TM 11-7025-234-23
in a single or double rack mount (fig. 1-4).
Mounting Options
1-17. POWER OPTIONS
Ac power is supplied to the modem through a seven foot line cord with a grounded
three prong plug. If chassis protective ground is connected through the third
prong of the power plug, a separate ground wire is not required. A mother board
strap permits connection of signal ground to protective ground (fig. 1-7). A two
position switch on the power supply allows selection of either 115 or 230 V ac --
+10%
single phase 47 to 63 Hz at 20 watts maximum power.
Modem board configuration is changed by jumpers (fig. 1-5). Jumpers are located on
the mother board, EIA Interface (A3), Control (A4), Remote Loopback (A8), Input/
output (A9), and rate/mode display boards. Three types of jumpers are used:
Dip switch jumpers - miniature rocker switches used to select applicable
configurations. They are located on the top of circuit boards and
accessible from the top of modem
1-9
