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Broadband
1. 10/27/15 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
2. 10/27/15 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)
3. 10/27/15 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
5. 10/27/15 5
Customer Premises Installation
Splitter ADSL
RJ 11 RJ 11
RJ 11
RJ 11
RJ 45
Line
Single User with
Voice and Data
Splitter ADSL
STB
RJ 11 RJ 11
RJ 11 RJ 45 RJ 45
RJ 45
AV Port
Single User with
Voice, Data and Video
Line RJ 11
Splitter ADSL
Switch
Multi user Business
Customer
Line
RJ 11 RJ 11
RJ 11
RJ 45
6. 10/27/15 6
How to connect Multiple Telephones
(1) Phone Socket
(2)&(3) Phone
(4) ,(6)
& (7)
RJ-11 Tel cable
(5) Splitter
(8) Phone Jack
7. 10/27/15 7
highpass
filter
LINEDSL
lowpass
filter
TELE
Functions of A POTS Splitter
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
8. 10/27/15 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.
9. 10/27/15 9
CPE Installation
BRAS
CPE
PPPoE Session
T2 Switch
T1 Switch
BRAS
CPE
PPPoE Session
T2 Switch
T1 Switch
Bridge Mode
DSLA
M
IP Address is allocated
to PC By BRAS
Router ModeIP Address is
allocated to CPE
By BRAS
IP Address is
allocated
to PC By CPE
NAT
DSLA
M
10. 10/27/15 11
Multi User Customer
BRAS
CPE
T2 Switch
T1 Switch
Router Mode
DSLA
M
IP Address is allocated
to PCs By CPE
Multi User Customer
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.
Switch
PPPoE Session
NAT
12. 10/27/15 13
•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.
DSLAM: Functions
13. 10/27/15 14
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
14. 10/27/15 15
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
15. 10/27/15 16
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
17. 10/27/15 18
MFCE/MFCS/MFCM
Uplink
Level 3
MA5105
Level 1
MA5105
Level 2
MA5105
Supreme
MA5105
Service board
Service board
MFCE
Service board
Service board
MFCE
Service board
Service board
MFCE/MIFE
Service board
Service board
Subtending connection of the MA5105 FE (100BASE-TX) ports
19. 10/27/15 20
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
20. 10/27/15 21
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
21. 10/27/15 22
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
22. 10/27/15 23
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.
24. 10/27/15 25
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
25. 10/27/15 26
SSSS (Subscriber Service Selection
System.)
Selection of various range of service.
This provides on demand service without
manual intervention
www.dataone.in
27. 10/27/15 28
LDAP (Light Weight Directory
Access Protocol Server)
It stores customer database viz username,
password and the default services that it can
subscribe to.
28. 10/27/15 29
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)
29. 10/27/15 30
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
