|
Type A USB Port and Connector
(connects to computer)
Type B USB Port and Connector
(connects to peripheral )
| USB can accommodate: * Input Devices -
keyboards - mice - joysticks - graphics tablets
* Storage Devices - floppy drives - hard
drives - removable storage drives * Printing
Devices - ink jet printers - laser printers
* Imaging Devices - Scanners - Digital Cameras
- Displays * Telephony Devices - modems
- speakerphone modems * Connectivity Devices
- hubs |
|
What is USB?
Universal Serial Bus (USB) is a periheral bus standard
that allows you to connect a variety of peripheral devices
to your computer. Many Macintosh computers use Small
Computer Standard Interface (SCSI), Apple Desktop Bus
(ADB), and serial connections to connect peripheral
devices. USB will eventually replace these standards.
The iMac
is the first Macintosh to incorporate this standard.
Universal Serial Bus offers:
plug-and-play flexibility
standard connectors and cables, so there will be a
wide variety of solutions available to Apple customers
automatic configuration of devices as soon as they
are connected
hot swapping (the connecting and disconnecting of
devices while the computer is on)
ability to have multiple devices run simultaneously
on one computer, it can support up to 127 devices!
Using Older Devices With New USB Standard
Ethernet adapters will be available that will allow
you to connect LocalTalk devices to iMac. And Apple
also expects adapters to be available for some serial
devices. However, Apple does not expect adapters to
become available for SCSI devices, and Apple does not
support or recommend the use of any ADB devices on iMac,
even though some third parties have announced plans
to make such adapters or "dongles" available.
|
|
Technology
|
Theoretical Maximum Throughput
Megabits
|
Theoretical Maximum Throughput
Megabytes
|
Used For
|
|
Apple Desktop Bus
|
0.01 Mbps or 10 Kbps
|
0.0013MBps
|
input devices like mice, keyboards, joysticks, etc
|
|
Serial Port
|
0.23 Mbps or 230 Kbps
|
0.029MBps
|
printers, telephony devices, modems, etc
|
|
USB at low data transfer rate
|
1.5 Mbps
|
0.19MBps
|
most devices
|
|
Geoport Port
|
2 Mbps
|
0.25MBps
|
Geoport modem
|
|
10Base-T
|
10 Mbps
|
1.25MBPS
|
Laser printers, network connections, etc
|
|
USB at high transfer rates
|
12 Mbps
|
1.5MBps
|
most devices
|
|
SCSI
|
40 Mbps
|
5MBps
|
hardrives, removable storage, scanners, etc
|
|
Fast
SCSI
|
80 Mbps
|
10MBps
|
high performance drives
|
|
100Base-T
|
100 Mbps
|
12.5MBps
|
Laser printers, network connections, etc
|
|
Ultra
SCSI
|
160 Mbps
|
20MBps
|
high performance drives
|
|
Wide
Ultra SCSI
|
320 Mbps
|
40MBps
|
high performance drives
|
|
Ultra2
SCSI
|
320 Mbps
|
40MBps
|
high performance drives
|
|
FireWire
|
400 Mbps
|
50MBps
|
hard drives, scanners, digital video
|
|
USB 2.0 (Intel)
|
480 Mbps
|
60MBps
|
Standard due in late 2000 or early 2001
|
|
Wide
Ultra2 SCSI
|
640 Mbps
|
80MBps
|
high performance drives
|
|
FireWire
|
800 Mbps
|
100MBps
|
hard drives, scanners, digital video
Now available (3/21/00)
|
|
Ultra3
SCSI
|
1280 Mbps
|
160MBps
|
high performance drives
|
|
FireWire
|
1600 Mbps
|
200MBps
|
hard drives, scanners, digital video
(Design spec up and running 3/21/00)
|
