Telephone Company WAN Technologies: Leased Lines
In a leased line solution for your Wide Area Network (WAN), you purchase from the telephone company (or lease — surprise!) a permanent link while paying a monthly fee. In this case, you are not charged by the connection or the amount of data; instead, once you lease the line, you can send as much data over the link as the link will support.
The permanent link is to your service provider’s network, and it is sometimes referred to as a point-to-point link.
Leased lines tend to have more available bandwidth than circuit switch solutions. The main examples of these solutions in North America are T1 and T3 links.
T1 link: These links are made up of 24 channels that carry data at 64 Kbps, yielding a total bandwidth of 1.544 Mbps. Unlike PRI lines, they do not require a signaling channel. As mentioned, you can have up to 24 channels.
When installed, the link will have all 24 channels, but when you pay for your service, you can pay for, or use, only a portion of this link. This option lowers your monthly cost and is called a fractional-T1 link.
T3 link: These links offer additional channels. This option uses 28 T1 lines that are combined and yields a total bandwidth of 44.736 Mbps.
Cloud Computing Glossary
cloud computing
A networking solution in which everything — from computing power to computing infrastructure, applications, business processes to personal collaboration — is delivered as a service wherever and whenever you need.
Cloud Computing Glossary
cloud service
The delivery of software, infrastructure, or storage that has been packaged so it can be automated and delivered to customers in a consistent and repeatable manner.
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deprovision
The release of cloud services that are no longer needed.
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federating
Linking distributed resources together over the cloud.
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hypervisor
An operating system that acts as a traffic cop, managing the various virtualization tasks in the cloud to ensure that they make things happen in an orderly manner.
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multi-tenancy
The sharing of underlying resources by multiple companies over a cloud.
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network attached store
Storage that has its own network address through which it is accessed by the network's workstation users. Acronym: NAS
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service level agreement
A contract that stipulates the type of service you need from providers and what type of penalties would result from an unexpected business interruption. Acronym: SLA
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solution stack
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storage area network
A storage systems that is flexible and scalable because it's available to multiple hosts at the same time. Acronym: SAN
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vertical industry groups
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virtual memory
The portion of your hard drive that Windows uses to expand the available RAM
Cloud Computing Glossary
virtualization
Using computer resources to imitate other computer resources or whole computers to maximize performance and flexibility.
