User's Manual

XGS-PON FGW User Manual
20
Technical Description
Q_PPS_DM_018_V1.3
Figure 5: Optical fiber multi-service user access
In the upstream direction, the XGS-PON Fiber Gateway equipment is connected to the optical splitter
and respectively to the an OLT XGS-PON port through the CEx element to provide integrated access
services through the service headend.
In the downstream direction, the XGS-PON Fiber Gateway equipment is connected to various terminals
through the following LAN-side ports to implement multi-play services:
• Four 10/100/1000M Base-T Ethernet ports, which can be connected to terminals such as PCs,
STBs, and video phones to provide the high-speed data and video services;
• One 1/10GE BASE-X/T
• One/two FXS port, which can be connected to telephone sets to provide VoIP services;
• Four Wi-Fi antennas, which can connect to Wi-Fi terminals wirelessly to provide a secure and
reliable high-speed wireless network;
• One USB port, which can be connected to a USB storage device to provide convenient storage
and file sharing services within a home network;
The communication between client Fiber Gateway equipment (ONU/ONT) and the ISP access routers
(MAN edge) is made by an optical fiber-based passive architecture (ITU-T G.9807.1). The PON network
acts as a Layer 2 Ethernet metropolitan network. Access network assures and controls the media (MAC)
communication through a TDMA scheme, introducing XGEM (XGS-PON Encapsulation Method) in
between to adapt TDM layer to Ethernet.
The used protocol stack is shown in Figure 6.
Figure 6: Stack of protocols for PON architecture
Several transmission containers (T-CONT) are assigned to each user. Each T-CONT has an associated
XGEM port and each XGEM port has a VLAN identifier and an 802.1p priority level.