| Attribut | GPON | XGPON |
|---|---|---|
| Standard | G.984.x | G.987.x |
| Nominal line rate | 2.48832 Gbps D/S 1.24416 Gbps U/S |
9.95328 Gbps D/S 2.48832 Gbps U/S |
| Split ratio | 32/64/128 | ≥64 |
| Maximum distance | 20 km (Logical: 60 km) |
≥ 20 km (Logical: ≥ 60 km) |
| Maximum differential distance | 20 km | sampai dengan 40 km |
| Optical path loss |
Class A : 5-20 dB Class B : 10-25dB Class B+: 13-28dB Class C : 15-30dB Class C+: 17-32dB |
N1（14 – 29dB) N2（16 – 31dB) Extend to 33/35dB |
| Protocol layering | DS:38880 Byte, US:19440 Byte (125us per frame) |
DS:155520 Byte, US:38880 Byte (125us per frame) |
| Transmission medium | fibre sesuai dengan ITU-T Rec. G.652. | 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 : teknik wavelength division multiplexing (WDM) pada single fibre, atau unidirectional transmission over two fibres | Bidirectional transmission menggunakan wavelength division multiplexing (WDM) technique on a 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. |
logic levels : – high level of light emission for a binary ONE; – low level of light emission for a binary ZERO. Downstream line coding for XG-PON1: NRZ. Upstream line coding for XG-PON1: NRZ. |
| Operating wavelength | downstream - single fibre systems : 1480 -1500 nm. - two fibre systems : 1260-1360 nm. Upstream : 1260-1360 nm. |
Downstream : 1575-1580 nm Upstream : 1260-1280 nm |
| Scrambling | 8 bit scrambler: polynomial x7 + x6 + 1 |
58 bit scrambler: polynomial x58 + x39 + 1 |
| ONU ID | 8 bit, 0 - 253, 254 dan 255 cadangan |
10 bit, 0 - 1021, 1022 dan 1023 cadangan |
| Alloc-ID | 12 bit, 0 - 4095 | 14 bit, 0 - 16383 |
| GEM port ID | 12 bit, 0 - 4095 | 16 bit, 0 - 65535 |
| Service mapping | Native TDM/ Ethernet/ IP/MPLS /SDH | Ethernet/ MPLS |
Referensi
- Rec. ITU -T Rec. G.984.2 (03/2003)
- Rec. ITU -T Rec. G.984.6 (03/2008)
- Rec. ITU-T G.987.2 (01/2010)
- Materi Training Huawei GPON Operation and Maintenance
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