WDM1r multiplexers can be deployed close to the CO or user as required.
B.
GPON and XGS-PON have different rates but the same network architecture. Therefore, to ensure that the device supports XGS-PON, you only need to change the optical modules on an ONU.
C.
The deployment of WDM1r multiplexers does not affect the calculation of optical link attenuation.
D.
Because the center wavelengths of XGS-PON and GPON are different and do not overlap or conflict with each other, they can share an optical distribution network (ODN).
Correct : WDM1r multiplexers can be flexibly deployed close to the Central Office (CO) or closer to the user, depending on network design requirements.
Option B :
Incorrect : While GPON and XGS-PON share the same ODN architecture, simply changing the optical modules on an ONU is insufficient to support XGS-PON. The ONU hardware and software must also be compatible with XGS-PON standards.
Option C :
Incorrect : The deployment of WDM1r multiplexers introduces additional optical loss, which must be accounted for in the calculation of optical link attenuation.
Option D :
Correct : GPON (1490 nm downstream, 1310 nm upstream) and XGS-PON (1577 nm downstream, 1270 nm upstream) use non-overlapping wavelengths, allowing them to coexist on the same ODN using WDM.
Thus, the incorrect statements are B and C .
References:
HCIA Huawei ACCESS Official Documentation , Chapter: GPON and XGS-PON Coexistence.
ITU-T G.9807.1 Standards for XGS-PON .
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