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EchoLife ONT FAQ 04

This document provides principle-related and operation-related FAQs of Huawei EchoLife ONT (HG8240, HG8240w, HG8245, HG8247, HG8247H and so on).
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How to Resolve Incompatibility Between GPON and XG-PON ONTs When They Share the Same ODN?

How to Resolve Incompatibility Between GPON and XG-PON ONTs When They Share the Same ODN?

Answer

Compatibility between GPON and XG-PON ONTs:

Table 51-1 describes the Tx and Rx wavelengths of GPON an XG-PON ONTs.

Table 51-1 Tx and Rx wavelengths

Type

Downstream Direction

Upstream Direction

GPON

Center wavelength: 1490 mm

Wavelength range: 1480-1500 mm

Center wavelength: 1310 mm

Wavelength range: 1290-1330 mm

XG-PON

Center wavelength: 1577 mm

Wavelength range: 1575-1580 mm

Center wavelength: 1270 mm

Wavelength range: 1260-1280 mm

From wavelengths of XG-PON (asymmetric system with upstream rate 2.5 Gbit/s and downstream rate 10 Gbit/s) and GPON ONTs, if they share the same ODN, GPON ONTs (Table 51-2 lists compatibility) in the earlier stage require wavelength block filter (WBF) for downstream isolation because they are in poor performance in downstream optical signal isolation from XG-PON ONTs. Otherwise, packet loss or even disconnection may occur caused by signal interference. Therefore, the WBF needs to be added on the ONT or optical splitter.

Solution

The WBF is added on the optical splitter for GPON ONTs that are incompatible with XG-PON ONTs sharing the same ODN. Specifically,

  • Male and female connectors.
  • Can be externally connected to the SC/UPC (Shown in the following figure) or AC/APC connector.
Figure 51-1 SC/UPC connector

Figure 51-2 and Figure 51-3 show specific solutions for live networks.

Figure 51-2 ONTs of different types are connected to the same optical splitter

Figure 51-3 Only early-stage GPON ONTs are connected to the same optical splitter

Table 51-2 lists compatibility between GPON ONTs and XG-PON ONTs.

NOTE:
  • The time in Compatibility is calculated from the ONT replacement. Detailed markets and BOM codes needed to be queried.
  • For details, collect the ONT SN and provide it to the Huawei technical support engineer for querying.
Table 51-2 Compatibility between GPON ONTs and XG-PON ONTs

Model

Compatibility

HG810/HG810A/HG850

Supported from the delivery in June 2012.

HG865/HG866

Supported from the delivery in January 2011.

HG851/OT550

Not supported.

HG813/HG850A/HG851A

Supported from the delivery in June 2011.

HG860/HG861

Supported from the delivery in January 2011.

HG863

Replaced from June 2010.

HG8240/HG8240B/HG8240R/HG8240S/HG8240T/HG8240W/HG8245

/HG8245T/HG8010/HG8110/HG8247/HG8247A/HG8447

/HG8120/HG8120R/HG8242/HG8242B/HG8040/HG8247T/HG8045

/HG8244T

Replaced from June 2010.

HG8010A/HG8010H/HG8010U/HG8245A/HG8245H/HG8110H/HG8240A

/HG8240H/HG8240S/HG8240T/HG8240u/HG8045A/HG8012H/HG8247H

/HG8242H/HG8040H/HG8045H/HG8045D/HG8245D/HG8245V/HG8245W5

Supported by all models.

Updated: 2019-05-23

Document ID: EDOC1100009117

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