Gestetner B147, Service Manual

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USB
B147/B149/B190 6-118 SM
6.17 USB
6.17.1 SPECIFICATIONS
USB connectivity is provided as an option for this machine.
Interface: USB 1.1, USB 2.0
Data rates: 480 Mbps (high speed), 12 Mbps (full speed), 1.5 Mbps (low speed)
High speed mode is only supported by USB 2.0.
6.17.2 USB 1.1/2.0
USB (Universal Serial Bus) offers simple connectivity for computers, printers,
keyboards, and other peripherals. In a USB environment, terminators, device IDs
(like SCSI), and DIP switch settings are not necessary.
USB 1.1 provides the following features:
•
Plug & Play. As soon as a new device is connected via USB, the operating
system recognizes it, and the appropriate driver is installed for it automatically if
the driver is available. If the driver is not available, a message prompts the user
for the driver disk for immediate installation.
•
Hot swapping (cables can be connected and disconnected while the computer
and other devices are switched on)
•
No terminator or device ID required
•
Data rates of 12 Mbps (full speed), and 1.5 Mbps (low speed)
•
Common connectors for different devices
•
Bi-directional data communication between device and host computer via a 4-
byte header and DEVICE ID.
USB 2.0 is an evolution of the USB 1.1 specification. It uses the same cables,
connectors, and software interfaces so the user will see no change. It provides an
easy-to-use connection to a wide range of products with a maximum data rate of
480Mbps (high speed).
Up to 127 devices can be connected and 6 cascade connections are allowed.
Power is supplied from the computer and the maximum cable length is 5 m.