Transcript Document

Broadband Components
• Customer Premises Equipment(CPE)
• Digital Subscriber Line Access
Multiplexer (DSLAM)
• LAN Switches: for aggregating DSLAM
• Broadband Remote Access Server
(BRAS)
• RADIUS and LDAP (SSSC)
• Provisioning System
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Requirement at Customer End
• BSNL’s BFone
• Computer of minimum configuration, with
10/100 Mbps Ethernet Card
• DSL Modem + Splitter
• PPPoE software to be loaded in the Client
• Broadband Account (Username and Password)
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Brief Functions of DSL Components
• DSL CPEs: At customer premises. On one end it connects
telephone cable coming from exchange via splitter. At the other
end, it connects to PC through Ethernet / USB Port.
• DSLAM: called as DSL Access Multiplexer. It has a built in
splitter which splits voice and data. While voice follows the normal
conventional path through exchange, data is aggregated and up
linked through Ethernet Port (Gigabit Ethernet for 480 port and
Fast Ethernet for lower DSLAM)
• LAN Switch: For aggregating multiple DSLAM and providing a
common uplink to the core
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CPE
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Customer Premises Installation
Line
RJ 11
Splitter
RJ 11
RJ 11
Line
ADSL
RJ 11
RJ 11
RJ 11
RJ 11
RJ 45
Single User with
Voice, Data and Video
Single User with
Voice and Data
Line
RJ 11
Splitter
RJ 11
Splitter
RJ 11
RJ 11
ADSL
RJ 45
RJ 45
RJ 45
STB
AV Port
ADSL
RJ 45
Switch
Multi user Business
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How to connect Multiple Telephones
(1)
Phone Socket
(2)&(3) Phone
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(4) ,(6)
& (7)
RJ-11 Tel cable
(5)
Splitter
(8)
Phone Jack
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Functions of A POTS Splitter
DSL

highpass
filter
Splitter

Separates the 300 Hz to 3500 Hz voice
channel from upstream and
downstream channels

Reduces traffic congestion

Pass voice, dial tone, ringing and on/off
hook signals

Consists of a lowpass filter (LPF) for
POTS and a highpass filter (HPF) for
upstream/downstream channels

