2. Enables migration of traditional services over packet network Combines TDM legacy and packet services over unified tunnel Comply to latest industry CES standards to assure interoperability Full MEF NID/UNI functionality on all interfaces at wire-speed Dynamic bandwidth optimization with enhanced Hierarchical QoS Real-time voice TDM traffic assured with the highest QoS allocation Bandwidth reuse technique to fill the rate SLAs Services monitored to SLA via extensive OAM OS910-M: A Pseudowire � Solution Highlights

3. OS910-M - Supported CES Standards OS910-M supports TDM traffic via the following CES standards: IETF RFC 4553 structure-Agnostic TDM over packet (SAToP) IETF pwe3-CESoPSN structure-aware CES over packet switched network MEF 8 CESoEth � PDH over Metro Ethernet networks (Layer 2 ) Fully supported CESoMPLS tunneling and traffic engineering IEEE1588 (HW ready) � Clock synchronization protocol for Ethernet networks Framed & unframed G.703 & G.704 compliance Jitter/wander G.823 & G824 compliance

4. CES Packet Format and Standards The all standards are intentionally similar

5. CES Technology Supported in OS9 Models Supported Chassis: CES Line cards: 4 x E1/T1 CES ports Internal high-precision clock Single & Multiple clock domains Any physical port can get the clock from a different session Any physical port can be configured with primary/secondary clock for protection Single E1/T1 CES port

7. OptiSwitch OS9024M-210Gx Model for CES

8. EM9-CES-4E1/T1c & EM9K-CES-4E1/T1c EM9K-CES-4E1/T1c card for OS9024M-210G platform Future EM9-CES-STM1* 1-port OC-3/STM-1 - 1:1 protected Circuit Emulation Service aggregation module

9. OS910-M - TDM Clock Synchronization modes The Circuit Emulation Service enables convergence and transport of TDM circuits (E1/T1) over packet-switched networks. To do so, it must feature a mechanism capable of maintaining and keeping the TDM clock synchronized between peers of a pseudowire, in order to maintain E1/T1 circuit clock continuity across the packet network, and to meet the standards of ITU G.823 and G.824. Supported CES timing modes Adaptive Differential Line Loopback Internal * High-precision clock CES modules (EM9-CES-4E1/T1c) enable synchronous timing capability for wireless backhaul applications Supported CES timing modes Adaptive Differential Line Loopback Internal * High-precision clock CES modules (EM9-CES-4E1/T1c) enable synchronous timing capability for wireless backhaul applications

10. High-precision clock CES modules High-precision clock CES modules (EM9-CES-4E1/T1c) enable synchronous timing capability for wireless backhaul applications The on-board internal precision clock used as a transmit clock to the TDM gear A fallback external clock can be used for high protection External primary and internal fallback can be configured

11. CES services can be delivered over: Ring, star and mesh topologies S-VLAN provider bridged, PWE3 VC and H-VPLS transport QoS enabled packet network to deliver real-time CES requirements Circuit Emulation Services � Topology & Transport Latency Jitter Loss A = 30 ms = 10 ms = 1x10-6 B = 50 ms = 12 ms = 1x10-4 C = 100 ms = 10 ms = 1x10-4 Latency Jitter Loss A = 30 ms = 10 ms = 1x10-6 B = 50 ms = 12 ms = 1x10-4 C = 100 ms = 10 ms = 1x10-4

12. CES and Ethernet over MPLS Supported CESoMPLS tunneling and traffic engineering Bi-directional connection based on transport LSP CIR rates for CES traffic and E-LSP Signaling and provisioning based on standard protocols LDP, CR-LDP, RSVP-TE, OSPF-TE MPLS OAM - LSP ping and traceroute Service OAM - IEEE802.1ag CFM & ITU-T Y.1731 PM Continuity Check Protocol � pro-active/periodic Loopback Protocol � on-demand Linktrace Protocol � on-demand Performance measurement - pro-active/periodic

13. Potential Markets & Applications Wireless Backhaul Cellular TDM over Packet Switched Networks & fiber infrastructure Metro Ethernet Networks Offering voice TDM E1/T1 over fiber infrastructure to PSTN Utilities Offering traditional E1/T1 leased lines & TDM over fiber infrastructure

