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Power Supply Requirements
SEHI User’s Guide 3-7
JAM Output Specifications
Collisions are propagated through the network using the JAM signal of an
alternating pattern of 1’s and 0’s in accordance with 802.3 specifications
for a repeater unit.
Fragment Extension Specifications
Fragments are extended to a minimum of 96 bits using the JAM [1,0].
Fault Protection Specifications
Each segment disconnects itself from the other segments if 32 consecutive
collisions occur, or if the collision detector of a segment is on for longer
than approximately 110 µs. This fault protection resets automatically after
one packet is transmitted/received onto the fault protected segment
without causing a collision.
3.6 POWER SUPPLY REQUIREMENTS
The SEHI has a universal power supply. The input power requirements
are listed in Table 3-2.
The power supply has two outputs of +5 Vdc and +12 Vdc. The maximum
output power is 40 W and the minimum efficiency is 65% under all
conditions of the line at full load. The minimum and maximum load
currents from each output are listed in Table 3-3.
Table 3-2 Power Requirements
Model Voltage Range Frequency Range
SEHI-22FL
100–125 Vac
or 200–250 Vac
50/60 Hz
Table 3-3 Power Supply Output Specifications
Output Min. Load Max. Load Max Power
+5 Vdc 0.75 A 4 A 20 W
+12 Vdc 0.00 A 2 A 24 W
SEHI Book Page 7 Friday, April 19, 1996 10:46 AM