Convert OC-3 Lines to Ethernet

OC-3 (OC-3) to Ethernet (10BASE-T) data transfer rate conversion — enter any value below to get an instant result, or use the table for common values.

Results from this calculator are estimates provided for general informational purposes only, based on formulas, rates, and standards commonly accepted as of 2026. Figures may differ slightly from other calculators or professional sources due to rounding methods, differing assumptions, or regional regulations, and rules may change over time. Always consult a qualified professional — such as a financial advisor, healthcare provider, or other relevant specialist — before making decisions based on these results.

Value

From

Result

1 OC-3 = 15.552 10BASE-T

1 OC-3 = 15.552 Ethernet

1 Ethernet = 0.064300412 OC-3 Lines

1 OC-3 in every supported unit

Conversion chart: OC-3 to Ethernet

Conversion table

OC-3 (OC-3)	Ethernet (10BASE-T)
0.01 OC-3	0.15552 10BASE-T
0.1 OC-3	1.5552 10BASE-T
1 OC-3	15.552 10BASE-T
2 OC-3	31.104 10BASE-T
3 OC-3	46.656 10BASE-T
5 OC-3	77.76 10BASE-T
10 OC-3	155.52 10BASE-T
20 OC-3	311.04 10BASE-T
50 OC-3	777.6 10BASE-T
100 OC-3	1555.2 10BASE-T
1000 OC-3	15552 10BASE-T

OC-3 (OC-3)

Definition: An Optical Carrier level-3 line, running at exactly 3 times the OC-1 base rate — 155.52 megabits per second.

History: Introduced as part of the SONET fiber hierarchy's standardized rate ladder, OC-3 became one of the more commonly deployed lower tiers for telecom and early internet backbone links in the 1990s.

Current use: Used historically for mid-tier ISP backbone and telecom trunk connections, bridging the gap between T3-class copper circuits and the much larger OC-12 and OC-48 fiber tiers.

Ethernet (10BASE-T)

Definition: The original twisted-pair Ethernet standard, running at a fixed 10 megabits per second over copper cabling — the speed that defined "Ethernet" for its first two decades.

History: Ethernet itself was invented at Xerox PARC by Robert Metcalfe and colleagues in 1973, and the 10BASE-T twisted-pair variant was standardized as IEEE 802.3i in 1990, bringing the technology out of coaxial cable and into the RJ45 cabling still used today.

Current use: Now largely obsolete for new installations, but still a useful reference point for legacy equipment specifications and for understanding the naming pattern ("speed-BASE-medium") that later, much faster Ethernet standards continued.

Supported Units

Unit	Symbol	In bit/s
Bit/Second	bit/s	1 bit/s
Byte/Second	B/s	8 bit/s
Kilobit/Second	kbit/s	1000 bit/s
Kibibit/Second	Kibit/s	1024 bit/s
Kilobyte/Second	kB/s	8000 bit/s
Kibibyte/Second	KiB/s	8192 bit/s
Megabit/Second	Mbit/s	1000000 bit/s
Mebibit/Second	Mibit/s	1048576 bit/s
Megabyte/Second	MB/s	8000000 bit/s
Mebibyte/Second	MiB/s	8388608 bit/s
Gigabit/Second	Gbit/s	1E+09 bit/s
Gibibit/Second	Gibit/s	1.07374E+09 bit/s
Gigabyte/Second	GB/s	8E+09 bit/s
Gibibyte/Second	GiB/s	8.58993E+09 bit/s
Terabit/Second	Tbit/s	1E+12 bit/s
Tebibit/Second	Tibit/s	1.09951E+12 bit/s
Terabyte/Second	TB/s	8E+12 bit/s
Tebibyte/Second	TiB/s	8.79609E+12 bit/s
Ethernet	10BASE-T	10000000 bit/s
Fast Ethernet	100BASE-TX	1E+08 bit/s
Gigabit Ethernet	1000BASE-T	1E+09 bit/s
10 Gigabit Ethernet	10GBASE-T	1E+10 bit/s
Dial-Up Modem (56K)	56K	56000 bit/s
ISDN Single Channel	ISDN (B)	64000 bit/s
ISDN Dual Channel	ISDN (2B)	128000 bit/s
T1 Line	T1	1544000 bit/s
T3 Line	T3	44736000 bit/s
OC-1	OC-1	51840000 bit/s
OC-3	OC-3	1.5552E+08 bit/s
OC-12	OC-12	6.2208E+08 bit/s
OC-48	OC-48	2.48832E+09 bit/s
USB 1.1	USB 1.1	12000000 bit/s
USB 2.0 (Hi-Speed)	USB 2.0	4.8E+08 bit/s
USB 3.0 (SuperSpeed)	USB 3.0	5E+09 bit/s
FireWire 400	IEEE 1394	4E+08 bit/s

