1. draft-dharinigert-ccamp-g-698-2-lmp-10
Extension to the Link Management Protocol (LMP/DWDM -rfc4209) for Dense Wavelength Division Multiplexing (DWDM) Optical Line Systems to manage the application code of optical interface parameters in DWDM application
draft-dharinigert-ccamp-g lmp-10
IETF 93 – CCAMP WG
Editors:
Dharini Hiremagalur
Gert Grammel
Gabriele Galimberti
Zafar Ali
Ruediger Kunze
Dieter Beller

2. Agenda Changes: new use cases added to the draft:
Access link power monitoring
Power Control Loop Use Case
Related ITU-T activities
Next steps
22-Jul-15
IETF 93 CCAMP Prague

3. Changes
2 new use cases were added to the draft that are motivating why LMP shall convey transmitter and receiver power values:
Access Link power Monitoring Use Case
Power Control Loop Use Case
22-Jul-15
IETF 93 CCAMP Prague

4. ITU-T Recommendation G.698.2 Data Plane Reference Model
G.698.2/Figure 5-3 – Linear "black link" approach for bidirectional applications
22-Jul-15
IETF 93 CCAMP Prague

5. Access Link (AL) Power Monitoring Use Case based on ITU-T Recommendation G.698.2
For AL monitoring: PTx and aTx must be known
ROADM
Power
Monitor
External Optical Transponder
PTx
Pin
Pin = PTx – aTx Ss
● ● ● Tx
Access Link with
Attenuation aTx [dB]
For AL monitoring: Pout and aRx must be known
Power
Monitor
PRx
Pout Rs
● ● ● Rx
Access Link with
Attenuation aRx [dB]
PRx = Pout – aRx
An alarm shall be raised if Pin or PRx drops below a configured threshold t [dB]: Pin < PTx – aTx – t (Tx direction), PRx < Pout – aRx – t (Rx direction), aTx ≈ aRx
22-Jul-15
IETF 93 CCAMP Prague

6. Access Link (AL) Power Monitoring Use Case based on ITU-T Recommendation G.698.2
ROADM
PTx, PRx
LMP
LMP
Power
Monitor
External Optical Transponder
PTx
Pin
Pin = PTx – aTx Ss
● ● ● Tx
Access Link with
Attenuation aTx [dB]
Power
Monitor
PRx
Pout Rs
● ● ● Rx
Access Link with
Attenuation aRx [dB]
PRx = Pout – aRx
22-Jul-15
IETF 93 CCAMP Prague

7. Power Control Loop Use Case based on ITU-T Recommendation G.698.2
PTx, PRx
ROADM
LMP
LMP
Power Control
set PTx
Power
Monitor
External Optical Transponder
set PTx
PTx
Pin Ss
● ● ● Tx
Access Link with
Attenuation aTx [dB]
set VOA
PRx
Pout Rs
● ● ● Rx
Access Link with
Attenuation aRx [dB]
Variable Optical Attenuator
22-Jul-15
IETF 93 CCAMP Prague

8. LMP Requirements Access Link (AL) Power Monitoring Use Case:
LMP shall be capable to convey the current transmit power PTx and the received power PRx from the external transponder to the physically adjacent ROADM on the DWDM network boundary
Power Control Loop Use Case:
In addition to the above requirement, LMP shall be capable to convey a “set PTx” command from the ROADM on the DWDM network boundary to the external transponder to modify the transponder’s transmit power. The PTx value must be within the PTx power range defined by Application Code currently in use.
22-Jul-15
IETF 93 CCAMP Prague

9. Related ITU-T SG15 Activities
A multi-company ITU-T contribution C1454 (ALU, Cisco, DT) was submitted to the SG15 meeting (22 June - 3 July 2015):
Proposal: extend G.874 (management requirements) and the OTN information model as defined in G “It is proposed to define single channel optical power monitors (see G.697, section 6.1.2) for the optical tributary signal as information model extension for the network element supporting the G application.”
SG15 meeting outcome:
It was agreed that G.874 and G will be enhanced as proposed.
The power monitoring capability will be specified as an optional feature and is not supposed to be mandatory for G implementations.
22-Jul-15
IETF 93 CCAMP Prague

10. Next Steps Solicit feedback/comments from the group.
Define a new LMP TLV for the “set PTx” command.
Authors will help ITU-T Q14/15 to define the G.874 and G extensions to support the optional optical power monitoring points (contribution to the upcoming Q14/15 interim meeting).
No open issues.
22-Jul-15
IETF 93 CCAMP Prague

11. Thank You!
22-Jul-15
IETF 93 CCAMP Prague