TECHNICAL
from the CO/Local Exchange (LEX) OLT is split into N-fibre distribution cable (where N = 32, 64, or 128) by a 1->N optical splitters located at the cabinet node, as shown, assuming a centralised (local convergence) optical splitting. The cabinet distribution area contains 1024 subscribers. Each 10G PON’s required number of feeder fibres is M, and average bitrates per subscriber for 1->N optical splitting (where N = 32, 64, or 128) are as follows: 5. For optical splitting: 1->N = 128; average bitrate per subscriber = 78Mb/s and M = 8 6. For optical splitting: 1->N = 64; average bitrate per subscriber = 155Mb/s and M = 16 7. For optical splitting: 1->N = 32; average bitrate per subscriber = 311Mb/s and M = 32 The required number of feeder fibres— and, hence, cost— increases linearly as feeder length and/or delivered bitrates increase. PON/active FTTx architecture (based on UA solution) with OLT remoted to cabinet node Figure 2b shows the implementation of the PON/active FTTx architecture based on the UA solution, with the 10G XGS- PON OLTs now remoted to a cabinet node and the traffic between the CO and the cabinet node aggregated on a pair of fibres using a pair of Ciena’s 5170s, as shown. At the cabinet node, signal carried by each 10Gb/s XGS-PON OLT is then split into N-fibre distribution cable (where N = 32, 64, or 128) by 1->N optical splitters located at the cabinet node as shown, assuming a centralised (local convergence) optical splitting. The cabinet distribution area contains 1024 subscribers. Each 10G PON’s required number of feeder fibres is M, and average bitrates per subscriber for 1->N optical splitting (where N = 32, 64, or 128) are as follows: 8. For optical splitting: 1->N = 128; average bitrate per subscriber = 78Mb/s and M = 2 9. For optical splitting: 1->N = 64; average bitrate per subscriber = 155Mb/s and M = 2 10. For optical splitting: 1->N = 32; average bitrate per subscriber = 311Mb/s and M = 2
fibre optics, and Adaptive IP™. By supporting all services, including mobility 4G/5G services, the UA expands a network provider’s application space and competitiveness. Choice—enabled by a smaller footprint, increased capacity, PON reach extension, and larger interconnect scale in platforms that automate and simplify deployment and turn-up tasks— results in operational flexibility and significant cost-savings for network operators now and in the future. n Solution components: 1. 5170 Platforms
2. 10G PON uOLT SFP+ 3. 10G PON uONU SFP+ 4. 380x 10G XGS PON ONU
The 10G XGS-PON FTTx architecture Traditional PON architecture with OLT located in CO Figure 2a shows the implementation of the traditional PON FTTx architecture, where symmetrical 10G XGS-PON OLTs are located at the CO and traffic is aggregated upstream on Ciena’s 5170 Platform. Each 10G XGS-PON OLT is connected to the cabinet node on a feeder fibre, wherein a single feeder fibre
Figure 1: UA solution
May 2024 Volume 46 No.2
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