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XGHD, CGHF and CGID are all service boards of the MA5800 series of Huawei OLT. This article will lead you to understand the similarities and differences of these three service boards, so that you can choose your own suitable board.
The H901XGHD board is an 8-port XG-PON interface board. It works with the optical network unit (ONU) to provide XG-PON access services.

Working principle of the H901XGHD board:

The H901CGHF board is a 16-port XG-PON and GPON Combo OLT interface board. It works together with the optical network unit (ONU) to provide XG-PON and GPON access services.

H901CGHF application scenario

H901CGID is an 8-port XG-PON&GPON Combo OLT interface board, which cooperates with ONU (Optical Network Unit) equipment to realize the access of XG-PON and GPON services.

Working principle of the H901CGID board

These three service boards all support XG-PON services. Compared with GPON, X represents the Roman numeral “10”. Therefore, XG-PON compared to Gpon shows that the use of Ethernet on the user side increases the upload and download speed, especially the download speed. .

The big difference between XGBD and CGID is that CGID supports Combo, that is, it supports the adaptation of Gpon and XG-PON. Compared with XGBD, it has more WDM1R wavelength division function, which can realize the co-networking of XGPON and GPON services. CGHF is a Combo XGPON service board with 16 interfaces. The number of interfaces is 8 more than CGID, and the slot bandwidth and forwarding capacity are also 120 Gbit/s.

The default frame rate of these three service boards is 2052 bytes, but it can be increased to 9216 bytes by using the Jumbo Frame function. The so-called frame is the abbreviation of data frame, which is the protocol data unit of the data link layer. It includes three parts: frame header, data part, and frame tail. Among them, the frame header and frame tail contain some necessary control information, such as synchronization information, address information, error control information, etc.; the data part contains data passed down from the network layer, such as IP packets, and so on.

For specific data comparison, please check the following table:

Specification	XGHD	CGID	CGHF
Port quantity	8	8	16
Forwarding capability	80 Gbit/s	80 Gbit/s	200 Gbit/s
Rate mode	Asymmetric rate	Asymmetric rate	Asymmetric rate
Port rate	Upstream: 2.488 Gbit/s Downstream: 9.953 Gbit/s	GPON upstream: 1.244 Gbit/s GPON downstream: 2.488 Gbit/s	GPON upstream: 1.244 Gbit/s GPON downstream: 2.488 Gbit/s
		XG-PON upstream: 2.488 Gbit/s XG-PON downstream: 9.953 Gbit/s	XG-PON upstream: 2.488 Gbit/s XG-PON downstream: 9.953 Gbit/s
Maximum split ratio	1:256	GPON: 1:128	GPON: 1:128
		XG-PON: 1:256	XG-PON: 1:256
T-CONTs per PON port	2048	GPON/auto type ONU: 1024	GPON/auto type ONU: 1024
		XG-PON: 2048	XG-PON: 2048
Service flows per PON board	16376	16368	16352
Maximum number of MAC addresses	131072	131072	131072
Maximum distance difference between 2 ONUs under the same PON port (board capability)	40 km	40 km	40 km
Supported ONU rates	10G/2.5G (downstream rate/upstream rate)	GPON: 2.5G/1.25G (downstream rate/upstream rate)	GPON: 2.5G/1.25G (downstream rate/upstream rate)
		XG-PON: 10G/2.5G (downstream rate/upstream rate)	XG-PON: 10G/2.5G (downstream rate/upstream rate)