Apple Logic Pro 8 - Manual (Page 89)

Chapter 4 Setting Up Your System 89
There are two kinds of USB connectors:
 A connector, typically used to connect a device to a USB hub.
 B connector, typically used to connect devices together, and also to connect a device
to a computer.
Note: USB audio interfaces should always be directly connected to your computer, not
via a hub or to the computer’s display, keyboard, or another peripheral.
PCI
PCI (Peripheral Component Interconnect) interfaces, unlike FireWire and USB interfaces,
require that you install a dedicated card in your computer. PCI provides extremely high
bandwidth and fast data-transfer rates, allowing you to record and play back large
numbers of files at the highest possible sample rates and bit depths.
ExpressCard
ExpressCard is an updated version of PC Card (PCMCIA) or CardBus, found on MacBook
Pro computers. ExpressCard is much like the PCI interfaces described above, but the
cards slide into a slot on the outside of your notebook. Express Cards and PC Cards
available include audio interfaces, hard disks, networking, and SCSI interfaces, wireless
adapters, and more.
Audio Cabling
The following types of audio cables and connectors are usually used on professional
and consumer audio equipment:
 XLR
 1/4-Inch audio and 1/8-Inch miniplug
 RCA (Cinch)
 Toslink
 AES-EBU, S/PDIF, ADAT
XLR
XLR cables and connectors are used on professional-quality microphones, monitors,
and other musical equipment. They provide a high-quality, balanced signal at +4 dB
level.
USB (Universal Serial Bus)
XLR connector (balanced)