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TechNotes-Understanding and Configuring XG(S)-PON Combo 02

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Understanding and Configuring XG(S)-PON Combo

Understanding and Configuring XG(S)-PON Combo

XG(S)-PON Combo is a hybrid PON access solution developed by Huawei for GPON and XG(S)-PON. It implements smooth network evolution through XG(S)-PON Combo service boards.

Network Evolution Overview

For the GPON network that has been deployed on the live network, XG(S)-PON can smoothly evolve from the GPON network to the XG(S)-PON network.

Why Is Smooth Evolution Required?

The smooth evolution from the GPON network to the XG(S)-PON network is mainly due to the following reasons:
  • With the development of services, the bandwidth requirement of users is gradually increasing. In the short term, only some users need to be upgraded to the XG(S)-PON network, and some users continue to use the GPON network.
  • For a PON network that has been deployed on the live network of a carrier, it is costly to directly cut over the GPON network to the XG(S)-PON network. The evolution from GPON to XG(S)-PON must be completed through smooth evolution.

What are the conditions for smooth evolution from GPON to XG(S)-PON?

XG(S)-PON has the following features to support smooth evolution from a GPON network to a XG(S)-PON network:
  • The XG(S)-PON wavelength planning does not overlap the GPON wavelength planning. Therefore, the GPON and XG(S)-PON share the ODN network in the wavelength division multiplexing mode.
  • The OLT platform supports coexistence of GPON service boards and XG(S)-PON service boards.
  • XG(S)-PON and GPON have the same service provisioning and service deployment operations. They can share the NMS and service provisioning system.

No Wavelength Overlap Between GPON and XG(S)-PON

Figure 1-1 shows the wavelength distribution of GPON and XG(S)-PON.
Figure 1-1 The Wavelength Distribution of GPON and XG(S)-PON

XG(S)-PON Can Co-exists with GPON in the Same ODN

Figure 1-2 shows the GPON and XG(S)-PON can coexist in the same ODN with wavelength division multiplexing (WDM) mode.
Figure 1-2 XG(S)-PON Can Co-exists with GPON in the Same ODN
NOTE:

WDM: Wavelength-Division Multiplexing

What Is XG(S)-PON Combo?

The PON Combo supports two PON technologies through a combo port. One PON Combo port supports multiple types of ONUs at the same time, implementing hybrid network construction of GPON and XG(S)-PON and smooth evolution from GPON to XG(S)-PON.

Huawei PON Combo provides two types: XG-PON Combo and XGS-PON Combo.

  • XG-PON Combo:
    • XG-PON Combo means that GPON and XG-PON are integrated into one port through Combo.
    • The XG-PON Combo supports the access of GPON ONUs and XG-PON ONU.
  • XGS-PON Combo:
    • XGS-PON Combo means that GPON and XGS-PON are integrated into one port through Combo.
    • The XGS-PON Combo supports GPON ONU, XG-PON ONU, and XGS-PON ONU.
    NOTE:

    In this document, XG-PON Combo and XGS-PON Combo are short for XG(S)-PON Combo.

XG(S)-PON Combo Working Principle

Figure 1-3 shows the working principle of the XG(S)-PON combo service board.
Figure 1-3 Working Principle of the XG(S)-PON Combo Service Board
Working Principle:
  • The XG(S)-PON combo board works with the XG(S)-PON combo optical module to implement a combo port working in GPON mode and XG(S)-PON mode at the same time.
  • The XG(S)-PON combo optical module integrates the GPON optical module, XG(S)-PON optical module, and WDM multiplexer to share ODN resources without adding an external WDM multiplexer.
    • In the upstream direction: After the upstream signal of the ONU enters the XG(S)-PON combo port, the WDM determines whether the signal is a GPON signal or a XG(S)-PON signal according to the wavelength, and then sends the signal to the corresponding channel for processing.
    • In the downstream direction: After the downstream signal is sent from the OLT XG(S)-PON combo port, the GPON ONU and the XG(S)-PON ONU select the wavelength through the internal wavelength filter to receive the signal.

