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