Publication No. GBX24-0HH/2
Specifications 39
A.2 Electrical Specification
Power
‐
supplies
and
ground
are
shared
between
the
connectors.
CAUTION
Only use the GBX24 in backplanes that supply power on both the J1 and J2 connectors. Use of
backplanes that supply power on the J1 connector only may cause excessive current to be drawn
through the power pins.
A.2.1 Power Requirements
The
GBX24
require
up
to
45
W
(9
A
at
+5
V),
allowing
for
in
‐
rush
considerations
etc.
The
approximate
power
requirements
are
calculated
as
shown
in
Table
A
‐
2.
Table A-2 Power Requirements
Configuration
Power (Watts) Current @ 5V
No ports connected
23
4.6 A
Per copper Gigabit port connected 0.8
0.16 A
Per fiber port connected
0.5
0.1 A
24 copper ports
42
8.4 A
20 copper ports, 4 fiber ports
41
8.2 A
A.2.2 Voltage Requirements
+5
V
+5
%
‐
2.5
%
DC
total
excursion,
including
all
transients
Vripple
(+5
)
=
50
mV
RMS
maximum
contained
in
the
total
excursion.
