Bandwidth Key Words: DS1, T-1, DS2, T-2, DS3, T-3, DS4, T-4, OC-1, OC-3, OC-12, OC-48, ATM, Bandwidth Resources, MPLS, Satellite, Internet and Bandwidth Speeds.

Explaining Bandwidth The Easy Way.

Hopefully, this will clear up and make some sense of some “Buzz words” that are commonly used.

  • T1 or DS-1 is the equivalent of 24 phone lines—a T1 handle 1.5 million bits per second [1.5Mbps]. The keyword is BITS, not bytes. Bits are much smaller than bytes and will vary compared to a byte. A bit is One – A byte can be 4,8,10,12,16, depending on what we are discussing – The telecommunications industry uses bits – so we do too. Please never confuse the two. From a PC standpoint, 8 bits equal one byte.
  • T2 or DS-2 – This is the equivalent of 4 T1s. The capacity is 6.3 million bits per second [6.3Mbps]
  • T3 or DS-3 – This is the equivalent of 28 T1s. The capacity is 45 million bits per second [45Mbps]
  • T4 or DS-4 – This is the equivalent of 6 T3s. The capacity is 274 million bits per second [274Mbps]. Sprint currently uses DS-4 for the backbone.
  • OC-1 – Sometimes called SONET. OC-1 uses ATM switches [as all OC-X does] and runs at 51 million bits per second [51Mbps]. Uses Fiber
  • OC-3 is the equivalent of 155 million bits per second [155Mbps]. MCI currently runs a few of these on its backbone.
  • OC-12 – 600 million bits per second [600 Mbps]
  • OC-48 – 2.4 gigabits per second [2.4 Gbps]

Frame Relay – Dead and gone as far as the Internet is concerned. Especially with the bandwidth requirements the way they are. Frame relay runs around 64kbps to 1.5Mbps [64,000 bits per second to 1.5 million bits per second]. Frame Relay is a shared line with other people, and your bandwidth depends on the current utilization of the line.

ATM – Asynchronous Transfer Mode. ATM is a costly switching solution that is used to carry OC-3 and OC-12 lines.

Connection TypeBits per SecondBytes per SecondThe download time of 5 Megs
14.4 Modem14,4001,60052 minutes
28.8 Modem28,8003,20026 minutes
33.6 Modem33,6003,80022 minutes
56k Line57,6007,16812 minutes
64k 1 ISDN B Channel65,5358,19210 minutes
128k 2 ISDN B Channels131,07216,3845 minutes
T1/DS11,536,000192,00043 seconds
T2/DS26,144,000768,0007 seconds
T3/DS346,080,0005,760,0001 second
T4/DS4276,480,00034,560,0000.2 seconds
Sonet/OC151,000,0006,380,0000.9 seconds
Sonet/OC3155,000,00019,370,0000.5 seconds
Sonet/OC12600,000,00075,000,0000.15 seconds
Originally by Dennis Cox From The Develop Company at Internet Global


Bandwidth Coverage Area

Unlike DSL and other broadband technologies limited to densely populated areas, T1 Bandwidth service is available just about anywhere with a phone line. T1 Bandwidth, also known as DS1 Bandwidth, uses repeaters to boost the signal strength of the transmission – allowing it to travel up to 50 miles away from the nearest Central Office location. Our coverage area includes all of the United States.

Bandwidth Key Words: Exploring the Different Types and Speeds of Internet Connectivity

In today’s digitally connected world, understanding bandwidth and its various key terms is essential. Bandwidth refers to the capacity of a network or internet connection to transmit data. It determines how much information can be sent and received within a given timeframe. This article explores the key words associated with bandwidth, including DS1, T-1, DS2, T-2, DS3, T-3, DS4, T-4, OC-1, OC-3, OC-12, OC-48, ATM, Bandwidth Resources, MPLS, Satellite, Internet, and Bandwidth Speeds. By gaining insights into these terms, readers can better understand the different types and speeds of internet connectivity available today.

  1. DS1 and T-1:
    DS1 and T-1 are terms used interchangeably to describe a digital transmission service that provides a dedicated connection and data rate of 1.544 Mbps. It is widely used for voice and data transmission over traditional copper lines.
  2. DS2 and T-2:
    DS2 and T-2 represent a digital transmission service that offers a data rate of 6.312 Mbps. This higher-speed option is suitable for applications that require increased bandwidth, such as video conferencing and multimedia streaming.
  3. DS3 and T-3:
    DS3 and T-3 refer to a digital transmission service that provides a data rate of 44.736 Mbps. This high-capacity connection is commonly used by businesses and service providers for large-scale data transfer and high-speed internet access.
  4. DS4 and T-4:
    DS4 and T-4 represent a digital transmission service with an impressive data rate of 274.176 Mbps. These ultra-high-speed connections are typically utilized by enterprises, data centers, and telecommunications carriers to handle massive data loads.
  5. OC-1, OC-3, OC-12, OC-48:
    Optical Carrier (OC) is a term used to describe the transmission rates of synchronous optical networks (SONET) and Synchronous Digital Hierarchy (SDH) networks. The numbers following OC represent the data rates, with OC-1 at 51.84 Mbps, OC-3 at 155.52 Mbps, OC-12 at 622.08 Mbps, and OC-48 at 2.488 Gbps.
  6. ATM (Asynchronous Transfer Mode):
    ATM is a networking technology that transmits data in small, fixed-size cells. It supports multiple types of traffic, including voice, video, and data, and allows for efficient bandwidth allocation and prioritization of traffic.
  7. Bandwidth Resources:
    Bandwidth resources refer to the available capacity for data transmission in a network. These resources can be allocated and managed to ensure optimal performance and efficiency.
  8. MPLS (Multi-Protocol Label Switching):
    MPLS is a routing technique used in telecommunications networks to direct and prioritize data traffic. It improves network performance, quality of service, and traffic management by assigning labels to packets and routing them along pre-established paths.
  9. Satellite Internet:
    Satellite internet utilizes satellite technology to provide internet connectivity to areas where traditional terrestrial options may be limited. It enables users to access the internet from remote locations using satellite dish receivers.
  10. Internet and Bandwidth Speeds:
    Internet speeds refer to the rate at which data is transmitted over an internet connection. Bandwidth speeds, on the other hand, measure the capacity or amount of data that can be transmitted within a given time. Higher internet speeds and wider bandwidths result in faster data transfers and improved user experiences.

Understanding the key words related to bandwidth and internet connectivity is essential for navigating the ever-evolving digital landscape. From DS1 to T-4, OC-1 to OC-48, and ATM to MPLS, each term represents a different level of bandwidth capacity and speed. By familiarizing ourselves with these terms, we can make informed decisions about the types of connections and services that best suit our needs. Whether it’s for personal use, business operations, or service providers, having a clear understanding of bandwidth and its associated terms empowers us to harness the full potential of our digital connections.