Toshiba V Series, User Manual

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3.5 MAU Power Supply
3
3.5 MAU Power Supply
Since the EN311 supplies 12-V DC power to the 10BASE5 MAU and the 10BASE2 MAU
(the latter of which is build into the EN311), an external 12-V DC power supply must be
connected to the MAU power supply terminal block. This means that 12-V DC power
must be provided to the EN311, regardless of which network type is used. The EXT.
POWER LED will light if the S controller power supply is operating normally and 12-V DC
power is supplied to the EN311.
Also note that the FG terminal in the MAU power supply terminal block must be grounded
to Class D grounding(100W or less ground registance) provided for the sole use of
control equipment. Such grounding is critical for reducing noise in the AUI cable. Figure
3-6 shows the method used to provide this power.
Figure 3-6 Providing 12-VDC Power
(1) DC 12V Power Unit
Since an external power supply is not included with the EN311, installations will have
to provide this equipment separately. Select an external power supply that matches
the environment in which the EN311 is used and the number of EN311 units
supplied. The table below lists a line of recommended power supply units.
[ ] : Output power (in watts)...Select the actual model according to the number of EN311
modules to which power must be supplied.
Model SR [ ] -12
Manufacture Nemic-Lambda
FG (100
Ω
or less ground registance)
DC12V
＋
－