c. Division Command and Control System.
(1) Common user trunking. Because of an increase in the volume of traffic and a limited
number of channels available, a maximum number of common user circuits should be established. This
increases the efficiency of the system (less idle time per channel).
(2) Switchboards. Whether a unit uses an automatic or manual switchboard, one thing
remains constant: the need for an accurate telephone directory. The directory should be updated
regularly to reflect any changes in subscriber needs. In addition, an up-to-date telephone traffic diagram
should be posted at each switchboard. This diagram is essential for operators to respond to circuit
(3) Line-of-sight (LOS) multichannel systems. Multichannel is the backbone of the division
communications systems. If a unit's multichannel system is down, it is left with single-channel radio
systems which have a shorter range and are more subject to interference.
(4) Messenger. Messenger service is an effective and reliable means of communication;
however, if not monitored closely, it can become an inefficient operation. It is best used for long
messages (routine bulky administrative and logistics) that can be hand delivered rather than transmitted
by radio. An established route and schedule should be made available to all users, and unnecessary and
redundant messenger service should be eliminated.
(5) Facsimile. Today's high speed facsimile (FAX) devices are more user-friendly and
provide higher quality copy than the older models. FAX takes some of the burden off communication
centers and eliminates the time required to process a message.
(6) Wire and cable. At the CP, there is a shared responsibility between signal personnel and
the users. Signal wiremen provide the J-1077 distribution box and users connect their phones to it.
Users lay wire and inspect it for damage. Users must also perform their own operator maintenance on
telephones, ensuring batteries are good.
(7) Radioteletype (RATT). RATT can provide hard copy messages between widely
dispersed units. The AM high frequency (HF) radios and antennas it uses provide extended range. If
the ionospheric conditions are favorable, particularly at night, transmission ranges can extend for
hundreds of miles. The complexity of RATT systems requires more maintenance than simpler radios;
however, RATT can be reliable when used often by well trained teams.
d. Host Nation Communications. Host nation telephone networks are a viable alternative to
tactical systems. In garrison, many units use host nation phones connected to voice-secure equipment
taken from vehicles. Using the civilian systems in a secure mode can provide flexibility, both in
garrison and in the field.