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