text: Chapter 4
  leveling keeps the transmission traffic constant. Coordinate messages transmitted for traffic leveling or false
  peaks to avoid operations security violations, electromagnetic interference, and confusion among friendly
  equipment operators.
  4-355. During operations,dismounted tactical unit area coverage and distance extension is a major concern
  to the commander. Communications inside buildings or over urban terrain is a challenge. For these
  conditions,the multiband inter/intra team radio system provides a “back-to-back”(two radios) retransmission
  (known as RETRANS) capability for communications security and plain text modes. Beside two radios,the
  only hardware required for RETRANS is a small cable kit and someelectronic filters. When configured for
  RETRANS operations, a true digital repeater form. Since the radios repeat the transmitted digits and since
  the radios do not have to have any communications security keys loaded in them,the radios do not degrade
  signal quality.(SeeATP 6-02.72 for additional information.)
  4-356. Automated Communications Engineering Software equipment and subsequent signal operating
  instructions development resolve many problems concerning communications patterns;they allow users to
  change frequencies often, and at random. This is an important aspect of confusing enemy traffic analysts.
  Enemy traffic analysts are confused when frequencies,network call signs,locations,and operators are often
  changed. Communications procedures require flexibility to avoid establishing communications patterns. (See
  ATP 6-02.53 for additional information.)
  Control of Electromagnetic Emissions
  4-357. The control of electromagnetic emissions is essential to successful defense against the enemy’s
  attempts to destroy or disrupt the BCT’s communications. Emission control is the selective and controlled
  use of electromagnetic, acoustic, or other emitters to optimize command and control capabilities while
  minimizing,for operations security. When operating radios,the BCT exercises emission control at all times
  within all echelons and only transmitwhen needed to accomplish the mission. Enemy intelligence analysts
  look for patterns they can turn into usable information. Inactive friendly transmitters do not provide the
  enemy with useable intelligence. Emission control can be total;for example,the commander may direct radio
  silence whenever desired. Radio silenceis the status on a radio network in which all stations are directed to
  continuously monitor without transmitting,except under established criteria (ATP 6-02.53).
  4-358. Radio operators keep transmissions to a minimum (20 seconds absolute maximum, 15 seconds
  maximum preferred) and transmit only mission-critical information. Good emission control makes the use of
  communications equipment appear random and is therefore consistent with good EP practices. This technique
  alone will not eliminate the enemy’s ability to find a friendly transmitter;but when combined with other EP
  techniques,it makes locating a transmitter more difficult.
  Replacement and Concealment
  4-359. Replacement involves establishing alternate routes and means of doing what the commander
  requires. Frequency modulation voice communications are the most critical communications used by the
  commander during enemy engagements and require reserving critical systems for critical operations. The
  enemy should not have access to information about friendly critical systems until the information is useless.
  4-360. The BCT utilizes alternate means of communication before enemy engagements. This ensures the
  enemy cannot establish a database to destroy primary means of communication. If the primary means
  degrades, replace primary systems with alternate means of communication. Replacements require
  preplanning and careful coordination; if not, compromise of the alternate means of communication occurs
  and is no longer useful as the primary means of communication. Users of communications equipment require
  knowledge of how and when to use the primary and alternate means of communication. This planning and
  knowledge ensurethe mostefficient use of communications systems.
  4-361. The BCT commander and subordinate commanders ensure effective employment of all
  communications equipment,despite the enemy’s concerted efforts to degrade friendly communication to the
  enemy’s tactical advantage. Operation plans should include provisions to conceal communications personnel,
  equipment,and transmissions. As it is difficult to conceal most communications systems,installing antennas
  as low as possible on the backside of terrain features and behind manmade obstacles help conceal
  communications equipment while still permitting communication.