| What is a T1 line? | | | | lines. As I have mentioned in my previous posts, T1 |
| T1 lines are those specific types of copper or fiber | | | | lines were developed by the AT&T Bell Labs for the |
| optic telephone lines that can handle more data and | | | | usage of certain countries such as North America and |
| files in comparison to the traditional and conventional | | | | Korea. |
| telephone lines. Commonly known as the T-carrier | | | | But what is a T1 line exactly? How does it work? |
| lines, it was developed by the telecommunication's | | | | Well, T1 lines actually define four things: the |
| company AT&T Bell Labs for usage in countries such | | | | bandwidth or clock rate, the physical medium that are |
| as North America and Japan. | | | | being used, the type of signaling and encoding that |
| These twisted copper telephone lines have been | | | | are being used and lastly, the format or frame where |
| used as the standard line or connection for quite a | | | | data are being sent or transferred. |
| long time now. Back then, it was already used for | | | | To start off, T1 lines have a speed bandwidth of |
| the transmission of voice and data thru analog signals. | | | | 1.544 Mbps for one direction, alone. One of its |
| As of today, this standard is slowly upgrading to fiber | | | | biggest advantages is that owning a T1 line can give |
| optic lines that are made up of bundled glass fibers, | | | | you a truly dedicated bandwidth for both the uplink |
| however, most T1 lines are still made of twisted | | | | and downlink directions in a symmetrical manner. T1 |
| copper. T1 lines have the capacity of creating pipes | | | | lines by the way are not shared with other |
| which are capable of blowing through larger data | | | | customers which makes it possible for a high speed |
| streams. | | | | rate. |
| Now, while other people are having a grand time | | | | Two physical mediums are being utilized by a T1 line. |
| having a trip to their favorite local shopping mall, | | | | The first medium that is being used is based on a 100 |
| shopping for telecommunication services like that of a | | | | Ohm which is in a form of twisted and shielded |
| T1 line can also be fun and worthwhile. Now if you | | | | differential pair. The second medium, on the other |
| are looking for a dedicated voice line, you have the | | | | hand, is based on a 75 Ohm coaxial cable. Usually, |
| freedom of calling the local phone company. | | | | inside the patch panels of a 100 Ohm twisted pair is |
| However, chances are, you will be passed around | | | | oftentimes being used because it is not expensive |
| three to four personnel but still don't have any idea | | | | and it is also flexible. When being utilized for sending |
| or they cannot handle your request for T1 line. By | | | | data to the outside world, however, a balun is usually |
| the time you get to speak to the person who | | | | used so that it can match up with that of a 75 Ohm |
| knows about the T1 line, you still have to suffer in | | | | coaxial cable which is normally used in connecting to |
| going through a long litany of questions that still don't | | | | ISPs or PBX. |
| get to the point of your call which is actually how | | | | B8ZS which stands for Binary 8-zero Substitution is |
| much do you have to pay to enjoy a T1 internet line. | | | | the signal encoding device that is used by T1 lines. To |
| So, the cost of having a T1 line can be very | | | | avoid being too technical about it, it can just be |
| expensive. But you have to know that prices are | | | | simply described as a type of encoding which allows |
| dropping as long as the demand and the trend grow. | | | | the data and the clock to be sent to the same T1 |
| Internet Service Providers or the ISPs can lease T1 | | | | cable which is very crucial in order to have a |
| lines to provide services that are needed to their | | | | synchronized data transfer. |
| network of clients. There are also other multiplexed | | | | Finally, the format in which each T1 line is split into 24 |
| fiber optic lines such as T2 and T3 lines which has | | | | channels is referred to as the DSOs. Each of the |
| the capacity of transferring up to 44.436 Mbps. | | | | channels is 8 bits wide and the frame is being sent |
| Having a T3 line is even equivalent to 28 T1 lines and | | | | into a boundary of 8 KHZ. Hence, making the data |
| is being utilized by larger establishments that have | | | | capacity of 1.536 Mbps which is derived from the |
| higher data and voice demands - but that is another | | | | multiplication of the channels, 24x8x8000. Meanwhile, |
| story. More other advanced T-carriers also exist | | | | there is also this something called as the framing but |
| although they are not highly used. | | | | which consists of 1 bit for every frame that has the |
| But generally speaking, having a T1 internet line is not | | | | capacity to be locked on the other end so that there |
| a wise decision and not cost effective for personal | | | | is an assurance that whatever device there is, it can |
| or residential use. Small businesses and other | | | | extract DSOs in a correct manner. 8,000 bits per |
| organizations that are using PBX are the ones that | | | | second, once again is being added in this framing bit, |
| can greatly benefit from having a T1 line. | | | | which results to a grand total of 1.544 Mbps. |
| Types of T1 line | | | | Latest Updates on T1 lines |
| A T1 line is a kind of circuit that is used for voice or | | | | Knowing about how T1 lines work can actually help |
