## 7 Future Work
Spectral Grids for WDM Applications: DWDM Frequency Grid. 2012. Available online: [[https://www.itu.int/rec/](https://www.itu.int/rec/)]([https://www.itu.int/rec/](https://www.itu.int/rec/)) (accessed on 5 September 2019). * (26) [PERSON]; [PERSON]; [PERSON]; [PERSON] [PERSON]; [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON]; [PERSON]; [PERSON] [PERSON]; et al. Next generation elastic optical networks: The vision of the European research project IDEALIST. _IEEE Commun. Mag._**2015**, _53_, 152-162. Available online: [[https://ieeexplore.ieee.org/document/7045404](https://ieeexplore.ieee.org/document/7045404)]([https://ieeexplore.ieee.org/document/7045404](https://ieeexplore.ieee.org/document/7045404)) (accessed on 2 September 2019). [CrossRef]
* (27) 3 GPP, TS 38.401 V15.6.0. Technical Specification Group Radio Access Network: NG-RAN Architecture Description. Rel-15. 2019. Available online: [https://portal.3 gpp.org/desktopmodules/Specifications](https://portal.3 gpp.org/desktopmodules/Specifications) (accessed on 26 September 2019). * (28) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Elastic Optical Networks: The Global Evolution to Software Configurable Optical Networks. _Bell Labs Tech. J._**2013**, _18_, 133-151. Available online: [[https://ieeexplore.ieee.org/document/6772713](https://ieeexplore.ieee.org/document/6772713)]([https://ieeexplore.ieee.org/document/6772713](https://ieeexplore.ieee.org/document/6772713)) (accessed on 5 September 2019). [CrossRef]
* (29) 3 GPP, TS 38.104 V16.1.0. Technical Specification Group Radio Access Network; NR; Base Station (BS) Radio Transmission and Reception. 2019. Available online: [https://portal.3 gpp.org/desktopmodules/Specifications](https://portal.3 gpp.org/desktopmodules/Specifications) (accessed on 15 October 2019). * (30) ITU-T, Series G, Supplement 55. Study Group 15. Radio-over-Fibre (RoF) Technologies and Their Applications. 2015. Available online: [[https://www.itu.int/rec/T-REC-G.Sup55/en](https://www.itu.int/rec/T-REC-G.Sup55/en)]([https://www.itu.int/rec/T-REC-G.Sup55/en](https://www.itu.int/rec/T-REC-G.Sup55/en)) (accessed on 10 September 2019). * (31) CPRI Industry Forum (Ericsson, Huawei, NEC, and Nokia). CPRI Specification 7.0. 2015. Available online: www.cpri.info (accessed on 10 September 2019). * (32) CPRI Industry Forum (Ericsson, Huawei, NEC, and Nokia). eCPRI Specification 2.0. 2019. Available online: www.cpri.info (accessed on 10 September 2019). * (33) IEEE, 1588v2. IEEE Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control Systems. PNCS--Precise Networked Clock Synchronization Working Group. 2008. Available online: [[https://standards.ieee.org/standard](https://standards.ieee.org/standard)]([https://standards.ieee.org/standard](https://standards.ieee.org/standard)) (accessed on 21 August 2019). * (34) ITU-T, G.8261. Timing and Synchronization Aspects in Packet Networks. 2019. Available online: [[https://www.itu.int/rec/T-REC-G.8261](https://www.itu.int/rec/T-REC-G.8261)]([https://www.itu.int/rec/T-REC-G.8261](https://www.itu.int/rec/T-REC-G.8261)) (accessed on 12 October 2019). * (35) ITU-T, G.8262. Timing Characteristics of Synchronous Ethernet Equipment Slave Clock. 2018. Available online: [[https://www.itu.int/rec/T-REC-G.8262](https://www.itu.int/rec/T-REC-G.8262)]([https://www.itu.int/rec/T-REC-G.8262](https://www.itu.int/rec/T-REC-G.8262)) (accessed on 12 September 2019). * (36) IEEE. 1914 (1914.1 Standard for Packet-Based Fronthaul Transport Networks, 1914.3 Standard for Radio Over Ethernet Encapsulations and Mappings). Next Generation Fronthaul Interface. 2018. Available online: [[https://standards.ieee.org/standard/](https://standards.ieee.org/standard/)]([https://standards.ieee.org/standard/](https://standards.ieee.org/standard/)) (accessed on 11 September 2019). * (37) IEEE, P802.ICM. Draft V2.2. Time-Sensitive Networking for Fronthaul. 2018. Available online: www.ieee802.org (accessed on 25 August 2019). * (38) ITU-T, G.709 and Amendments 1-3.