Special Features:

Each of two identical circuits provides switch selectable choice of 60 interruptions per min (ipm) lampflash, 120 ipm lamp (hold) wink, or a 300 msfc to 30 sec timed delay; delay circuit may be used for automatic ringing timeout; a third, independent circuit provides 2 sec on/4 sec off ringing interruption when used w/optional 9903 ringing interrupter subassy

Properties:

Two or more different types of items having a common mounting or mounted on each other which together form a portion of a telephone terminal but which in itself is not a complete functioning item and cannot be assigned a more definite item name.