| data traffic transmission at a speed rate of 1.544 | | | | you in deciding whether your company is going to |
| Mbps which is equivalent to 1,544,000 bits per | | | | avail of these lines or not. And while you are still |
| second. The reliability and dependability of having a | | | | contemplating on whether you are going to get that |
| T1 line is way greater in comparison to that of a | | | | T1 line from your provider, here are some of the |
| standard telephone line or DSL. Telecommunication | | | | most incredible things as well as features that you |
| companies tend to give higher service level | | | | can simply anticipate and expect for all those T1 and |
| agreements or SLA to T1 lines unlike the common | | | | internet business enthusiasts. Now, aside from getting |
| DSL or telephone line. Almost all T1s come with SLAs | | | | the advantage of having a program which is faster |
| that will give the customers an assurance and | | | | and speedier, it can also transmit and send voice and |
| security when it comes to things such as speed, | | | | data with a rate of as much as 1.544 Mbps. But |
| uptime as well as latency or the time that it takes | | | | these facts are already served in a golden platter. |
| for the signal to travel from one point to another. | | | | Lets hold our breathes together as I unfold to you |
| Digital pipelines or carriers are also available in many | | | | some of the latest developments from your favorite |
| different sizes which have the capacity of supplying | | | | internet connection. |
| any data delivery equipment virtually. | | | | Combined T1 Telephone and Internet Service: this |
| Here are the types of T1 lines that you can choose | | | | development just means that an Integrated T1 line |
| from: | | | | will be sharing bandwidth between digital phone lines |
| VOICE T1: it has the ability of handling up to 24 calls | | | | and broadband internet service. Normally, there will be |
| concurrently, even more when the device has a | | | | up to 12 phone lines that can be accommodated. For |
| voice compression. This means that it compresses | | | | instance, if a T1 line that is set up is a dynamic or an |
| the standard 64 Kbps bandwidth for every call to as | | | | active one, then any bandwidth that is not used for |
| low as 8 Kbps. There are also no limits into how | | | | telephone calls can be automatically available for |
| many telephone numbers that can point to a T1 | | | | Internet access. |
| which permits some other companies to have | | | | Digital Signage Bandwidth Options: another |
| hundreds of numbers pointing a single T1, which are | | | | development in which it concerns on the digital signs |
| referred to as Direct Inward Dialing or DID numbers. | | | | like those large billboards that can be easily and |
| CHANNELIZED T1: it is a T1 line that is being split up | | | | instantly updated thru the use of data download. T1 |
| into 24 equally divided channels. Each and every | | | | and Fractional T1 lines or VSAT digital satellite |
| channel that is referred to a DSO or Digital Signal, | | | | connections are available even on rural areas. |
| level zero that can transmit 64 Kbps. This type of line | | | | Pseudowires: this is actually some kind of a virtual |
| can be directly plugged into a PBX for a phone | | | | "circuit" that can imitate a traditional or conventional |
| service usage. These T1s also have no features since | | | | digital telecom service. However, only on a packet |
| all its special features are being provided by the PBX | | | | switched network is suitable with MPLS networks. |
| itself. | | | | With the use of pseudowire circuits, your company |
| ISDN PRI: ISDN PRI stands for Integrated Service | | | | can avail of the point to point connectivity that you |
| Digital Network - Primary Rate Interface which is | | | | like and want without having to re-engineer your |
| another type of T1. The main difference between a | | | | facilities just to fit a different protocol network. |
| normal T1 and a PRI is that PRIs use one of the 24 | | | | WISP or the Wireless Internet Service Provider: this |
| channels that are available into a T1 as the data | | | | feature, on the other hand, makes its way to |
| channel. This channel can handle the customer call | | | | connect the Internet to tower radios and bonded |
| information as well as control signals instead of the | | | | T1s are the ones that are being used mostly for this |
| actual call. The features of an ISDN PRI would include | | | | purpose. |
| Caller ID and screen pops, customer information and | | | | A digital telephone trunking: T-carriers such as T1 |
| history that pop up on the computer screen when | | | | offer that can carry multiple phone calls on one |
| there is an incoming call being answered. | | | | physical circuit. |
| Other types of T1 that you can also choose from | | | | Knowing and seeing the developments mentioned |
| are the DATA T1, PRIVATE LINE, FRACTIONAL T1, | | | | above, it would not be a surprise anymore that the |
| INTEGRATED T1, DYNAMIC T1 and BONDED T1. | | | | usage of T1 as the main internet connection will not |
| How does a T1 line work? | | | | just be confined into World Wide Web usage. As the |
| Lo and behold the latest technology that an internet | | | | time progresses, more and more things could possibly |
| service provider has to offer, that is T1. T1 lines are | | | | happen by just merely using the T1internet line as |
| those copper or fiber optic lines that have the | | | | your company's main service connection. |
| capacity of carrying data than the traditional phone | | | | |