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SONET/SDH Emulation CEP-11

SONET/SDH Emulation CEP-11. Andy Malis, Tellabs Prayson Pate, Overture Networks Ron Cohen, Resolute Networks David Zelig, Corrigent. 4xVC-12. VC-4. MPLS PSN. STM-4 SDH Ring. Structured SDH Emulation. 4xE1. STM-4. STM-1. 4xVC-4. VC-4. CEP-10.

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SONET/SDH Emulation CEP-11

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  1. SONET/SDH EmulationCEP-11 Andy Malis, Tellabs Prayson Pate, Overture Networks Ron Cohen, Resolute Networks David Zelig, Corrigent

  2. 4xVC-12 VC-4 MPLS PSN STM-4 SDH Ring Structured SDH Emulation 4xE1 STM-4 STM-1 4xVC-4 VC-4

  3. CEP-10 • Draft has been stable for a long while (over 3 years) • However, Control Word is not aligned with Recommended PW Control Word • Not ECMP friendly • Can not run VCCV • Special CEP MPLS adaptation header used • Not aligned with other L1 TDM PW

  4. CEP-10 CW • E: Header Extension • R: Remote Defect Indication (CEP-RDI) • D: DBA mode (Compressed Payload) • N,P: Pointer Adjustment Indications and CEP-AIS • Structure Pointer: Offset of SPE/VT in packet • Sequence number: 14 bits (16 bits in PW-CW)

  5. PW-CW • Flags: Service Specific Flags • FRG: Fragmentation (First, Intermediate, Last) • Length: Optional (Set if payload below 64 bytes) • Sequence Number: all values used (L1 services), 0 as non sequenced (L2 services) indication

  6. CEP-11 CW • L: Forward Defect Indication (CEP-AIS) • R: Remote Defect Indication (CEP-RDI) • N,P: Pointer Adjustment Indications • FRG: Set to Zero • Length: Used to signal DBA (no payload) • Sequence number: L1 (all values) • Structure Pointer: 13 bits

  7. CEP-11 Fractional VC-4 CW • Extension headers configured on both ends (no E bit)

  8. Pointer Indications • N,P • 0,0 : Normal Operation • 1,0 : Negative Pointer Justification Indication • 0,1 : Positive Pointer Justification Indication • 1,1 : Loss of Pointer Alarm • All indications are replayed three times (this is a change from CEP-10 were VT N,P indications are on super-frame boundaries)

  9. TDM PWs E1 4xE1 CESoPSN PE SATOP PE MS PE NxDS0 CEP PE 4xE1 VC-4 MPLS PSN STM-4 STM-1 4xVC-4 VC-4

  10. Questions? Thanks!

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