The T1 Line Connection, PRI, DS0 Channels and IP Service
T1 Line Bandwidth and Voice Connectivity
When it comes to getting reliable bandwidth, many enterprises prefer to go with T1 line over other solutions offered by the service providers. There are many benefits of using this option. The T1 link is dedicated and can be used to connect each branch with proper links. Besides with channelization and bonding wide range of link rates can be configured.
The T1 link is a dedicated bandwidth of 1.544 Mbps that can be transported over any network as a whole. This link is delivered to enterprises over a four wire link. The enterprise can then connect it to a wide range of customer equipment for various services.
There are many applications of the T1 link. One of the most common ones is the Primary Rate Interface or the PRI. PRI is an ISDN technology that allows as many as 23 voice circuits to be connected to the switch. Of course 23 is just the number of concurrent links; with a PRI switch many more numbers can be services over the PRI. Typically, these numbers are entered as DIDs.
T1s are also very popular WAN links. In many enterprises the WAN services are implemented using a dedicated link from their customer end equipment to central office router. This link is established over a T1 line. Of course, not all requirements are for full T1 speeds. Channelized T1 links allow for lower rates with the scope to upgrade to higher rates later.
Some special applications require lower Bandwidth. Credit card machines and online lottery machines do not transfer a lot of data so even a 64 kbps connection is sufficient. In such cases, the T1 is not a service line but an aggregator. So with a single T1 up to 24 customers can be services from the aggregation point.
While T1 rate cannot go over 1.5 Mbps, with innovative solutions like bonded T1 we can attain higher rates. If 2 T1s are bonded we can get an effective bandwidth of 3 Mbps. Using this logic rates as high as 9 Mbps with 6 T1 lines is possible. Beyond this, typically fibre installation are more economical and hence T1s are not preferred. However in some rare cases, copper can be used for rates beyond 9 Mbps too.
So it is evident that T1 lines are very flexible and can extend themselves to all kinds of connectivity requirements. With channelization lower data rates can be easily supported and T1 links can become the aggregator paths for slower traffic. The bonding of these links increases the bandwidth.
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