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RPR Technology

• Spatial reuse: Bandwidth is consumed only between source and destination nodes, leaving it available for downstream nodes.
• Scalable: Supports topologies with over 100 nodes per ring.
• Automatic topology discovery mechanism.

RPR Operation

• Dual counter rotating fiber ring topology: Both rings (inner and outer) are used to transport working traffic between nodes.
• Total available ring bandwidth is utilized, instead of keeping one spare fiber for protection.
• Control messages for topology updates, protection, and bandwidth control are carried on the ring.
• Control messages flow in the opposite direction of the traffic they represent.

Resource Allocation and Control

• No master node on the ring: Bandwidth management and congestion control are fully distributed over all nodes.
• Nodes implement control algorithms collectively to manage bandwidth and congestion.
• Each node processes three traffic streams: exit, ingress, and transit traffic.

Receive Decision

• Every station has a 48-bit MAC address.
• Nodes receive packets with a matching MAC destination address.
• Multicast packets are copied to the host and continue through the transit path, while unicast packets are stripped from the ring and do not consume bandwidth.

Transit Path

• Nodes with non-matching destination addresses allow packets to continue circulating around the ring.
• RPR packets undergo minimal processing per hop on a ring.

Transmit and Bandwidth Control

• RPR MAC can transmit both high and low-priority packets.
• Bandwidth algorithm controls bandwidth allotment for low-priority packets.

MNG-PAN Switches

• Collect customer traffic from various access broadband networks (e.g., DSL, FTTH, MSAN, 3G Node B, Wi-Max).
• Hand over traffic to IP-MPLS core network.
• Centrally managed from the EMS deployed at NOC/DR-NoC.
• Transparently handle IPV6 traffic.
• 99.999% reliability.

Aggregation Network

• Deployed in MPLS-based network prior to PAN switches.
• Consists of multi-gigabit, multi-protocol label switching (MPLS) based IP network.
• Supports QoS features with four different classes of traffic (Platinum, Gold, Silver, and Bronze).
• Features MPLS-Traffic Engineering, Fast Reroute, and multi-casting.

Features of MNG-PAN Network

• Based on Pseudo Wire over MPLS-TP technology for efficient Ethernet aggregation.
• Offers wide range of protocols, standards, and interfaces.
• Carrier-class set of features, including carrier-class sub 50ms recovery resiliency.
• Hard QoS/SLA guarantees.
• End-to-end and multi-layer OAM.
• Network-wide time/clock synchronization.
• Efficient multicast data distribution.
• Range of interfaces up to 10GE.
• Low power consumption.
• Centralized management.

Advantages of MNG-PAN Transport Network

• Scalability: Supports electrical and optical Ethernet interfaces from FE to 10GE.
• Reliability: Carrier-class reliability with fully redundant hardware architecture.
• Resilience: Various protection schemes and sub-50ms failure recovery.
• Manageability: Enhanced OAM capability with end-to-end service management.
• Inter-operability: Compliant with ITU-T MPLS-TP standard.
• Bandwidth Efficiency: Packet nature enables better utilization at the aggregation level.
• Lower TCO: Low power consumption, bandwidth efficiency, fast fault isolation, and simple management.

Conclusion

• RPR can meet the requirements of service providers building scalable, feature-rich networks.
• RPR provides carrier-class reliability and scalability.
• MNG-PAN and OC-PAN switches collect customer traffic and hand it over to the IP-MPLS core network.

RPR Benefits

• RPR is efficient
• One RPR multicast packet can be transmitted around the ring and received by multiple nodes
• RPR allows bandwidth to be used on multiple idle spans (spatial reuse)
• RPR protects failed spans within 50ms
• High-priority packets are delivered with minimal jitter and latency
• RPR rings can support about 100 nodes and throughputs range from 80 to 320 Gbps, typically scaling in 1-Mbit/s increments to 1 Gbit/s

MNG-PAN and OC-PAN

• MNG-PAN is an MPLS-based next-generation packet aggregation network for efficient multi-service aggregation of voice, video, and data traffic
• MNG-PAN switches collect customer traffic from various access broadband networks and hand it over to the IP-MPLS core network
• MNG-PAN switches are centrally managed from the EMS deployed at NOC/DR-NoC
• MNG-PAN switches transparently handle IPV6 traffic and have 99.999% reliability

