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NET STAR INTERNET
DEFINITION
OF CIRCUIT TYPES Quick Quote >>
MPLS -
"Multi-Protocol Label
Switching", is a data packet forwarding technology with improved forwarding
speed of routers by using labels to make data forwarding decisions. When the
data enters the first MPLS router, header analysis is done just once and a
label is attached to the data packet. Subsequent routers forwards the packet
by just inspecting the label and so it decreases the forwarding overhead on
the subsequent core routers. IP packets have a field in their header that
contains the address to which the packet is to be routed. Traditional routed
networks process this information at every router in a packet's path through
the network. This is not so in MPLS, where a label acts as a shorthand
representation of an IP packet's header and carries the information that
determines which path a packet should take. Nodes in the core MPLS network
need not examine the packets header to perform next routing tasks.
In MPLS terminology, the packet handling nodes or routers are called Label
Switched Routers (LSRs) and are classified into two broad categories At the
edge of the network high performance packet classifiers that can apply (and
remove) the requisite labels are known as Edge Routers or Label Edge Routers
(LER). Routers that perform routing based only on Label Switching are called
Label Switch Routers (LSR). MPLS technology helps to provide traffic
prioritization and quality of service. It can be used to carry many
different kinds of traffic, including IP packets, ATM, SONET, and Ethernet.
The Paths can also be engineered.
DEFINITION OF PRI
Quick Quote >>
(Primary Rate Interface) An ISDN service that provides
23 64 Kbps B (Bearer) channels and one 64 Kbps D (Data)
channel (23B+D), which is equivalent to the 24 channels
of a T1 line. The advantage of the D channel is that it
sends control signals that can dynamically allocate any
number of B channels for different applications. For
example, one channel can be used for voice, while
another can be used for data, while six more can be used
for a videoconferencing channel and so on. PRI lines
typically use four wire pairs. PRI lines are often
designated as PRI/T1 or T1/PRI lines, but they are
dial-up PRI lines, not T1 lines, which are
point-to-point. See ISDN.
Short for Primary-Rate Interface, a type of ISDN service
designed for larger organizations. PRI includes 23
B-channels (30 in Europe) and one D-Channel. In
contrast, BRI (Basic-Rate Interface), which is designed
for individuals and small businesses, contains just two
B-channels and one D-channel.
POTS
Acronym for Plain Old Telephone Service.
Metro Ethernet
Quick Quote >>
computer network based on the Ethernet standard and
which covers a metropolitan area. It is commonly used as
a metropolitan access network to connect subscribers and
businesses to a Wide Area Network, such as the Internet.
Large businesses can also use Metro Ethernet to connect
branch offices to their Intranet.
Broadband Services
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