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2026-10-21, Week 43 |
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* Edit or answer any Q&A by selecting Q&A number Hyper Link below + Write button (Save)
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ICACT20210195 Question.1
Questioner: ra-maneekut@kddi-research.jp 2021-02-10 오전 7:27:55 |
ICACT20210195 Answer.1
Answer by Auhor rashid_zaidi@yahoo.com 2021-02-10 오전 7:27:55
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| How many ONUs can be placed in a ring ? Since there are CWDM demux, CWDM combiner and 1x2 splitter inside each ONU, how much insertion loss from OLT to the last ONU ? Does it affect the network utilization and throughput ? |
Theoretically, maximum number of ONUs that can be supported are 256 with increased optical power. Assuming a 20 km trunk feeder fiber (0.25 dB/km loss), the first ONU is 20 km away from the OLT, and the last ONU is 23.2 km away from the OLT (ring circumference is about 3.2 km; 1 km diameter) and OLT Tx optical power is + 2 dBm; the power measured at the last ONU is -26.1 dBm. Hence with DS Rx (APD w/FEC) sensitivity of – 28.5 dBm, the total number of ONUs that can be adequately supported is equal to 16 ONUs. Therefore it doesn’t effect network utilization and throughput. |
ICACT20210195 Question.2
Questioner: ra-maneekut@kddi-research.jp 2021-02-10 오전 7:29:33 |
ICACT20210195 Answer.2
Answer by Auhor rashid_zaidi@yahoo.com 2021-02-10 오전 7:29:33
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| Could you please explain the simulation setup briefly in order to get results in slides 12-14 ? |
The following are the system parameters used for simulating the EPON-based RAN architecture: (1) a PON with 16 ONUs, each serving a varying number of BSs (a minimum of one BS to a maximum of 10 BSs), depending on the varying traffic load.; (2) aggregate access link data rate from the MSs to a given ONU is 100 Mb/s; (3) the RAN DS line rate (from the OLT/SGW(ePC) to the ONUs/BSs) is assumed to be same as the US line rate (from the ONUS/BSs to the OLT/SGW) and is equal to 1 Gb/s; (4) the average distance between the OLT/SGW(ePC) and ONS/BSs is 20 km; (5) we assume that all network traffic is just mobile traffic initiated by 5G MSs, i.e., traditional EPON’s fixed wired end-user’s traffic is assumed to be zero.
For more details please refer to the paper.
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ICACT20210195 Question.3
Questioner: ra-maneekut@kddi-research.jp 2021-02-10 오후 11:58:50 |
ICACT20210195 Answer.3
Answer by Auhor rashid_zaidi@yahoo.com 2021-02-10 오후 11:58:50
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| What the performance will look like if we increase the line rate from 1Gbps to 10 Gbps ? Does this method still perform better than the conventional one ? |
Thanks for the question, the performance will still look the similar as it is EPON-based. This will be our future work to test it at 10G and beyond. |
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