Televes 769503, User Manual

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2.1.3.2 IPTV service
For the IPTV service the ONT also behaves like a Layer 2 bridging device. For this service, the ONT has a specific GEM PORT for Multicast. This same
GEM PORT is requested by the user in order have access to the various IPTV channels. Every time a user request a new channel, the ONT will send
to OLT a IGMP packet requesting that Channel. The ONT is also responsible for implementing the snooping for the channels that the user requests.
2.1.3.3 RF Video Overlay
PON RF video overlay service is the way to deliver a broadcast TV service over a PON fiber network. This video overlay service is foreseen to provide
mainly broadcast video transmission in contrast to unicast and/or multicast IP video transmission which is used for IPTV and/or Video-On-Demand
having the need for a Set-Top-Box or a Smart TV at the customer premises.
Standardization bodies (ITU for GPON and IEEE for GEPON) have excluded the use of the 1550 -1560nm wavelength window for IP transmission on
PONs and have even continued with this approach for the upcoming 10GPON and 10GEPON standards. The 1550-1560nm wavelength window is
thus exclusively reserved for the video overlay transmission and by that mean an option to of¬foad unicast and/or multicast video transmission
from the IP PON transmission link.
Within the ONT RF Video Overlay feature implementation is also an option to deliver a flavoured TV channel pack service by the use of a group of
embeeded RF analog filters that can be remotely managed (NMS) in order to enable each individual commercial TV Channel pack, Figure 2-7.
Band pass filters for premium channel service
Remote configuration of the filters from the management system
RF Overlay Signal Spectrum
Base TV Channel Service Pack
Premium TV Channel Service Pack
PW
Hz
Figure 2-7: RF Overlay analog filter feature
Tipically an extra fiber testing signal (1650nm) for optical network probing is also added to the PON optical communication link.
2.1.3.4 Voice
ONT voice service provisioning could be made through OLT configurations over OMCI messages or could be downloaded (FTP) from the OLT up
to the ONT after the ONT registration on the PON network.The ONT bridging family equipments have the ability to deliver the Voice service over
two types of interface:
Logical interface (VLAN encapsulation)
If the ONT has no FXS ports and the VoIP service is transparently forwarded from the OLT up to the Home Gateway (and vice versa) within a pre-
viously defined voice VLAN. ONT respects the defined priority and implements the traffic encapsulation from its own Ethernet interface into a
specific T-CONT/GEM-Port over the PON interface and up to the OLT equipment.