Cabletron Systems SEH-22 User Manual
CHAPTER 2: INSTALLATION REQUIREMENTS/SPECIFICATIONS
2-6
SEH USER’S GUIDE
Fault Protection:
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
from the other segments if 32
consecutive collisions occur, or if
the collision detector of a segment
is on for longer than approximately
110
µ
s. This fault protection resets
automatically after one packet is
transmitted or received onto the
fault protected segment without
causing a collision.
transmitted or received onto the
fault protected segment without
causing a collision.
Power Requirements
The SEH uses a universal power supply. The input power requirements
are listed below.
are listed below.
The power supply has two outputs of +5 Vdc and +12 Vdc. The maximum
output power is 20 W and the minimum efficiency is 65% under all
conditions of line at full load.
output power is 20 W and the minimum efficiency is 65% under all
conditions of line at full load.
Environmental Requirements
Operating Temperature:
+5
°
to +50
°
C
(41
°
to 122
°
F)
Non-operating Temperature:
-30
°
to +90
°
C
(-22
°
to 194
°
F)
Operating Humidity:
5% to 95% (non-condensing)
Table 2-1. Power Requirements
Model
Voltage Range
Frequency
Range
SEH-22/SEH-24
100-125 VAC
or
200-240 VAC
50-60 Hz
SEH Book Page 6 Tuesday, March 19, 1996 4:12 PM