Aggregation Network Deployed in MPLS-Based Network Prior to PAN Switches

• The network consists of a 2-layered centrally managed IP backbone network designed to provide convergent network supporting data, voice, and video applications
• The network supports QoS features with four different classes of traffic (Platinum, Gold, Silver, and Bronze) along with MPLS-Traffic Engineering, Fast Reroute, and multi-casting
• BSNL has deployed a RPR technology-based aggregation network in 98 cities for aggregating Metro IP Traffic
• Around 1200 RPR-based switches are deployed as Metro Aggregation
• Around 3000 LAN switches are deployed in the network for OC City Aggregation (OCLAN)

Deployment Architecture of MNG-PAN and OC-PAN

• BSNL deployed MNG-PAN Aggregation Network in 15 cities
• 421 PAN-COAU & PAN switches and 287 OC PAN switches are deployed
• The OC-PAN ring aggregates traffic from all nodes and hands it over to the upper MNG-PAN ring
• The Central Office Aggregation Unit (COAU) switch of the PAN ring aggregates traffic from all PAN nodes and hands it over to the IP-MPLS core

Features of MNG-PAN Network

• Pseudo Wire over MPLS-TP technology that supports efficient Ethernet aggregation
• Wide range of protocols, standards, and interfaces coupled with highest reliability
• Carrier-class set of features, including carrier-class sub-50ms recovery resiliency
• Hard QoS/SLA guarantees
• End-to-end and multi-layer OAM, network-wide time/clock synchronization
• Efficient multicast data distribution and range of interfaces up to 10GE
• Low power consumption and centralized management

Advantages of MNG-PAN Transport Network

• Scalability: Support of electrical and optical Ethernet interfaces from FE to 10GE and large switching capacity
• Reliability: Carrier-class reliability with fully redundant hardware architecture
• Resilience: Various protection schemes and sub-50ms failure recovery
• Manageability: Enhanced OAM capability with end-to-end service management and NMS-based operation
• Inter-operability: Compliant with ITU-T MPLS-TP standard and easy integration with core IP/MPLS or OTN networks
• Bandwidth Efficiency: Packet nature of the network with flexible data-pipes enables users to request services in smaller increments and provides better utilization at the aggregation level
• Lower TCO: Low power consumption, bandwidth efficiency due to optimized packet aggregation, fast fault isolation, and simple management, and smaller form factor

RPR Technology

• Spatial reuse: bandwidth is consumed only between source and destination nodes, and packets are removed at their destination, leaving bandwidth available for downstream nodes.
• Scalable: supports topologies of more than 100 nodes per ring.
• Automatic topology discovery mechanism.

RPR Operation

• Dual counter rotating fiber ring topology: both rings (inner and outer) are used to transport working traffic between nodes.
• Total available ring bandwidth is utilized, rather than keeping one spare fiber for protection.
• Control messages for topology updates, protection, and bandwidth control flow in the opposite direction of the traffic they represent.
• RPR nodes can dynamically negotiate for bandwidth with other nodes on the ring.
• Capability to differentiate between low and high-priority traffic, transmitting high-priority packets before low-priority ones.
• RPR nodes have a transit path and a transit buffer, allowing for higher-priority packet transmission while holding lower-priority packets.

RPR Benefits

• Efficiency: RPR is efficient in bandwidth usage.
• Multicast: one RPR multicast packet can be transmitted around the ring and received by multiple nodes.
• Spatial reuse: RPR uni-cast packets are stripped at their destination, allowing for bandwidth reuse on multiple idle spans.
• Resiliency: topology discovery and protection mechanisms ensure rapid recovery (within 50ms) from failed spans.
• Performance: high-priority service delivery with minimal jitter and latency.
• Scalability: system throughputs range from 80 to 320 Gbps, with typical scaling in 1-Mbit/s increments to 1 Gbit/s.

MNG-PAN and OC-PAN

• MNG-PAN is an MPLS-based Next Generation Packet Aggregation Network.
• It incorporates MPLS-TP (MPLS-Transport Profile) technology for transport networks.
• MNG-PAN is designed for efficient multi-service aggregation of voice, video, and data traffic from various access technologies.
• It offers high-performance aggregation, network-wide time/clock synchronization, carrier-class sub-50ms recovery resiliency, guaranteed QoS and SLA enforcement, and end-to-end multi-layer OAM.

Deployment Architecture

• BSNL deployed MNG-PAN Aggregation Network in 15 cities.
• Deployment of MNG-PAN switches in the network involves:
  • PAN-COAU (Packet Aggregation Network – Central Office Aggregation Unit) switches for connecting to BNG or MPLS routers.
  • OC-PAN (Other City Packet Aggregation Network) switches for aggregating traffic from all nodes and handing it over to the upper MNG-PAN ring.