XG(S)-PON Combo Evolution Solution

This solution introduction smooth evolution from the GPON network to the XG(S)-PON network by adding the XG(S)-PON Combo Service Board.

Before Evolution

Figure 1-4 shows the GPON FTTx network, the OLT uses the GPON service board to connect to the GPON ONU before the evolution.
Figure 1-4 GPON FTTx Network

Evolution Solution

Figure 1-5 shows the smooth evolution from the GPON network to the XG(S)-PON network by adding adding the XG(S)-PON Combo Service Board.
Figure 1-5 Evolution Solution
NOTE:

XG(S)-PON is short for XG-PON and XGS-PON.

Operation Procedure

  1. Add XG(S)-PON Combo service board.
    NOTE:
    • If the OLT slot on the live network supports only 10 Gbit/s switching capacity and cannot meet the forwarding requirements of XG(S)-PON service boards, replace the subrack.
    • If the upstream port of the OLT supports only GE upstream bandwidth, it is recommended that you replace the upstream port with 10GE upstream bandwidth or even larger bandwidth to prevent the upstream port from becoming a bottleneck.
  2. Migrate the backbone optical fiber of the GPON port to the XG(S)-PON combo port.
  3. Add a XG(S)-PON ONU or replace a GPON ONU.
    NOTE:
    • The XG-PON Combo optical module can be connected to GPON ONU and XG-PON ONU.
    • The XGS-PON Combo optical module can be connected to GPON ONU, XG-PON ONU and XGS-PON ONU.
  4. After the GPON ONU is replaced with the XG(S)-PON ONU, the evolution is complete.

XG(S)-PON Combo Configuration Guide

Figure 1 shows the process of configuring the XG(S)-PON Combo service. After the XG(S)-PON Combo mode is configured, you can configure the service according to the configuration cases in the corresponding scenario.

Figure 1-6 XG(S)-PON Combo Service Configuration Process

Configuration Procedure

  1. Set the combo mode of a XG(S)-PON Combo port.

    On the OLT, run the port combo-mode { all | portid } { auto | wdm } command to set the combo mode of a XG(S)-PON Combo port.

    NOTE:
    • auto: sets the combo mode of a XG(S)-PON Combo PON port to auto.
    • wdm: sets the combo mode of a XG(S)-PON Combo PON port to wdm.
    • The XG(S)-PON Combo port mode must be the same as that of the XG(S)-PON Combo optical module.
    For example, set the combo port 0/1/0 to the auto mode.
    huawei(config-if-gpon-0/1)#port combo-mode                           
    { all<K>|portid<U><0,15> }:0                                                                                        
    { auto<K>|wdm<K> }:auto
  1. XG(S)-PON Combo Service Configuration.
    NOTE:

    After the GPON is switched to the XG(S)-PON, pay attention to the following points:

    • If the GPON ONU is not replaced after the evolution, the GPON ONU configuration remains unchanged.
    • If GPON ONU is replaced with XG-PON ONU or XGS-PON ONU after the evolution, delete GPON ONU and configure XG-PON ONU or XGS-PON ONU.

Reference Standards and Protocols

The following lists standards and protocols:

  • ITU-T G.987: ITU-T Recommendation G.987 (2010), G.987 definitions, abbreviations and acronyms
  • ITU-T G.987.1: ITU-T Recommendation G.987.1 (2009), 10 Gigabit-capable Passive Optical Network (XG-PON): General Requirements
  • ITU-T G.987.2: ITU-T Recommendation G.987.2 (2009), 10 Gigabit-capable Passive Optical Network (XG-PON): Physical Media Dependent (PMD) layer specification
  • ITU-T G.987.3: XG-PON TC Layer Specification
  • ITU-T G.987.4: XG-PON Reach Extension Specification
  • ITU-T G.988: ITU-T Recommendation G.988 (2010), ONU management and control interface specification (OMCI)
  • ITU-T G.9807.1: ITU-T Recommendation G.9807.1 (2016), 10-Gigabit-capable symmetric passive optical network (XGS-PON)
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Updated: 2019-09-19

Document ID: EDOC1100086825

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