T-VIPS CP560, User Manual

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122 WEB Interface
CP560 DVB-T2 Gateway User’s Manual Rev. 2.2 (3686) ID: um_t2gateway
T2-Profile
Select which T2-Profile to use. The standard profile is T2-Base, while T2-Lite has been
introduced in T2 version 1.3.1. T2-Lite is intended for mobile applications. The T2-Base-
Lite option is the intersection between T2-Base and T2-Lite, i.e. a signal that is valid for
both T2-Base and T2-Lite profiles. The T2-Base-Lite profile will be signalled as a normal
T2-Base signal, but with the T2_BASE_LITE flag set in the L1-Pre signaling.
Bandwidth
This field allows the setting of the bandwidth of the transmission channel. Possible values
are 1.7MHz, 5MHz, 6MHz, 7MHz, 8MHz, 10MHz. 10 Mhz is only intended for test
applications.
Cell ID
This field identifies a geographic cell in a DVB-T2 network.
Network ID
This field identifies the current DVB-T2 network.
T2 System ID
This field identifies the DVB-T2 system within the DVB-T2 network.
T2 version
This field selects the version of the DVB-T2 specification. Changing from version 1.1.1 to
1.2.1 or 1.3.1 makes the CP560 signal High Efficiency and Normal Mode in the L1-signalling.
It also gives a different selection of PAPR techniques.
The following settings define the structure of the T2-Frame.
Preamble format
The preamble is a DVB-T2 preamble that indicates whether the P2 part should be transmit-
ted in MISO (Multiple Input Single Output) or SISO (Single Input Single Output)format.
Extended carrier mode
The extended carrier mode allows an optimum use of the channel bandwidth together
with the higher FFT sizes (supported for 8K, 16K and 32K FFT).
FFT size
This field indicates the nominal FFT size of the symbols. Possible values are 1K, 2K, 4K,
8K, 16K, 32K.
Guard interval
Guard intervals are used to ensure that distinct transmissions do not interfere with one
another. It can be seen as a hard limit to the channel extent that can be tolerated by the
system. The choice of the guard interval requires consideration of the FFT size.
PAPR reduction
Two Peak-to-average power ratio (PAPR) reduction techniques are supported in DVB-T2:
• for DVB-T2 version 1.1.1 supported techniques are Active Constellation Extension
(ACE) and Tone Reservation (TR). The two techniques are not mutually exclusive
and a combination of them can be used.