leased line (mlln)
TRANSCRIPT
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Leased Line Data Circuits
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Leased Lines
Dedicated pair of copper wires for 24 hour data
service provision to customers.
It is a physical path owned by the user or rented outby the provider.
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Types
Conventional leased line
Managed leased line network (MLLN)
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Conventional Leased Line
This technology marked the beginning of the use of
leased line technology for data transmission.
Conventional leased lines are very rarely used now.
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Managed Leased Line Network
BSNL uses Tellabs 8100 system in providing MLLN. This system is describedas follows.
The MLLN is a Managed Leased Line Network system, which can provideleased line connectivity.
MLLN is capable of supporting two type of leased line.
1. Point to Point Circuit
2. Point to Multi Point Circuit
Bandwidth of a Managed Leased Line can be 64Kbps to n x 64 Kbpswhere n = 1,2,3,32.
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MLLN applications
Corporate hi--speed Internet Access through NIB
Point to Multipoint Connection for data circuit
Point to Point Connection for data circuit
Hotline connectivity for voice
LAN-Inter Connection
EPABX Inter--connection
Virtual Private Network on MLLN Network
Extension of VPN (MPLS) to customer through MLLN
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STRUCTURE OF MLLNThe MLLN is planned as threetier structure
A Central Node provide following functions:
NMS Centre.
Connectivity to second stage Nodes.
Second stage Node : It is located at major cities of a
Telecom Circle, where demand for leased line is high.
Third Stage Node : It is located at smaller cities/ towns of a
Telecom circle where demand for leased line is lower.
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MLLN NODES
A Node can be described as a digital Multiplexerequipped with several trunk interfaces & as a
digital cross connect device equipped with
several channel interfaces.
DXC (Digital cross connect)
VMUX (Versatile Multiplexer)
NTU (Network Terminating Unit) NMS (Network Management system)
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MLLN STRUCTURE
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Network Termination Unit (NTU)
As the name suggests, NTUs are basically termination units for
the MLLN system. It is the equipment which is located within
the user premises.
A copper twin connects the NTUs to the respective VMUX (the
OMH card of the VMUX).
BSNL provides subscribers with a number of NTU versions, butthe two most prominent ones are Tellabs 8110 CTU-S and
Tellabs 8110 CTU-R.
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VMUX(8150 node)
Tellabs 8150 basic node is the basic building blockof the Tellabs 8100 system.
VMUX is a small capacity cross connect device & is
installed at different sites for providing user
connectivity.
It is used in local exchange or backbone networks
or customer premises networks, depending on the
needed services & applications.
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Tellabs 8150
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VMUX Card Description
OMH (Octet Module Housing): The copper twin from thesubscribers reaches the MDF (Main Distribution Frame) and
then from that the line is terminated at the OMH card. The
number of OMH cards depends on the user density. Each card
consists of four ports each port terminating two subscriberlines.
QMH (Quadrat Module Housing) and XCG (Cross Connect
Group): The OMH is connected to the QMH and the XCG from
which the multiplexed-demultiplexed output is sent to the
slave rack of a DXC. The QMH and XCG cards have four ports,
each port housing one E1 links.
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Digital Cross Connect (DXC)
DXCs at Metros are designated as Regional DXCs (R-DXC).
DXCs at different maintenance regions apart from metros are
called Sub-regional DXCs (SR- DXC)
DXCs in the SSAs (Secondary Switching Area) level are called
SS-DXC.
A DXC (Digital X-Connection) is equipped with several trunk
(E1) interfaces coming from other DXCs or VMUXs.
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RDXC DELHIRDXC
KOLKATA
RDXC
MUMBAIRDXC
CHENNAI
SRDXC
SSADXC
E1
E1
VMUXSRDXC
SSADXC
VMUXNTU
NTU
A Office at Mumbai is having a leased line connection with another branch office atKolkata
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Thank You