical Net: Establishes 4. Regimental Tactical Net: Establishes communication to the companies for tactical communication from the battalion's COC to the purposes and various reports, such as SPOT, regiment when the battalion is OPCON to the regiment. SALUTE, AMMUNITION, CAUSALITY, and Used for tactical purposes and various reports, such as SPOT, SALUTE, AMMUNITION, CAUSALTY, and SITREPS. SITREPs.

3. Regimental Command Net: Establishes 5. Base Facility Command Net: Establishes communication from the battalion's COC to the communication from the battalion's COC to the base regiment when the battalion is OPCON to the regiment. facility commander. Used for administrative and Used for administrative and logistics issues. logistics issues.

6. Base Facility Tactical Net: Establishes communication from the battalion's COC to the base facility commander. Used for tactical purposes and various reports, such as SPOT, SALUTE, AMMUMTION, CAUSALITY, and SITREPS.

7. Conduct of Fire Net: Establishes communica-tion from the battalion's COC to the battalion's Fire Direction Center (FDC). Used by the companies to call in fire missions and by the fire support coordinator to call in fire support.

8. Rear Area Operating Command Net: Establishes communication, usually by a high-frequency radio (HF), from the battalion's COC to higher authority (i. e., RASC) located outside the base facility, such as RAOC.

9. Communication Coordination Net: Used solely for communication problems within the battalion.

10. Alert/ Broadcast Net (HF): Used to pass alert warning traffic or general traffic about all (or the majority) of the units within the area of operations.