1. Slide 1 Comarra Limited - 2006Slide 1 VCL-Ethernet SDH Solutions COMARRA Telecom Transmission Solutions VCL- Ethernet SDH Solutions

2. Slide 2 Comarra Limited - 2006Slide 2 VCL-Ethernet SDH Solutions Ethernet ports Features  Switching card supports the following options: 10/100 Base T 10100 Base Fx 1000 Base SX 1000 Base LX  Supports auto negotiation  Supports Flow control  Supports Jumbo frames (up to 9216 bytes)  Supports MDI-X  10/100 Base Ethernet ports can be configured in Full or Half duplex mode. 1000 Base Ethernet ports in Full Duplex mode

3. Slide 3 Comarra Limited - 2006Slide 3 VCL-Ethernet SDH Solutions Switching module : Salient Features  Line rate switching  Supports 4K VLAN per port  VLAN Stacking (Q-in-Q) is supported on all the GbE ports  Per port rate limiting at 64 kbps granularity is supported on all the client ports  Switch has a built-in packet classification and filtering engine that gives it the following capabilities Layer 2-Layer 4 packet classification and filtering Policing of flows based on programmable token bucket meters Actions (e.g. dropping, setting lower priorities) on packets that are not in conformance of programmed traffic profiles Remarking of priorities (e.g.IP v6 DSCP, 802.1p) based on filter match  Traffic shaping using 1-8 CoS queues with strict priority, weighted round-robin, weighted fair queuing in scheduling

4. Slide 4 Comarra Limited - 2006Slide 4 VCL-Ethernet SDH Solutions MAC and VLAN Switching  Ethernet switching is based on Destination MAC address + VLAN- ID  Shared L2 address table Supports up to 16K entries Entries can be configured aging or static  Shared Multicast Table with 256 entries  Allows disabling of MAC learning on a per port basis  VLAN Ids can be configured Port based Protocol based  Supports VLAN tagging and classification (IEEE 802.1 Q) VLAN stacking (Q in Q) Spanning Tree Protocol (IEEE 802.1 D) Rapid Spanning Tree Protocol (IEEE 802.1 w) MSTP (IEEE 802.1 s) Link aggregation (802.3ad)

5. Slide 5 Comarra Limited - 2006Slide 5 VCL-Ethernet SDH Solutions QoS Features  Rate of each port can be configured with granularity of 64 Kbps For FE: 64 Kbps to 10/100 Mbps For GbE: 64 Kbps to 1000 Mbps  Non conforming traffic can be dropped/back-pressured using PAUSE/RESUME thresholds.  Flow Classification based on VLAN ID IP ToS IP DSCP CoS Source/Destination MAC address EtherType Source/Destination IP Address Source/Destination L4 address Protocol field Range of VLAN

6. Slide 6 Comarra Limited - 2006Slide 6 VCL-Ethernet SDH Solutions Policing  Police simple Rate limit the flow to meet committed information rate (CIR) Burst size restricted to committed burst size (CBS).  Police Single-rate Rate limit the flow to meet committed information rate (CIR) Coloring based on committed burst size (CBS) and excess burst size (EBS)  Police Two-rate Rate limit the flow to meet committed information rate (CIR) and Excess information rate (EIR). Coloring based on committed burst size (CBS) and excess burst size (CBS).

7. Slide 7 Comarra Limited - 2006Slide 7 VCL-Ethernet SDH Solutions Egress CoS queues  Supports 1- 8 CoS queues  Supports following scheduling scheme Strict priority (SP) Weighted round robin (WRR) Weighted Fair queuing (WFQ) Combination of (WFQ or WRR) and strict priority.  Traffic shaping to restrict bandwidth usage per CoS queue to minimum (BMIN) or maximum (BMAX) configurable bandwidth.  HOL is avoided by dropping traffic after a configurable threshold is exceeded  Supports WRED to avoid congestion

8. Slide 8 Comarra Limited - 2006Slide 8 VCL-Ethernet SDH Solutions Broadband Help operators provide  New Revenue generating Broadband services By providing  Integration with existing networks  Network Predictability (Resilience of RPR and SDH)  Single Network Management  Best-in-class scalability

