GPON : Provides asymmetric bandwidth (2.5 Gbps downstream, 1.25 Gbps upstream) and supports up to 128 ONUs per PON port.
XGS-PON : Provides symmetric bandwidth (10 Gbps upstream and downstream) and supports up to 256 ONUs per PON port.
ODN Compatibility :
XGS-PON operates over the same ODN (Optical Distribution Network) as GPON, meaning no changes are required to the existing fiber infrastructure.
XGS-PON uses different wavelengths (1577 nm downstream, 1270 nm upstream) to coexist with GPON on the same ODN using wavelength division multiplexing (WDM).
Why TRUE?
XGS-PON supports higher bandwidth and more users while maintaining compatibility with the existing GPON ODN architecture.
Thus, the correct answer is A .
References:
HCIA Huawei ACCESS Official Documentation , Chapter: GPON vs. XGS-PON.
ITU-T G.9807.1 Standards for XGS-PON .
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