About These Parameters

Value: The data transfer rate you want to convert, expressed in the "From" unit. Accepts decimals, and can represent anything from a dial-up modem's 56K rate to a data center fabric's terabits per second.
From Unit: The unit your input value is currently measured in — an ISP's advertised megabit/s plan speed, a hardware spec sheet's USB or Ethernet rate, or a legacy T1/OC telecom line's fixed rate.
To Unit: The unit you want the result converted into. Use the swap button to flip From and To instantly, which is handy when converting an advertised bit/s internet speed into the byte/s a download manager will actually display.

How Data Transfer Conversion Works

The Formula

Every unit here is defined by a fixed multiplier relative to bit/s. To convert a value from one unit to another:

result = value × (factor of "From" unit ÷ factor of "To" unit)

For OC-3 → Ethernet: multiply by 15.552. For example, 1 OC-3 × 15.552 = 15.552 10BASE-T.

Bits vs. Bytes

Networking speeds are conventionally quoted in bits per second, while file sizes and download progress are conventionally shown in bytes per second — and since one byte is 8 bits, the two numbers for the same physical connection differ by a factor of 8. That's the entire explanation behind the classic complaint that a "100 Mbps" internet plan only downloads at around 12.5 MB/s: 100 megabits per second divided by 8 bits per byte is 12.5 megabytes per second, exactly as expected — no bandwidth is actually missing, it's simply being measured in a different unit than the one being displayed.

Decimal vs. Binary Prefixes

Just like data storage, data transfer has a decimal-versus-binary prefix split. Networking hardware, ISPs, and telecom standards use strict decimal SI prefixes — a megabit/s is exactly 1,000,000 bit/s — because bandwidth is fundamentally about signaling rate, which is tied to clock frequencies that are naturally decimal. The binary "kibi-, mebi-, gibi-, tebi-" prefixed units (powers of two: 1,024, 1,048,576, and so on) exist for the comparatively rarer contexts, such as internal memory-bus transfer rates, that are more naturally expressed as powers of two. The IEC formally standardized these binary prefixes in 1998 specifically to end the ambiguity that plagued terms like "kilobyte" and "megabit" when both a decimal and a binary meaning were in common use for the same word.

Named Network Standards

Many of the units on this page aren't SI-prefixed multiples at all, but fixed rates from real networking and telecom history. Ethernet's original 10 megabit/s spec traces back to Robert Metcalfe's work at Xerox PARC in 1973, standardized in 1980, and later Ethernet generations (Fast, Gigabit, 10 Gigabit) each multiplied that baseline by a fixed factor. The T1 line, still the reference unit telecom engineers use for bandwidth commitments today, was AT&T's original digital telephone trunk standard from the 1960s. The Optical Carrier (OC) levels are all whole multiples of the SONET fiber hierarchy's OC-1 base rate, and USB and FireWire generations each represent a fixed peripheral-bus speed tier from computing history. Converting one of these named standards into a modern SI unit is exactly what this page is for — plugging a legacy spec sheet's line rate directly against a current broadband or local-network speed.

