Bandwidth

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9600 baud is about a screen per second of text

A 9600 "baud" connection is a little less than 1K per second. That's about 1 screen full of human text on an 80x24 terminal every second. ... Really, if every line was filled solid that's about one full screen every 2 seconds. Typical text for humans averages using only 1/2 the screen.

16550 UART

16550 UART chips can handle up to 115.2 kbit/s (115200 bps)

Bandwidth comparisons

kbps = kbit/s = kbits per second = thousand bits per second

MBps = MByte/s = MByte per second = megabytes per second

Connection Bits per second Bytes per second Real World Expected Throughput
TTY (V.18) 0.045 kbit/s TTY uses a Baudot_code code, not ASCII. This uses 5 bits per character instead of 8, plus one start and 1.5 stop bits (7.5 total bits per character sent). 6 characters per second
Modem 300 (300 baud) (Bell 103 or V.21) 0.3 kbit/s 0.03 kB/s (30 characters per second ~ about reading speed)
serial 9600 8N1 (close to V.32 9600 baud) 9.6 kbit/s
(10 bits per word)
0.96 kB/s (960 Bytes/s)
Modem 56k (V.92) 56.0/48.0 kbit/s 5.6/4.8 kB/s
serial 57600 8N1 57.6 kbit/s
(10 bits per word)
5.76 kB/s (5760 Bytes/s)
serial 115200 8N1 115.2 kbit/s
(10 bits per word)
11.52 kB/s (11520 Bytes/s)
DS1/T1 1.544 Mbit/s 0.192 MB/s
T2 6.312 Mbit/s 0.789 MB/s
T3 44.736 Mbit/s 5.5925 MB/s
OC1 51.84 Mbit/s 6.48 MB/s
OC3 155.52 Mbit/s 19.44 MB/s
Ethernet (10base-X) 10 Mbit/s 1.25 MB/s 6 Mbit/s (0.75 MB/s)
Fast Ethernet (100base-X) 100 Mbit/s 12.5 MB/s 60 Mbit/s (7.50 MB/s)
Gigabit Ethernet (1000base-X) 1000 Mbit/s 125 MB/s 600 Mbit/s (75 MB/s)
Bluetooth 2.0+EDR 3 Mbit/s 0.375 MB/s
802.11b 11.0 Mbit/s 1.375 MB/s
802.11a 54.0 Mbit/s 6.75 MB/s
802.11g 54.0 Mbit/s 6.75 MB/s
802.11n 248.0 Mbit/s 31 MB/s
PCI 32-bit/33 MHz 1067 Mbit/s 133.33 MB/s
PCI 64-bit/100 MHz 6399 Mbit/s 800 MB/s
Serial ATA (SATA-150) 1500 Mbit/s 187.5 MB/s
Serial ATA (SATA-300) 3000 Mbit/s 375 MB/s
Serial Attached SCSI (SAS) 3000 Mbit/s 375 MB/s
RS-232 Serial max 0.2304 Mbit/s 0.0288 MB/s
USB 2.0 (USB Hi-Speed) 480 Mbit/s 60 MB/s
eSATA (SATA 300) 2400 Mbit/s 300 MB/s
USB 3.0 4.80 Gbit/s 600 MB/s
PC2100 DDR-SDRAM (single channel) 16.8 Gbit/s 2.1 GB/s
PC3200 DDR-SDRAM (single channel) 25.6 Gbit/s 3.2 GB/s
PC2100 DDR-SDRAM (dual channel) 33.6 Gbit/s 4.2 GB/s
PC3200 DDR-SDRAM (dual channel) 51.2 Gbit/s 6.4 GB/s