Type Rate Additional info

BRI 128Kbps ISDN 2 64KB+1 16KD
PRI(na) 1.480Mbps ISDN 23B+1D (all 64K) ~ T1
PRI(eur) 1.930Mbps ISDN 30B+1D (all 64K) ~ E1

ADSL 640+Kbps up/
1.544+Mbps down
Asymmetric Digital Subscriber Line
Nonmatching send/receive transmission rates
HDSL 784+Kbps Typically matching send/receive rates, can reach T1 speeds
SDSL 768Kbps Single Line Digital Subscriber Line aka HDSL2
VDSL 19.2Mbps up/
51.84Mbps down
Very high rate Digital Subscriber Line
IDSL 128Kbps Effectively ISDN over low quality non-CAT5 copper
with no voice capabilities
RADSL ADSL Rate Adaptive Digital Subscriber Line
ADSL that automatically adapts rates depending on
transmission medium quality
ANSI T1.413 ADSL Official name for ADSL

T Carrier:
T1 1.544Mbps 24 DS0 channels, equivalent to 1 DS1
T1C 3.152Mbps 48 channels
T2 6.312Mbps 96 channels
T3 44.736Mbps 672 channels
T4 274.176Mbs 4032 channels
E1 2.048Mbps 30 64Kbps channels + 2 64Kbps D, aka European T1
DS0 64Kbps 1 channel, same rate in NA, Japan, and Europe
DS1 1.544Mbps 24 channels (T1)
DS1C 3.152Mbps 48 channels (T1C)
DS2 6.312Mbps 96 channels (T2)
DS3 44.736Mbps 672 channels (T3)
DS4 274.176Mbps 4032 channels (T4)
DS1 Japan 1.544Mbps 24 channels
DS2 Japan 6.312Mbps 96 channels
DS3 Japan 32.064Mbps 480 channels
DS4 Japan 97.728Mbps 1440 channels
DS5 Japan 400.352Mbps 5760 channels
DS1 Euro 2.048Mbps 30 channels + 2 D channels (E1)
DS2 Euro 8.448Mbps 120 channels + 2 D
DS3 Euro 34.368Mbps 480 channels + 2 D
DS4 Euro 139.268Mbps 1920 channels + 2 D
DS5 Euro 565.148Mbps 7680 channels + 2 D

Optical Carrier:
OC-1 51.48Mbps Optical Carrier SONET - All OC-n are 51.48*n Mbps
OC-3 155.52Mbps Optical Carrier SONET
OC-12 622.08Mbps Optical Carrier SONET
OC-48 2.4Gbps Optical Carrier SONET
OC-192 9.6Gbps Optical Carrier SONET
OC-256 13.1Gbps Optical Carrier SONET
OC-768 40Gbps Optical Carrier SONET
Switched56 56Kbps
Accunet 56Kbps AT&T
Centronics Parallel 200KB/s Standard PC parallel port
EPP 400KB/s Enhanced Parallel Port
ECP 2MB/s Extended Capabilities Parallel Port bidir, 8bit
HIPPI-32 100MB/s ANSI, 32 bit parallel
HIPPI-64 200MB/s ANSI, 64 bit parallel
IEEE 1284 2Mbps high speed centronics-like parallel
ESCON® 10MB/s IBM, Fiber, max 5.6 miles
P1394 400Mbps Firewire™, 63 devices max
USB 12Mbps 4 wire serial, 128 devices max
10Base2 10MB/s Thin coax 607 feet (bus)
10Base5 10MB/s Thick coax 1640 feet (bus)
10BaseT 10MB/s Twisted Pair 328 feet (star)
10BaseF 10MB/s Fiber 1.2 miles (star)
100BaseT 100MB/s Twisted Pair
Arcnet® 2.5Mbps
CDPD 19.2Kbps Cellular Digital Packet Data
DDS 56Kbps AT&T
FDDI 100Mbps ANSI, Fiber, 2 Kilometers max
FDSE 20Mbps Full Duplex Switched Ethernet
G.703 2.048Mbps
HSSI 53Mbps
Lattisnet® 10 Mbps Synoptics ethernet
LocalTalk® 230.4Kbps twisted pair
Starlan 1Mbps AT&T twisted pair
Type A Coax 2.35Mbps IBM, coax

Data collected from various sources including: Newton's Telecom Dictionary 13th ed., Black Box..., Byte Magazine, PC Magazine, ...

Using a file size of 1,000,000,000.00 bytes (1,000.00 Megabytes) the following download speeds are projected using standard calculations and demonstrating bandwidth use with a T1(1.5Mbps) as the standard.. Notice the faster OC speeds are ideal for voice, video, applications mirroring, disaster rocovery hotsite because the speeds of mirroring systems is relatively instantaneous. Using a private dark fiber MAN not only guarantees security of the system but the speed is only limited to the equipment at the end users site.

Connection Speed


56 K 56,000 bps


96% slower
128 K 128,000 bps


91% slower
256 K 256,000 bps


83% slower
512 K 512,000 bps


66% slower
768 K 768,000 bps


50% slower
T1, DS-1 1.544 Mbps


T3, DS-3 44.736 Mbps


2,798% faster
OC-3 155.520 Mbps


9,973% faster
OC-12 622.080 Mbps


40,191% faster
OC-48 2.488 Gbps


161,040% faster
OC-192 10 Gbps


647,569% faster