Business T1 Lines
A T1 line is a dedicated, symmetrical 1.5 Mbps circuit delivered straight from the carrier ... rock-solid, backed by a hard SLA, and available almost anywhere copper runs. Sometimes called a T1 connection or DS1, it is legacy technology, but for guaranteed connectivity, point to point links, and voice it stays in service across the country.
How a T1 line works
A T1 carries 24 channels of 64 Kbps over copper, point to point to the carrier. It can run data, voice (as a PRI), or both at once (integrated). Need more? Bonded or multiple T1 lines combine circuits for 3, 4.5, or 6 Mbps.
Typical T1 pricing
Real pricing depends on your address, the carriers there, and your term. The fastest way to a real number is to let providers quote you.
Is it right for you?When it fits
✓ Great fit
Sites where fiber is not available, businesses that need a guaranteed SLA on a modest connection, point to point links between offices, and voice-plus-data over one circuit (integrated T1). Its reliability is why it persists.
● Consider instead
If you need real bandwidth or better value per Mbps, modern fiber, cable, or fixed wireless deliver far more for the money. A T1 line is best when guaranteed availability matters more than raw speed.
How it compares
Fiber is vastly faster and cheaper per Mbps; a T1 line wins only on near-universal availability and a hard SLA.
A T1 connection is symmetrical and guaranteed; DSL is asymmetrical and best-effort.
Wireless installs fast and beats T1 on bandwidth; a T1 line offers a long track record and SLA.
What to look for
- ✓Bonding. Combine T1 lines for more bandwidth if you need it.
- ✓Voice, data, or both. An integrated T1 carries phone lines and internet together.
- ✓SLA + repair time. The reason to buy a T1 line ... confirm the terms.
- ✓Term. T1 contracts often run 1-3 years.
Common questions
How fast is a T1 line?
1.5 Mbps symmetrical for a full T1; bonded T1 lines reach 3-6 Mbps.
How much does a T1 line cost?
Typically $350-700/month for a full T1, less for fractional, more for bonded or multiple T1 lines.
What is the difference between a T1 line and a T1 connection?
Nothing ... T1 line, T1 connection, and DS1 all name the same 1.5 Mbps dedicated circuit.
Can a T1 line be used for point to point access?
Yes. A T1 line can link two locations directly as a private point to point connection, separate from internet access.
What is a bonded or multiple T1?
Bonding combines two or more T1 lines into one connection for 3, 4.5, or 6 Mbps ... more bandwidth without leaving T1.
Is a T1 line dedicated or shared?
Dedicated. The full bandwidth of a T1 connection is reserved for your business and never shared.
Is a T1 line obsolete?
Largely superseded by fiber and cable, but still used where those are unavailable or where its SLA and point to point reliability are required.
The T1 line, explained
A T1 line ... sometimes called a T1 connection or a DS1 ... is a dedicated digital circuit that carries 1.5 Mbps of symmetrical bandwidth over copper, straight from the carrier to your building. Because the line is dedicated and never shared with other businesses, a T1 connection delivers consistent speed, low latency, and a guaranteed service-level agreement. That reliability is why T1 lines remain in service for business internet, point to point links, and voice long after faster technologies arrived.
A single T1 line is built from 24 channels of 64 Kbps. Those channels can carry data, voice, or both at once, which is what makes the T1 connection so flexible. Need more than 1.5 Mbps? Two or more T1 lines bond together into one larger connection. Need phone service? The same T1 line can be provisioned as a PRI to deliver up to 23 concurrent voice channels.
Types of serviceTypes of T1 line service
What businesses use a T1 line for
- ✓Dedicated business internet. A guaranteed T1 connection where fiber and cable are unavailable, backed by a hard SLA.
- ✓Point to point access. A T1 line can connect two offices directly, a private link that never touches the public internet.
- ✓Voice trunking. Provisioned as a PRI, a single T1 line delivers up to 23 simultaneous phone lines.
- ✓Integrated voice and data. One integrated T1 connection carries both internet and telephone for a smaller office.
- ✓Backup and failover. A T1 line makes a reliable secondary circuit behind a primary fiber or cable connection.
What a T1 line delivers
A T1 connection is a 24-channel circuit that delivers a stable, reliable 1.5 Mbps straight from the carrier backbone ... a fit for small and medium businesses running roughly 20 to 50 internet users. Depending on your location and provider availability, a full T1 line is normally priced between $350 and $1,200 per month.
The connectivity ladderHow a T1 line compares, and where to go next
From shared DSL up to enterprise fiber, here is how each connection stacks up and the businesses it fits. When you outgrow a full T1 line, the next rungs are bonded or multiple T1 lines, a T3/DS3 connection, and the optical carriers.
| Service | Connection details |
|---|---|
| Business DSL | 256 Kbps to 1.5 Mbps connection - shared line for 5 to 50 users. |
| Fractional T1 | 256 Kbps to 768 Kbps connection - dedicated line for 5 to 20 users. |
| Integrated T1 Line | 128 Kbps to 1.5 Mbps line - dedicated connection for 5 to 30 users plus voice lines. |
| Full DS1 / T1 Connection | 1.5 Mbps broadband line - dedicated provider line for 20 to 50 users. A T1 connection can also be used for point to point access. |
| Multiple T1 Lines | 1.5 to 6 Mbps connection - dedicated lines for 50+ users and/or high bandwidth applications. Multiple T1 lines can also be used for point to point access. |
| DS3 / T3 Connection | 45 Mbps connection - dedicated line for 100+ users and/or high bandwidth applications. DS3 / T3 connections also have the ability to be used for point-to-point access. |
| OC3 Connection | 155 Mbps connection - fiber or dark fiber line for enterprise applications. An OC3 connection will also support point-to-point access. |
Business T1 Lines, city by city
Compare providers in metros nationwide:
Plus more metros in the full directory below.