Passive device

Contains lighting protection circuitry
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LINE
lowpass
filter
TELE
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CPE Installation
• CPE(ADSL MODEM) can be utilized in two
different ways
– 1. Transparent Bridge – In this mode we need to
configure PPPoE in the customer’s PC and modem
simply passes ethernet frames from one side to other
side in transparent fashion. Customer’s PC
authenticates itself with BRAS
– 2. Router Mode- In this mode PPPoE is configured in
modem. Modem authenticates itself to BRAS and gets
IP address. Modem provides different address from its
DHCP server to PC. Modem also performs the NAT
function in this mode.
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CPE Installation
Bridge Mode
IP Address is allocated
to PC By BRAS
CPE
DSLAM
T2 Switch
T1 Switch
BRAS
PPPoE Session
Router Mode
IP Address is
allocated to CPE
By BRAS
CPE
NAT
IP Address is
allocated
to PC By CPE
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DSLAM
T2 Switch
T1 Switch
BRAS
PPPoE Session
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Multi User Customer
Router Mode
NAT
CPE
DSLAM
T2 Switch
Switch
Multi User Customer
IP Address is allocated
to PCs By CPE
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T1 Switch
BRAS
PPPoE Session
In this mode PPPoE is configured on CPE and only
One session is established between CPE and BRAS.
CPE gets IP Address from BRAS. DHCP in CPE
Allocates IP addresses to machines. In this case all
The machines share the bandwidth allowed for that
Account. CPE has to do NAT also.
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DSLAM
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DSLAM: Functions
•Houses a set of ATU-C interfaces.
•Multiplex traffic from multiple ATU-Cs on to a
single, high speed link to the transport
network.
•Demultiplex traffic from the transport network
and assigns it to the correct ATU-C
•Negotiate line speed.
•Splits the voice and data coming through
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ADSL
line.
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DSLAM
 DSLAM is an integrated hardware and
software system that allows the user to
access Broadband services as well as
originate and terminate telephone calls
over the same single pair of copper wires
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DSLAM
 DSLAM aggregates the subscriber lines
 DSLAM separates Voice and Data of the Subscriber
 Voice is given to the exchange switch
 Data is fed to the IP Network through the LAN Switch
 DSLAMs have been categorized in to 6 types based on no.
of ports (480, 240,120, 64, 32 & 16) provided and planned
for deployment based on the expected demand
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DSLAM
Two types of DSLAMs have been proposed to address BSNL
requirement.
 SMARTAX MA5300 IP DSLAM
–Large Capacity (480,240,120 Ports)
- Deployed in A1, A2, A3, A4, B1, B2 Cities
 SMARTAX MA5105 IP DSLAM
–Small Capacity (64,32,16 Ports)
- 64 Ports deployed in A1, A2, A3, A4, B1, B2 Cities
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32 & 16 Ports Deployed in Other Cities
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Rear view of the M 5105
SLOT0
SLOT1
Uplink board
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SLOT2
Service board
Service board
DC -48V
©G
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Uplink
Supreme
MA5105
Service board
Service board
MFCE/MFCS/MFCM
Level 1
MA5105
Service board
Service board
MFCE
Level 2
MA5105
Level 3
MA5105
MFCE
MFCE/MIFE
Service board
Service board
Service board
Service board
Subtending connection of the MA5105 FE (100BASE-TX) ports
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Tier 1 and Tier 2 LAN switches
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LAN SWITCH
 LAN Switches provide Gigabit Ethernet ( GE )
interfaces and Fast Ethernet ( FE ) interfaces for
connecting internetworking elements such as BRAS,
DSLAMS etc.,
 Tier 1 switches are Gigabit Ethernet Aggregation
switches to which B-RAS and Tier 2 LAN switches are
connected through GE / FE interfaces
 All DSLAMs are aggregated to Tier 2 switches
through FE interfaces except 480 ports DSLAMs are
aggregated through GE interfaces
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Interfaces
•
•
•
•
•
Gigabit Ethernet – optical
Fast Ethernet – Optical
Fast Ethernet – Electrical
Ethernet – Optical
Ethernet – Electrical
• Optical Interface Types
– LX – 40 Km range – Available for Tier I to Tier II
– SX – 10 Km range – Available for Tier II to DSLAM
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Distance Limitations
• Tier I to Tier II
– Dark Fiber – 40 Km
– SDH Transport – Any distance
• Tier I / II LAN Switch to DSLAM
– Dark Fiber – 10 Km
– SDH Transport – Any Distance
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Functions of TIER I and TIER II switches.
• It act as an interface between DSLAM and
BRAS.
• Management of statistical data.
• Fast forwarding and control of data
packets.
• Capable of unblocked switching.
• Monitoring and fault diagnosis.
• Managing and calculating the route.
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BRAS (Broad band Remote Access Server)
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Functions of BRAS
•
•
•
•
Supports termination of DSL customers.
Allottment of IP address to customer
Bandwidth control using rate limiting
Act as an edge router for terminating VPN
traffic.
• Protocols: OSPF, BGP, MP-BGP and LDP
• Supports Lawful interception and monitoring
• AAA function
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SSSS (Subscriber Service Selection
System.)

Selection of various range of service.

This provides on demand service without
manual intervention

www.dataone.in
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RADIUS

This in conjunction with BRAS

AAA function
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LDAP (Light Weight Directory
Access Protocol Server)

It stores customer database viz username,
password and the default services that it can
subscribe to.
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BRAS Architecture
• Deployed at the edge of the NIB-II
network
• Installed in all the A sites (except
Mumbai). Total 23
• Capacity of 8 Gbps (in A1 sites) and 4
Gbps (in other A sites)
• Can handle 480000 concurrent sessions
(A1 sites)
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Brief Functions of DSL
Components…contd.
Provisioning: This is the most critical components
for ensuring quick delivery of service. It ensures
end-to-end provisioning of service right from DSL
CPEs to DSLAM to Switch to BRAS to LDAP

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END
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