Differences among GPON XG-PON and XGS-PON

With telecommunication development these years, GPON has evolved to XGPON and XGS-PON step by step.

 

PON has become the mainstream technology of FTTx network construction, but with users’ strong demands for high-bandwidth such as OTT Video and 4kTV, commercial use of 10G GPON has been put on the agenda by many operators. Moreover, from the perspective of technical standards and industrial chain development, 10G GPON has been improved, which is the best choice for FTTH high-bandwidth network construction.

 

What Is GPON?

Passive Optical Network (PON) is a point to multi-point (P2MP) passive optical network. Mainstream PON technologies include broadband passive optical network (BPON), Ethernet passive optical network (EPON), and gigabit passive optical network (GPON). Adopting the ATM encapsulation mode, BPON is mainly used for carrying ATM services. With the obsolescence of the ATM technology, BPON also drops out. EPON is an Ethernet passive optical network technology. GPON is a gigabit passive optical network technology and is to date the most widely used mainstream optical access technology. GPON is defined by ITU-T Recommendation G.984.x.

 

GPON network architecture

 

What Is 10G GPON?

10G GPON is evolved from the existing GPON technology; the factors promoting the technology evolution to 10G GPON are as follows:

• Developing services require higher bandwidths and the GPON technology cannot meet bandwidth requirements.

• Innovative access technologies on the user side require higher bandwidths and the GPON technology will face bandwidth bottlenecks.

• A greater split ratio and a longer transmission distance increase network construction investments.

   

10G GPON has two standards, XG-PON and XGS-PON

• XG-PON, asymmetric 10G GPON, provides asymmetric 10G GPON transmission (Maximum downstream line rate: 9.953 Gbit/s, Maximum upstream line rate: 2.488 Gbit/s ).

• XGS-PON, symmetric 10G GPON, provides symmetric 10G GPON transmission (Maximum downstream line rate: 9.953 Gbit/s, Maximum upstream line rate: 9.953 Gbit/s ).

10G GPON Network Structure

 

Specification differences between 10G GPON and GPON

Specifications	GPON	10G GPON
		XG-PON	XGS-PON
Wavelength	Downstream: 1480-1500 nm Upstream: 1290-1330 nm	Downstream: 1575-1580 nm Upstream: 1260-1280 nm	Downstream: 1575-1580 nm Upstream: 1260-1280 nm
Center wavelength	Downstream: 1490 nm Upstream: 1310 nm	Downstream: 1577 nm Upstream: 1270 nm	Downstream: 1577 nm Upstream: 1270 nm
Maximum Line Rate	Downstream: 2.488 Gbit/s Upstream: 1.244 Gbit/s	Downstream: 9.953 Gbit/s Upstream: 2.488 Gbit/s	Downstream: 9.953 Gbit/s Upstream: 9.953 Gbit/s
Frame structure	GEM	XGEM
Maximum Physical Transmission Distance	60 km NOTE: The physical reach is defined by split ratio, optical   module size, and fiber quality.	100 km NOTE: The physical reach is defined by split ratio, optical   module size, and fiber quality.	100 km NOTE: The physical reach is defined by split ratio, optical   module size, and fiber quality.
Maximum Split Ratio	1:128 NOTE: The actual split ratio depends on the optical module   model and fiber distance.	1:256 NOTE: The actual split ratio depends on the optical module   model and fiber distance.	1:256 NOTE: The actual split ratio depends on the optical module   model and fiber distance.

 

10G GPON FTTH scenario

1, GPON and 10G GPON mixed

10G GPON and GPON share one ODN, but because of different wavelength between 10G GPON and GPON, a passive wavelength division multiplexing device WDM1r is needed.

Advantage: sharing one ODN, save the ODN construction cost

Disadvantage: 10G GPON ONU and GPON ONU are complex, difficult to maintainance

 

2, Construct new 10G GPON

10G GPON and GPON network are separated physically, clear network structure, which is convenient for management and unified business planning.

 

Huawei OLT XG-PON and XGS-PON board

1, MA5600T series OLT MA5608T, MA5683T, MA5680T only support asymmetric XG-PON

XGBC, 4-port asymmetric 10G GPON OLT Interface Board

XGBD, 8-port asymmetric 10G GPON OLT Interface Board

2, MA5800 series OLT MA5800 X2, X7, X15 and X17 can supports XG-PON and XGS-PON, also GPON & XGPON combo, here are the boards list.

Board	GPON	XGPON	XGSPON	port and SFP	combo
TWED		XGPON	XGSPON	8, SFP+
XGHD		XGPON		8, SFP+
XGLD		XGPON		8, SFP+
XGSF		XGPON		16, SFP+
XGLF		XGPON		16, SFP+
XSHF		XGPON	XGSPON	16, SFP+
XSHD		XGPON	XGSPON	8, SFP+
CGID	GPON	XGPON		8, XFP	combo
CGUD	GPON	XGPON		8, XFP	combo
CGHD	GPON	XGPON		8, SFP+	combo
CGHF	GPON	XGPON		16, SFP+	combo
CGUF	GPON	XGPON		16, SFP+	combo
CSHF	GPON		XGSPON	16, SFP+	combo
CSHD	GPON		XGSPON	8, SFP+	combo

 

GPON, XGPON and XGSPON have different transmission rate, and they can share one ODN, or use separate ODN. If you are still not clear about the difference or if you want to know more details about Huawei 10G GPON products, you can contact us directly.