14. Cellular Backhaul Application Cell-Site backhaul � Market size - $2.4B (Infonetics Research 2007) 3G base station deployed in dense configurations More bandwidth required for voice & data OS910-M CES technology reduce OPEX and leased lines costs

16. Connectivity of an E1/T1 trunks and PBXs over Metro Network Offering voice TDM E1/T1 over fiber infrastructure to PSTN Preserves native TDM functionality, signaling and clocking Structured & unstructured G.703 & G.704 compliance Voice PBX over Metro Ethernet Application

17. Offering traditional E1/T1 leased lines & TDM over fiber infrastructure Enables private line service to legacy SDH/SONET network Preserves native TDM functionality, signaling and clocking Structured & unstructured G.703 & G.704 compliance Utility � Leased lines & data Application

18. Structured emulation mode � CESoPSN / CESoETH DS1 Robbed Bit Signaling or E1 CAS supported Multiple lower-rate (n x 64kbps) transparent services are multiplexed Virtual concatenation: DS0s (or E1s/T1s timeslots) to different destinations Bandwidth allocation to low-rate CES sessions can be at >100kbps Multipoint-2-Point CES fractional Multiplexed Service Nx64 Service is intended to emulate a point-to-point Fractional DS1 or E1 circuit. The service is typically accessed via either 1.544 Mbit/s DSX-1 [T1.102] interfaces or a 2.048 Mbit/s E1 [G.703] interfaces Nx64 Service is intended to emulate a point-to-point Fractional DS1 or E1 circuit. The service is typically accessed via either 1.544 Mbit/s DSX-1 [T1.102] interfaces or a 2.048 Mbit/s E1 [G.703] interfaces

19. Configuration Examples

20. Clock Configuration ------------------------------------------------------------------------- OS9024M-210GX(config-tdm2)# show clock Parameter : Slot-2 Slot-3 ----------------------------- : ------ ------ Clock mode : LINE_1 RECOVERY Input External : NONE NONE Input Reference : OWN_OCXO OWN_OCXO Output : NONE NONE OS9024M-210GX(config-tdm2)# -------------------------------------------------------------------------

21. CES Session Configuration ----------------------------------------------------------------------------------- OS9024M-210GX(config-tdm2)# show session detail s02 Item : Value ------------------------------: --------- Session mode : Enable Header type : CESoETH Local ECID : 34 Target ECID : 34 Target MAC : 00:12:72:00:5e:54 Layer 2 support mode : VLAN Payload length (frames) : 8 Jitter maximum level (ms) : 5 VLAN enable : Disable MPLS enable : Disable RTP enable : Disable Transport emulation type : Unstructured Session bandwidth (in Kbps) : 2256 Payload suppression : Disable Port : 1 Time Slots : 1-32 -------------------------------------------------------------------------------------------------

22. CES Session Configuration Statistics --------------------------------------------------------------------- Time Slots : 1-32 STATUS/STATISTICS Item : Status/Value -----------------------------------: --------- Clocking mode : LINE1 Eth to TDM direction : UP TDM to Eth direction : UP Current jitter buffer delay (ms) : 4492 Jitter maximum level (ms) : 4996 Jitter minimum level (ms) : 3996 Valid Eth packets per sec : 100 Handled Eth packets : 229302 Late Eth packets : 0 Lost Eth packets : 0 Packets per seconds : 1000 Underrun Eth packets : 406 Overrun Eth packets : 0 Malformed packets counter : 0 Duplicate Eth packets : 0 OS9024M-210GX(config-tdm2)# -----------------------------------------------------------------------

23. TDM Ports Configuration ------------------------------------------------------------------------------------------------- OS9024M-210GX(config-tdm2)# sh tdm-ports config Clocking_mode : LINE_1 LIU line format: E1 Modified Running_config : Port1 Port2 Port3 Port4 ----------------------------- : ----- ----- ----- ----- Port state : Enabled Enabled Enabled Enabled LIU framer type : DS26524 DS26524 DS26524 DS26524 LIU line code : HDB3 HDB3 HDB3 HDB3 LIU line build out : 120NORM 120NORM 120NORM 120NORM LIU monitor gain : NORMAL NORMAL NORMAL NORMAL LIU Rx equalizer gain limit : Short Short Short Short LIU jitter attenuation : Disabled Disabled Disabled Disabled LIU loopback : Disabled Disabled Disabled Disabled Framed mode : Unframed Unframed Unframed Framed Frame format : - - - PCM31 Channel bandwidth : - - - Fram_64K TDM signaling type : - - - CCC OS9024M-210GX(config-tdm2)# -------------------------------------------------------------------------------------------------