9. Slide 9 Comarra Limited - 2006Slide 9 VCL-Ethernet SDH Solutions Evolution of Broadband Services  Triple Play Services to residential subscribers High Speed Internet Access, Video-on-demand, IP-TV, Voice Quadruple play with Wireless  Broadband Connectivity services to business subscribers Leased Lines/Transparent LAN Services VPN Services

10. Slide 10 Comarra Limited - 2006Slide 10 VCL-Ethernet SDH Solutions Security Related Features  Access Control Lists: allows the traffic to be permitted or denied based on: VLAN ID IP ToS IP DSCP CoS Source/Destination MAC address EtherType Source/Destination IP Address Source/Destination L4 address Protocol field  Broadcast Storm control Can be enabled/disabled on a per-port basis  Port mirroring Allows mapping of all incoming and outgoing packets on any specified port to a “probe” port  Performance Monitoring The traffic statistics parameters can be provided every 15 mins and on daily basis Parameters are monitored per flow and per port basis Allows loop-back on a per port basis Supports connectivity fault management as per 802.1ag

11. Slide 11 Comarra Limited - 2006Slide 11 VCL-Ethernet SDH Solutions Ethernet Switching Card Applications

12. Slide 12 Comarra Limited - 2006Slide 12 VCL-Ethernet SDH Solutions SwitchMapper 8 FE + 2 GigE 10 VCG Client Interfaces STM-4 Uplink Ethernet Switching Cards

13. Slide 13 Comarra Limited - 2006Slide 13 VCL-Ethernet SDH Solutions Enterprise Broadband Services  Ethernet Line (E-Line) Service Type Point-to-point service EPL (Ethernet Private Line), EVPL (Ethernet Virtual Private Line)  Ethernet LAN (E-LAN) Service Type Multipoint-to-multipoint service Metro Ethernet Network Customer Site 1 Customer Site 2 Customer Site 3 VCL100 MSPP Metro Ethernet Network Customer Site 1 Customer Site 2 Customer Site 3 VCL100 CPE

14. Slide 14 Comarra Limited - 2006Slide 14 VCL-Ethernet SDH Solutions LAN Metro Core Metro Core LAN Customer LAN switch is connected to ELAN card at the two locations shown in figure P-to-p connection is set using Q-in-Q and n x VC- 12/3 backhaul with requisite CIR & EIR and 8 levels of CoS. Customer Premises Insert SPVLAN 3 Ethernet Leased lines

15. Slide 15 Comarra Limited - 2006Slide 15 VCL-Ethernet SDH Solutions Customer-1Site A Customer-1,Site B SDH Network VCG cap = 1 VC3 Customer-2 Site A Customer-2,Site B EVPL connection between two different sites of the two different customers with 6 Mbps backhaul carrying Video (VLAN ID = 1) and best effort (BE) (VLAN ID =2) traffic Q-in-Q provisioned to segregate customers Video traffic is policed/shaped to 4 Mbps and BE traffic to 2 Mbps Higher priority is assigned to video traffic Video traffic is policed/shaped to 4 Mbps and BE traffic to 2 Mbps Higher priority is assigned to video traffic Ethernet Virtual Private Lines

16. Slide 16 Comarra Limited - 2006Slide 16 VCL-Ethernet SDH Solutions Site D VCG cap = 2 VC4 Site A Site B Site C 2 VC-4 worth bandwidth are allocated between two neighboring nodes EPLAN connection between customer offices spread across 4 sites Each node learns the MAC address of all the customer sites After learning the traffic from any site to any other site is a unicast as shown Broadcast all destination look-up failure (DLF) traffic. Ethernet Private LAN

17. Slide 17 Comarra Limited - 2006Slide 17 VCL-Ethernet SDH Solutions VLAN 20-30 VLAN 20-30 Metro Core Metro Core VLAN 50-75 VLAN 50-75 VLAN 50-75 VLAN 50-75 VLAN 20-30 VLAN 20-30 Insert SPVLAN 3 Insert SPVLAN 4 Equipment at Customer premises s are connected to CPE CPE s are backhauled as n x VC-12/3 Customer Premise VCL100CPE CPE rings are interconnected to one another using n x VC-3/4 Ethernet Virtual LAN Services

