Teknologi NG-PON2 dan XGS-PON

Tabel berikut merupakan persamaan dan perbedaan antara NG-PON2 dan XGS-PON

Attribut	NG-PON2	XGS-PON
Standard	G.989.x	G.9807.x
Nominal line rate	40 Gbit/s downstream capacity and 20 km reach with at least 1:64 split 10 Gbit/s upstream capacity and 20 km reach with at least 1:64 split Access to peak rates of 10/2.5 Gbit/s downstream/upstream Longer distances with lower split ratios are also possible Downstream and upstream nominal line rates per channel: 10 Gbit/s downstream dan 10 Gbit/s upstream 10 Gbit/s downstream and 2.5 Gbit/s upstream 2.5 Gbit/s downstream and 2.5 Gbit/s upstream	line rate transmisi, kelipatan 8 kHz. Sistem XGS-PON mendukung : downstream line rate 9.95328 Gbit/s dan upstream line rate 9.95328 Gbit/s.
Split ratio	256	64, 128, 256
Maximum distance	40 km (Logical: 60 km)	20 km (Logical: 60 km)
Maximum differential distance	20 km , 40 km 60 km dengan fiber extender	20 km , 40 km
Optical path loss	Class N1 : 14- 29dB Class N2 : 16-31 dB 20 km , 40 km 60 km dengan fiber extender Class E1: 18-33 dB Class E2 : 20 -35 dB	Class B+ : 13-28dB Class C+ : 17-32dB Class N1 : 14-29dB Class N2 : 16-31 dB Class E1: 18-33 dB Class E2 : 20 -35 dB
Protocol layering	(125us per frame)	(125us per frame)
Transmission medium	fibre sesuai dengan ITU-T Rec. G.652. [ITU-T G.657] digunakan untuk instalasi gedung/rumah dan drop	fibre sesuai dengan [ITU-T G.652]. Type fibre yang compatible [ITU-T G.657] digunakan untuk instalasi gedung/rumah dan drop
Transmission methodology	Bidirectional transmission menggunakan teknik WDM pada single fibre.	Bidirectional transmission menggunakan teknik wavelength division multiplexing (WDM) pada single fibre.
Line code	logic level : high level of light emission for a binary ONE; low level of light emission for a binary ZERO. Downstream and upstream: NRZ coding. Downstream line coding for 9.95328Gbit/s scrambled NRZ. Downstream line coding for 2.48832Gbit/s scrambled NRZ. Upstream line coding for 2.48832 Gbit/s scrambled NRZ. Upstream line coding for 9.95328 Gbit/s scrambled NRZ for 20 km reach, FFS (For Further Study) for 40 km reach.	logic level : high level of light emission for a binary ONE; low level of light emission for a binary ZERO. Downstream and upstream: NRZ coding.
Wavelength band	Wavelength compatible systems : GPON, RF video, XG-PON1 TWDM PON : Downstream : 1596-1603 nm. Upstream : Wideband option 1524-1544 nm Reduced band option 1528-1540 nm ;Narrow band option 1532-1540 nm PtP WDM PON : Upstream/downstream : Expanded spectrum 1524-1625 nm (Note 1) Shared spectrum 1603-1625 nm (Note 2)	Downstream : 1575-1580 Upstream : 1260-1280
Scrambling	polynomial x58 + x39 + 1	polynomial x58 + x39 + 1
ONU ID	10 bit, 0-1020 , 1023 (0x3FF) : broadcast message in the downstream direction or an ONU that has not been assigned an ONU-ID in the upstream direction 1021 (0x3FD) and 1022 (0x3FE) are reserved and should not appear as ONU-ID in PLOAM messages	10 bit, , 0..1020 : assignable 1021 : reversed 1022 : broadcast/reversed 1023 : broadcast/unassigned
Alloc-ID	14 bit, 0 - 16383 0 - 1020 : default 1021 - 1023 : broadcast 1024..16383 : assignable	14 bit, 0 - 16383 0 - 1020 : default 1021 - 1023 : broadcast 1024..16383 : assignable
XGEM port ID	16 bit, 0 - 65535 0..1020 : default 1021..65534 : Assignable 65535 : Idle	16 bit, 0 - 65535 0..1020 : default 1021..65534:Assignable 65535 : Idle
Service mapping	Ethernet/ MPLS	Ethernet/ MPLS

Referensi

• Rec. ITU -T Rec. G.989.x
• Rec. ITU-T G.9807.1