24. TDM Ports Status ------------------------------------------------------------------------------------------- OS9024M-210GX(config-tdm2)# show tdm-ports status Status : Port1 Port2 Port3 Port4 ---------------: ----- ----- ----- ----- Port status : ACTIVE ACTIVE ACTIVE ACTIVE Link : UP DOWN DOWN DOWN LIU loopback : DISABLE DISABLE DISABLE DISABLE NoAlarm : no alarm - - - RcvFarEndLOF : - - - - XmtFarEndLOF : - - - - RcvAIS : - - - - XmtAIS : - ais (tx) ais (tx) - LossOfFrame : - - - - LossOfSignal : - los los los LoopbackState : - - - - T16AIS : - - - - RcvFarEndLOMF : - - - - XmtFarEndLOMF : - - - - Others : - - - - OS9024M-210GX(config-tdm2)# -------------------------------------------------------------------------------------------

25. TDM Ports Configuration ---------------------------------------------------------------------------------------------- OS9024M-210GX(config-tdm2)# sh tdm-ports Clocking_mode : LINE_1 LIU line format: E1 Configuration Modified Running_config : Port1 Port2 Port3 Port4 ----------------------------- : ----- ----- ----- ----- Port state : Enabled Enabled Enabled Enabled LIU framer type : DS26524 DS26524 DS26524 DS26524 LIU line code : HDB3 HDB3 HDB3 HDB3 LIU line build out : 120NORM 120NORM 120NORM 120NORM LIU monitor gain : NORMAL NORMAL NORMAL NORMAL LIU Rx equalizer gain limit : Short Short Short Short LIU jitter attenuation : Disabled Disabled Disabled Disabled LIU loopback : Disabled Disabled Disabled Disabled Framed mode : Unframed Unframed Unframed Framed Frame format : - - - PCM31 Channel bandwidth : - - - Fram_64K TDM signaling type : - - - CCC Status ----------------------------------------------------------------------------------------------

26. TDM Ports Configuration (cont�) ------------------------------------------------------------------------------------------- Status : Port1 Port2 Port3 Port4 ---------------: ----- ----- ----- ----- Port status : ACTIVE ACTIVE ACTIVE ACTIVE Link : UP DOWN DOWN DOWN LIU loopback : DISABLE DISABLE DISABLE DISABLE NoAlarm : no alarm - - - RcvFarEndLOF : - - - - XmtFarEndLOF : - - - - RcvAIS : - - - - XmtAIS : - ais (tx) ais (tx) - LossOfFrame : - - - - LossOfSignal : - los los los LoopbackState : - - - - T16AIS : - - - - RcvFarEndLOMF : - - - - XmtFarEndLOMF : - - - - -------------------------------------------------------------------------------------------

28. Network proven, OS910 architecture & Master-OS feature-set Industry leading feature set for Metro Ethernet Used by multiple customers in Metro segment Class leading traffic management Hierarchical QoS Per flow traffic CIR/EIR conforming with MEF 14 (certified) CoS-aware rate limit for bandwidth reuse profiles Metro Ethernet UNI services E-LAN, E-Line and EPL MEF 9 UNI certified Highly reslient 50ms protection SLA provisioning and enforcement Modular Carrier-class design Dual redundant hot-swap power supplies Fan redundancy N+1 Temperture controled automated Front-to-back cooling High MTBF (220,000hr Telcordia/Bellcore SR-332) Monitoring of fans, power and temperature for SNMP alarms OS910-M Key Features

29. OS910-M - Circuit Emulation Services Circuit Emulation over Ethernet/IP/MPLS networks P2P and point-to-multipoint topologies over wired & wireless Preserves native TDM functionality, signaling and clocking Connectivity of an E1/T1 trunks and PBXs Complies with IETF PWE3, CESoPSN/SAToP & CESoETH (MEF3/8) Framed & unframed G.703 & G.704 compliance Virtual concatenation: DS0s (or E1s/T1s timeslots) to different destinations Jitter/wander compliance G.823 & G824 Precise Clock synchronization � timing recovery over PSN

30. CES Line Card Specifications Summary