Apache Systems Inc
As T1s can be broken into channels, voice & data can run side by side on the same circuit. This requires a device to convert the signaling on the T1 into signaling that can be used by the phone, by the router. The technical name for this process is multiplexing and the equipment required is called a multiplexer; it is known more commonly as a channel bank, CSU/DSU or T1 card. In the case of an intergrated one, the service can be run from the phone company's jack into the channel bank where the voice service is terminated and a jack for the data service is located. The benefits of using an intergrated version include lower rates for long distance, additional lines for long distance and toll free calling and the ability to bundle your data and phone costs on the same bill and same circuit. Nearly all providers are capable of offering intergrated voice and data products, some can even bundle local, long distance and data all on the same circuit.
The four most common uses of a T1 line include:
What is the difference between a DSL
connection and an Internet T1 line?
The primary difference between DSL and a T1 is in the level of over
subscription that occurs before the service reaches the end user. When you
purchase a full T1 of Internet access, what you are generally getting is
access to 1.544 Mbps of transmission on the carrier's network, regardless of
what other customers are transmitting and receiving. To better illustrate
this, let's assume that a carrier has capacity for 150 Mbps at any given
time. This means that the at the most, they would sell is 100 T1s; Tier One
carrier networks are seldom oversubscribed. For every megabyte of capacity,
they can sell one megabyte access to a customer.
DSL works differently - and costs less - because of over subscription. When
you use a DSL connection your service runs through a piece of equipment
called a DSLAM, as opposed to running directly into the Internet. The DSLAM
acts as a point of aggregation between the DSL subscribers and the direct
connection to the Internet (normally a T1 or DS-3). Typical DSL over
subscription rates run from 4:1 to 25:1. Or in other words, for every one
megabyte of demand coming into the DSLAM, a fraction of that is available.
The benefit to this design is that a DSL provider can provide a 2 Mbps
connection for a fraction of the T1 price. The disadvantage is that when the
DSLAM gets busy, your connection speed will slow considerably.
T3 - comprised of 28 T1 lines
A T3 line (also know as a DS-3) is an ultra high-speed connection capable of
transmitting data at rates up to 45 Mbps. A T3 line is equal to
approximately 672 regular voice-grade telephone lines, which is fast enough
to transmit full-motion, real-time video, and very large databases over a
busy network. A T3 line is typically installed as a major networking artery
for large corporations and universities with high-volume network traffic. A
T3 is the second fastest, non optical connection offered in North America. A
T3 line is comprised of 28 T1 lines, each operating at total signaling rate
of 1.544 Mbps.
What is the difference between T1s and T3s?
The most significant differences between T1 lines and T3 lines are cost and
speed. The typical T1 connection costs approximately $800 per month while a T3
connection can cost as much as $15,000 per month. T3 lines are extremely high
bandwidth connections into a carrier's backbone. They typically include SLAs
(Service Level Agreements) that guarantee uptime and performance.
The New Kid ON THE BLOCK IS 100 MBS ethrenet .This is two times faster then the T3 . Yet the price is almost a 100 times less. It is a revolution in ISP. So once again we will see fiber optics use go up and telco are going to see diminishing returns. Cisco will be selling more terabit routers. As these new lines will run on OC backbones.
Watch out 1000MBS service to business is already avaliable! Yes still cheaper then a T3.
