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 11/11/2018

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) 11/11/2018

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 11/11/2018

CPE The following are the objectives that we have set as a organization. 11/11/2018

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 11/11/2018

How to connect Multiple Telephones (1) Phone Socket (2)&(3) Phone (4) ,(6) & (7) RJ-11 Tel cable (5) Splitter (8) Phone Jack 11/11/2018

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 11/11/2018

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. 11/11/2018

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 11/11/2018

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 11/11/2018

DSLAM The following are the objectives that we have set as a organization. 11/11/2018

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. 11/11/2018

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 11/11/2018

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 11/11/2018

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 11/11/2018

Rear view of the M 5105 11/11/2018

Subtending connection of the MA5105 FE (100BASE-TX) ports 11/11/2018

Tier 1 and Tier 2 LAN switches 11/11/2018

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 11/11/2018

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 11/11/2018

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 11/11/2018

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. 11/11/2018

BRAS (Broad band Remote Access Server) 11/11/2018

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 11/11/2018

SSSS (Subscriber Service Selection System.) Selection of various range of service. This provides on demand service without manual intervention www.dataone.in 11/11/2018

RADIUS This in conjunction with BRAS AAA function 11/11/2018

LDAP (Light Weight Directory Access Protocol Server) It stores customer database viz username, password and the default services that it can subscribe to. 11/11/2018

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) 11/11/2018

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 11/11/2018

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