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2.1.3 Services
The ONT supports the following services:
Voice over IP (VoIP) service;
Broadband Internet Access:
High bit rate data for High Speed Internet service – HSI;
IPTV service;
Analog video service (RF Overlay);
Mobile Backhaul service.
2.1.3.1 Internet over GPON
GPON is a point-to-multipoint passive optical network, in which unpowered optical splitters are used to enable a single optical fiber to serve
multiple premises, typically 1-64.
A PON consists of an optical line terminal (OLT) at the central office and a number of optical network terminals (ONT) at the customer premises.
Downstream signals are broadcasted to all premises sharing multiple fibers. Encryption can prevent eavesdropping. Upstream signals are com-
bined using a multiple access protocol (Time Division Multiple Access - TDMA). The OLT queues data to the various ONT terminas in order to pro-
vide time slot assignments for upstream communication.
In Figure 2-4 it is shown a scenario for Internet service user access through an ISP network.
Figure 2-4: Optical fiber Internet service user access