18. Slide 18 Comarra Limited - 2006Slide 18 VCL-Ethernet SDH Solutions Remote DSLAMs are aggregated using transport card The access traffic from DSLAMs are aggregated using switching card and up- hauled as n x VC-3/4 The regional/metro traffic from access rings are up-linked using switching card to the core through GE ports Core Internet Backbone Core Internet Backbone Multiple DSLAM traffic are aggregated using FE/GE in switching card which is backhauled as n x VC-12/3s.(2/51 Mbps) POTS traffic is aggregated over E1 Multiple DSLAM traffic are aggregated using FE/GE in switching card which is backhauled as n x VC-12/3s.(2/51 Mbps) POTS traffic is aggregated over E1 Cross section DSLAM Aggregation

19. Slide 19 Comarra Limited - 2006Slide 19 VCL-Ethernet SDH Solutions E1 provisioned in the backhaul Ethernet provisioned DSLAM Aggregation: Cross-section

20. Slide 20 Comarra Limited - 2006Slide 20 VCL-Ethernet SDH Solutions RNC Traffic from Node B are aggregated using ELAN01 card toward RNC through a IP/MPLS router IP/MPLS router 3G Aggregation

21. Slide 21 Comarra Limited - 2006Slide 21 VCL-Ethernet SDH Solutions 10/100 Base T AutoNeg 100 Base T 10/100 BaseT Autoneg VCL100 Ethernet Card Detect by parallel detection Auto negotiation Auto-Negotiation

22. Slide 22 Comarra Limited - 2006Slide 22 VCL-Ethernet SDH Solutions Central Control Center CCTV SCADA Server LAN SCADA Remote node SCADA Remote node SCADA Remote node Present architecture has Layer 2 switches at all locations Converged architecture with ELAN01 allows Layer 2 switch functionality to be integrated. This allows Ease of operation due to centralized management Reduced Architecture Complexity Allows for efficient bandwidth utilization Converged architecture with ELAN01 allows Layer 2 switch functionality to be integrated. This allows Ease of operation due to centralized management Reduced Architecture Complexity Allows for efficient bandwidth utilization Video Camera SCADA

23. Slide 23 Comarra Limited - 2006Slide 23 VCL-Ethernet SDH Solutions Higher Opex Best-effort data service not enough Self- cannibalization Better Solution is Required! Current Complex Networks

24. Slide 24 Comarra Limited - 2006Slide 24 VCL-Ethernet SDH Solutions EIR/CIR Voice: Vo1: 200/300 : Vo2: 250/350 : Vo3: 250/350 Video: Vi1: 100/150 : Vi2: 100/150 : Vi3: 100/150 Data: D1: 500/700 : D2: 250/400 : D3: 250/350 Data flowVoice flow Video flow Policing according to CIR and EIR Customer A Customer B Customer C D1 D2 D3 Vo1 Vo2 Vo3 Vi1 Vi2 Vi3 700/1000 Congestion Control as per WRED 300/450 500/700 250/400 250/350 ClientGbe Shaping with bandwidth profile CoS N/W VCG N/W VCG N/W VCG Ref: Light Reading Webinar on Ethernet over SONET/SDH Implement Ethernet SLAs

25. Slide 25 Comarra Limited - 2006Slide 25 VCL-Ethernet SDH Solutions Simplified Multi-service Scalable Flexible Quality of Service The VCL100 offers a simple and elegant solution Lesser no. of NE SDH SONET RPR Ethernet Scalable design Offer new Services Resiliency Converged Network VCL100

26. Slide 26 Comarra Limited - 2006Slide 26 VCL-Ethernet SDH Solutions For more details visit us at our Website at http://www.comarra.co.uk 123 Springvale Road, Winchester Hants SO23 7LE UK Phone: +44 (0) 20 7871 9524 E-mail: info@comarra.co.uk Web Site: http://www.comarra.co.ukinfo@comarra.co.ukhttp://www.comarra.co.uk Thank you for your attention