1. 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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2. 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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3. 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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4. CPE
The following are the objectives that we have set as a organization.
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5. Customer Premises Installation
Splitter
ADSL
RJ 11
RJ 45
Line
Single User with
Voice and Data
Splitter
ADSL
STB
RJ 11
RJ 45
AV Port
Single User with
Voice, Data and Video
Line
Splitter
ADSL
Switch
Multi user Business
Customer
Line
RJ 11
RJ 45
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6. How to connect Multiple Telephones
(1)
Phone Socket
(2)&(3)
Phone
(4) ,(6) & (7)
RJ-11 Tel cable
(5)
Splitter
(8)
Phone Jack
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7. Functions of A POTS Splitter
highpass
DSL
LINE
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
lowpass
filter
TELE
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8. 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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9. IP Address is allocated
CPE Installation
BRAS
CPE
PPPoE Session
T2 Switch
T1 Switch
Bridge Mode
DSLAM
IP Address is allocated
to PC By BRAS
Router Mode
IP Address is
allocated to CPE
By BRAS
BRAS
DSLAM
CPE
NAT
T2 Switch
IP Address is
allocated
to PC By CPE
T1 Switch
PPPoE Session
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10. IP Address is allocated
Multi User Customer
Router Mode
NAT
BRAS
DSLAM
CPE
T2 Switch
T1 Switch
PPPoE Session
Switch
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.
Multi User Customer
IP Address is allocated
to PCs By CPE
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11. DSLAM
The following are the objectives that we have set as a organization.
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12. 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 ADSL line.
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13. 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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14. 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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15. 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
- 32 & 16 Ports Deployed in Other Cities
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16. Rear view of the M 5105
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17. Subtending connection of the MA5105 FE (100BASE-TX) ports
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18. Tier 1 and Tier 2 LAN switches
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19. 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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20. 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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21. Distance Limitations Tier I to Tier II Tier I / II LAN Switch to DSLAM
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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22. 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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23. BRAS (Broad band Remote Access Server)
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24. 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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25. SSSS (Subscriber Service Selection System.)
Selection of various range of service.
This provides on demand service without manual intervention
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26. RADIUS
This in conjunction with BRAS
AAA function
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27. 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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28. 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 concurrent sessions (A1 sites)
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29. 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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30. END
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