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Tx and Rx wavelengths

Type	Downstream Direction	Upstream Direction
GPON	Center wavelength: 1490 nm Wavelength range: 1480-1500 nm	Center wavelength: 1310 nm Wavelength range: 1290-1330 nm
XG-PON	Center wavelength: 1577 nm Wavelength range: 1575-1580 nm	Center wavelength: 1270 nm Wavelength range: 1260-1280 nm

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.

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.

• The time in Compatibilityis 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.