Figure 1-3.—Example of a telefax address label.

exchanging information. When two terminals communicate in the secure mode, each terminal automatically displays the authentication (identification) information of the distant terminal, and a list of compromised CIKs. This information is scrolled through the display window during secure call setup. The first line of the identification information and the classification level are displayed for the duration of the secure call. The information displayed indicates the approved classification level for the call, but does not authenticate the person using the terminal. The terminal users are responsible for viewing this information to identify the distant party and the maximum security classification level authorized for the call. Secure data transmissions using STU-IIIs may be made by connecting a computer modem phone plug into the MODEM plug receptacle on the backside of the unit, and then activating the "SECURE DATA" mode. The STU-III terminals and keys are Communications Security (COMSEC) material and require special handling. The terminals and keys are administered through the STU-III COMSEC Account (SCA) Custodian. Both the terminals and keys that are issued to users must be signed for. Since the seed key is classified, it must be afforded protection in accordance with Secure Telephone Unit Third Generation STU-III COMSEC Material Management Manual, CMS 6. Although unkeyed STU-III terminals may be carried on mobile operations or exercises, the seed key is never transported, and the CIK key must be transported separately from the STU-III unit. Because CIKs permit the STU-III terminals to be used in the secure mode, the CIKs must be protected against unauthorized access and use. CIKs may be retained by the users who sign for them on local custody. Users must take precautions to prevent unauthorized access and must remember to remove the CIKs from the associated terminals. When the terminal is unkeyed, it must be provided the same protection as any high-value government item, such as a personal computer. When the terminal is keyed, the terminal assumes the highest classification of the key stored within it and must be protected in accordance with the classification of that key. TELEFAX.—Nearly every command uses automatic telephone facsimile (telefax or fax) send and receive terminals to transfer graphic and written environmental information. This equipment may be used to transfer unclassified information only. Figure 1-3 shows an example of a pregummed 1.5-inch by 4-inch label containing certain information that should be included on every telefax. Some commands use a pre-printed cover-page containing this information. # OF PAGES: FROM TO: COMMAND: COMMAND: OFFICE CODE: OFFICE CODE: PHONE #: FAX #: FAX #: Figure 1-3.—Example of a telefax address label. Operation of telefax equipment is usually very simple. You place the original information on the feed tray, dial the destination fax number on the key pad or on the attached telephone instrument, and press the "send" key when a high pitched tone is heard in the receiver. Detailed instructions are normally attached to each terminal. The receive mode is fully automatic. TELEPHONE MODEMS.—Telephone modems are electronic equipment that allow computers to transmit data directly over telephone circuits. Modems are also used to connect desktop computers to Local Area Networks (LANs) or to Wide Area Networks (WANs). There are many different modems in use throughout the Naval Meteorology and Oceanography Command. Most desktop computers now contain a built-m modem. Modems are controlled via the computer with a special type of software program called a communications protocol program. These programs allow the operator to specify the telephone number to be accessed and to specify various communications parameters for the transmitted signal. It is beyond the scope of this training module to discuss the operating procedures for the various protocol programs or communications parameters. Operating instructions for each program are included with the program manual issued with the software. Specific protocol parameters allow the user to access programs such as NODDS. The Naval Meteorology and Oceanography Command Telephone and Address Listing contains addresses, telephone numbers, and telefax numbers for all Naval Meteorology and Oceanography Command activities, Marine Corps weather activities, and offices of other military activities associated with meteorology and oceanography (METOC) support. Your Leading Chief usually maintains the directory and may provide copies at key telephone locations throughout your activity. 1-6