Description: The decAtmSlotLedProgram string is a sequence of instructions
 for the LED state.  The LED constantly repeats the
 program.  Each LED state is represented by a two octet
 sequence where the value of the first octet of the pair
 indicates the color of the LED, and the value of the
 second octet of the pair indicates the duration in which
 that color will be present.

 +----------+----------+  --/ /--  +----------+----------+
 |   Color  | Duration |           |   Color  | Duration |
 +----------+----------+  --/ /--  +----------+----------+
    
 The 'color' octet may have one of the following values:

    0 - off
    1 - other
    2 - red
    3 - yellow
    4 - green
    5 - blue
    6 - red-blinking
    7 - yellow-blinking
    8 - blue-blinking
    9 - green-blinking
    
 The value 'off' indicates that the LED is off.
    
 The value 'other' indicates a color not covered by any
 others in the list.

 The value of the second octet in each pair indicates the
 duration in which that color will be present.  A value
 of zero indicates that the LED is off.  A value of 0xff
 indicates that the LED is always on.  Values in between
 0 and 0xff indicate the duration in 10 ms ticks.

 A zero length string may be returned if the LED is 'not
 present'.  This indicates that the LED is currently not
 visible.
    
 Activity LEDs are a special case.  Activity LEDs are
 defined as LEDs which blink whenever data is received on
 the line.  They are typically on solid under heavy
 activity.  Since these LEDs can change rapidly, the
 following rules apply:
    
   o  The initial state of activity LEDs is off.
   o  If the line shows activity any time in a 10 second
      period, then the LED is shown as on.
   o  If the line shown inactivity any time in a 10 second
      period, then the LED is shown as off.

See the 'pcomLedProgram' object in the DECHUB900-COMMON MIB
for examples.