Example

A data transfer rate of 1 OC-3 equals 15.552 10BASE-T. For scale, a typical home fiber internet plan runs around 500-1,000 megabits per second (roughly 62-125 megabytes per second), a Gigabit Ethernet port tops out at 1,000 megabits per second, and a 56K dial-up modem from the 1990s managed only 56 kilobits per second — well under one hundredth of one percent of a modern gigabit connection.

Frequently Asked Questions

How many Ethernet are in 1 OC-3?

1 OC-3 (OC-3) equals exactly 15.552 Ethernet (10BASE-T).

Why does my "100 Mbps" internet only download at about 12 MB/s?

Internet plans are advertised in megabits per second (Mbit/s or Mbps), while download managers and file transfers show speed in megabytes per second (MB/s). Since one byte equals 8 bits, dividing the advertised bit rate by 8 gives the byte rate you'll actually see: 100 Mbit/s ÷ 8 = 12.5 MB/s. No bandwidth is missing — it's simply measured in a different, 8-times-smaller-looking unit.

What's the difference between data transfer rate and data storage?

Data transfer rate (bit/s, byte/s, and their prefixed multiples) measures how fast data moves across a link over time — it's a speed. Data storage (bit, byte, kilobyte, and so on) measures a fixed amount of data sitting at rest, like a file's size or a drive's capacity — it's a quantity, not a rate. This converter handles the "per second" transfer-rate units; a separate Data Storage Converter on this site handles the storage-amount units.

Why are there both kilobit and kibibit units?

A kilobit is exactly 1,000 bits, following the strict decimal SI prefix system that networking and telecom standards always use. A kibibit is exactly 1,024 bits (2^10), a binary prefix standardized by the IEC in 1998 for contexts where a rate is naturally a power of two, such as certain memory-bus interfaces. Consumer bandwidth — internet plans, Wi-Fi, mobile data — is universally quoted in the decimal kilobit/megabit/gigabit family, not the binary kibibit/mebibit/gibibit one.

How fast is a T1 line or an OC-3 line in modern terms?

A T1 line runs at a fixed 1.544 megabits per second — slower than a typical home Wi-Fi connection today, though it was once a business-grade dedicated line standard. An OC-3 line, part of the SONET fiber hierarchy, runs at 155.52 megabits per second, roughly 100 times faster than a T1. Both are legacy telecom rates useful mainly for converting an older spec sheet or contract's line rate into a modern megabit or gigabit per second figure for comparison.

Convert OC-3 to Other Data Transfer Units

OC-3 to Bits/Second OC-3 to Bytes/Second OC-3 to Kilobits/Second OC-3 to Kibibits/Second OC-3 to Kilobytes/Second OC-3 to Kibibytes/Second OC-3 to Megabits/Second OC-3 to Mebibits/Second OC-3 to Megabytes/Second OC-3 to Mebibytes/Second OC-3 to Gigabits/Second OC-3 to Gibibits/Second OC-3 to Gigabytes/Second OC-3 to Gibibytes/Second OC-3 to Terabits/Second OC-3 to Tebibits/Second OC-3 to Terabytes/Second OC-3 to Tebibytes/Second OC-3 to Ethernet OC-3 to Fast Ethernet OC-3 to Gigabit Ethernet OC-3 to 10 Gigabit Ethernet OC-3 to Dial-Up Modems (56K) OC-3 to ISDN Single Channels OC-3 to ISDN Dual Channels OC-3 to T1 Lines OC-3 to T3 Lines OC-3 to OC-1 Lines OC-3 to OC-12 Lines OC-3 to OC-48 Lines OC-3 to USB 1.1 Links OC-3 to USB 2.0 (Hi-Speed) Links OC-3 to USB 3.0 (SuperSpeed) Links OC-3 to FireWire 400 Links

Possible Data Transfer Conversions