Features of MNG-PAN Network

• Based on Pseudo Wire over MPLS-TP technology, supporting efficient Ethernet aggregation.
• Offers a wide range of protocols, standards, and interfaces, coupled with high reliability.
• Carrier-class features, including sub-50ms recovery resiliency, hard QoS/SLA guarantees, and end-to-end multi-layer OAM.
• Efficient multicast data distribution and range of interfaces up to 10GE.
• Low power consumption and centralized management.

Advantages of MNG-PAN Transport Network

• Scalability: supports electrical and optical Ethernet interfaces from FE to 10GE, with large switching capacity.
• Reliability: carrier-class reliability with fully redundant hardware architecture.
• Resilience: various protection schemes, sub-50ms failure recovery, and enhanced OAM capability.
• Manageability: NMS-based operation, easy integration with core IP/MPLS or OTN networks.
• Inter-operability: compliant with ITU-T MPLS-TP standard.
• Bandwidth Efficiency: packet nature of the network enables better utilization at the aggregation level.
• Lower TCO: low power consumption, bandwidth efficiency, fast fault isolation, and simple management.

Spatial Reuse and Efficiency

• Unlike SDH, bandwidth is consumed only between the source and destination nodes in RPR.
• Packets are removed at their destination, leaving bandwidth available to downstream nodes on the ring.

RPR Operation

• RPR technology uses a dual counter-rotating fiber ring topology.
• Both rings (inner and outer) are used to transport working traffic between nodes.
• RPR utilizes the total available ring bandwidth by using both fibers instead of keeping one spare fiber for protection.
• The fibers or ringlets are also used to carry control messages for topology updates, protection, and bandwidth control.
• Control messages flow in the opposite direction of the traffic they represent.
• RPR nodes can dynamically negotiate for bandwidth with other nodes on the ring using bandwidth-control messages.
• RPR can differentiate between low and high-priority traffic and transmit high-priority packets before those of low priority.
• RPR nodes have a transit path through which packets destined to downstream nodes on the ring flow.

Topology Discovery

• RPR has a topology discovery mechanism that allows nodes on the ring to be inserted or removed without manual management intervention.
• Nodes circulate a topology discovery message to learn the MAC addresses of other stations.
• Each node that receives a topology message appends its MAC address and passes it to its neighbor.
• The topology map is used to determine the best path to the destination.

Protection

• RPR has the ability to protect the network from single span (node or fiber) failures.
• When a failure occurs, protection messages are quickly dispatched.
• RPR has two protection mechanisms: wrapping and steering.
• Wrapping: nodes adjacent to the failed span move packets away from the failure by wrapping traffic around to the other fiber (ringlet).
• Steering: notifies all nodes on the ring of the failed span.

MNG-PAN Switches

• Collect customer traffic like voice, video, and data from various access broadband networks.
• Hand over the traffic to the IP-MPLS core network.
• Centrally managed from the EMS deployed at NOC/DR-NoC.
• Transparently handle IPv6 traffic.
• Have 99.999% reliability.

Aggregation Network

• Consists of a multi-gigabit, multi-protocol label switching (MPLS) based IP network.
• Designed to provide a convergent network supporting data, voice, and video applications.
• Supports QoS features with four different classes of traffic: Platinum, Gold, Silver, and Bronze.
• Includes MPLS-Traffic Engineering, Fast Reroute, and multi-casting.

Features of MNG-PAN Network

• Based on Pseudo Wire over MPLS-TP technology.
• Offers wide range of protocols, standards, and interfaces.
• Carrier-class set of features, including sub-50ms recovery resiliency.
• Hard QoS/SLA guarantees.
• End-to-end and multi-layer OAM.
• Network-wide time/clock synchronization.
• Efficient multicast data distribution.
• Range of interfaces up to 10GE.
• Low power consumption.
• Centralized management.

Advantages of MNG-PAN Transport Network

• Scalability: supports electrical and optical Ethernet interfaces from FE to 10GE.
• Reliability: carrier-class reliability with fully redundant hardware architecture.
• Resilience: various protection schemes and sub-50ms failure recovery.
• Manageability: enhanced OAM capability with end-to-end service management.
• Inter-operability: compliant with ITU-T MPLS-TP standard.
• Bandwidth efficiency: packet nature of the network with flexible data-pipes.
• Lower TCO: low power consumption, bandwidth efficiency, and fast fault isolation.