IBM 4800-741 Hardware Service Guide - Page 38

Powered, connectors

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Updated July 14, 2008 Powered USB connectors The powered USB connectors provide additional power from the host to devices that require more power than is available from the USB standard Type A connector. As shown in Figure 13, additional power is supplied through another set of contacts that are contained within the powered USB connector. The powered USB receptacle consists of two connectors that are integrated within a common shielded housing. These two connectors are stacked vertically inside the common housing. The upper connector contains four contacts that are used for powering the attached device. The lower connector is a fully compliant USB Type A connector capable of mating with either a standard USB Type A plug or a powered USB plug. In other words, the bottom half of the connectors are standard USB Type A ports to which USB I/O devices can be attached. A B Figure 13. Example of the powered USB port. A is the power section of the connector and B is the standard USB section of connector. Powered USB connectors provide the following features: v Additional power for USB POS I/O devices needing more than 5 V. v Unique keying and color coding of the 12-V and 24-V connectors, which prevents unintentionally attaching a connector to the wrong type of port. v Positive mechanical retention latch between the plug and receptacle to prevent inadvertent disconnections. Non-POS I/O devices The SurePOS 720 support most of the following non-POS I/O devices: v Many, but not all, USB mass-storage devices such as diskette drives, CD-ROM, and memory key. Lack of standardization precludes a list of the devices that are not supported. Boot mode is supported for most devices that support USB boot. v IBM VGA monitors (CRT and LCD) v Industry-standard PC keyboards, mice, and printers v Standard USB and RS-232 devices with appropriate drivers, software, and operating systems 20 SurePOS 700 Series: SurePOS 700-721/741/781, 722/742/782 Hardware Service Guide

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Powered
USB
connectors
The
powered
USB
connectors
provide
additional
power
from
the
host
to
devices
that
require
more
power
than
is
available
from
the
USB
standard
Type
A
connector.
As
shown
in
Figure
13,
additional
power
is
supplied
through
another
set
of
contacts
that
are
contained
within
the
powered
USB
connector.
The
powered
USB
receptacle
consists
of
two
connectors
that
are
integrated
within
a
common
shielded
housing.
These
two
connectors
are
stacked
vertically
inside
the
common
housing.
The
upper
connector
contains
four
contacts
that
are
used
for
powering
the
attached
device.
The
lower
connector
is
a
fully
compliant
USB
Type
A
connector
capable
of
mating
with
either
a
standard
USB
Type
A
plug
or
a
powered
USB
plug.
In
other
words,
the
bottom
half
of
the
connectors
are
standard
USB
Type
A
ports
to
which
USB
I/O
devices
can
be
attached.
Powered
USB
connectors
provide
the
following
features:
v
Additional
power
for
USB
POS
I/O
devices
needing
more
than
5
V.
v
Unique
keying
and
color
coding
of
the
12-V
and
24-V
connectors,
which
prevents
unintentionally
attaching
a
connector
to
the
wrong
type
of
port.
v
Positive
mechanical
retention
latch
between
the
plug
and
receptacle
to
prevent
inadvertent
disconnections.
Non-POS
I/O
devices
The
SurePOS
720
support
most
of
the
following
non-POS
I/O
devices:
v
Many,
but
not
all,
USB
mass-storage
devices
such
as
diskette
drives,
CD-ROM,
and
memory
key.
Lack
of
standardization
precludes
a
list
of
the
devices
that
are
not
supported.
Boot
mode
is
supported
for
most
devices
that
support
USB
boot.
v
IBM
VGA
monitors
(CRT
and
LCD)
v
Industry-standard
PC
keyboards,
mice,
and
printers
v
Standard
USB
and
RS-232
devices
with
appropriate
drivers,
software,
and
operating
systems
A
B
Figure
13.
Example
of
the
powered
USB
port.
±A²
is
the
power
section
of
the
connector
and
±B²
is
the
standard
USB
section
of
connector.
Updated
July
14,
2008
20
SurePOS
700
Series:
SurePOS
700-721/741/781,
722/742/782
Hardware
Service
Guide