Information Technology Reference
In-Depth Information
Bus specification
Bus
Max.
throughput
Data bus
(bits)
Address bus
(bits)
Notes
AGP
500 MB/s
64
32
EISA
32 MB/s
32
32
4 GB max address,
8MHz clock
Ethernet
1.25 MB/s
1
N/A
10 Mbps (10BASE)
Fibre
Channel
132.5 MB/s
1
N/A
1.06 Gbps
Firewire
50 MB/s
1
N/A
400 Mbps (S400)
IDE
16.6 MB/s
16
N/A
Mode 4, EIDE, Maximum 4 devices
IEEE-488
1 MB/s
8
N/A
ISA
16 MB/s
16
24
16 MB max address, 8 MHz clock
ISDN
16 kB/s
1
N/A
2
×
64 kbps
MCA
100 MB/s
32
32
Modem
7 kB/s
1
N/A
56 kbps
Parallel port
150 kB/s
8
N/A
150 kB/s is equivalent to 1.2 Mbps
which is the required transfer rate
for stereo, 44.1kHz, 16-bit sampled
audio
Parallel port
(ECP/EPP)
1.2 MB/s
8
N/A
×
8
PC
8 MB/s
8
20
1 MB max address, 8 MHz clock
PCI
132 MB/s
32
32
33 MHz clock
PCI (32-bit)
132 MB/s
32
32
33 MHz clock
PCI (64-bit)
264 MB/s
64
32
33 MHz clock
PCMCIA
16 MB/s
16
26
64 MB max address
RS-232
14.4 kB/s
1
N/A
115.2 kbps
RS-485
1.25 MB/s
1
N/A
10 Mbps
SCSI
(Fast/wide)
40 MB/s
16
N/A
20 MHz clock
SCSI-I
5 MB/s
8
N/A
SCSI-II
(Wide)
20 MB/s
16
N/A
10 MHz clock
SCSI-II (Fast)
10 MB/s
8
N/A
10 MHz clock
USB
1.5 MB/s
1
N/A
12 Mbps
VL
132 MB/s
32
32
33 MHz clock
F.1 Notes from the author
Well, the topic in nearly finished, so as a last little bit of fun here is a final league table for
the busses. They are graded on usefulness (how useful it is in its application, and how well it
can be used on other systems), availability (the ease that it can be purchased, and the num-
ber of applications that it has), data throughput (the speed of data throughput), cost (how
expensive it is to purchase applications which use the bus) and configuration (how well and
how easy it is to configure the bus).
From the table it can be seen that the winners are the PCI bus and Ethernet (100BASE).
