LMS-11 OPERATION AND DISPLAYS

facilitate operator selections and entries. The LMS-11 keyboard is shown in figure 3-4. Many of the keys on the LMS-11 keyboard are not used and the software does not recognize these keys. The actual functions of the keys are covered later in this chapter. Accessory Group (AG) The accessory group contains a color graphics printer and spare parts and supplies for the LMS-11. The shipping container is also used to store the DPG and CDG container covers when the printer is removed and mounted on the LMS-11. The color graphics printer is used to provide hard-copy printouts of the display screen on plain paper or clear transparency material. LMS-11 OPERATION AND DISPLAYS The LMS-11 provides real-time monitoring of Link-11 operations. Problems with the net can be easily detected in real time and you can determine the cause of the problems by evaluating the different displays. When the cause is determined, the operator or technician can take corrective action. System Initialization When the LMS-11 is turned on following the correct power-up sequence, the computer runs a group of self-tests and then boots the disk in drive 0. When the booting is complete, the LMS-11 monitor displays the following message: “BOOTING COMPLETE, SWITCH TO RGB.” At this time, the operator should depress the RGB button on the monitor. The Initialization display is the first screen displayed after the software is loaded. The operator can also recall the Initialization display by pressing the INIT button of the keyboard. The Initialization display screen is shown in figure 3-5. PRINTER. Selects which printer, if any, is being used with the LMS-11. NET-MODE. Selects the Link-11 mode: Net Sync, Net Test, Roll Call, Broadcast, or Short Broadcast. The default is Roll Call. DATA RATE. Selects whether the link is operating in the fast or slow data rate. FREQ-CORR. Enables or disables Doppler correction. CALL-TIMEOUT. Allows the operator to specify the number of frames for the missed call timeout. Normal link operations is 15 frames but is increased to 127 frames for satellite link operations. When all the required data is entered, the operator should select the desired mode of operation for the LMS-11. The five on-line modes are as follows: LINK MONITOR, NET, PU, SPECTRUM, and CARRIER SUPPRESSION. Each mode has a unique display screen. All display screens consist of the following three parts: the header, the link signal or information area, and the status display. The header is at the top of the screen and indicates the mode being displayed. The information area is the middle section of the display, and the status display is at the bottom of the screen. The status display is the same for all on-line modes. Link Monitor Mode The link monitor mode display reflects link activity in real time. This display allows the operator or technician to monitor link operations and detect problems as they occur. To select the link monitor mode, the operator presses the function key labeled LM. The link monitor mode display is shown in figure 3-6. During the initialization process, the operator is required to enter the following Link-11 operating parameters: DATE and TIME. 3-9