T-VIPS CP525 cMux, Руководство пользователя

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26 Functional Description
CP525 cMux User’s Manual Rev. 5.20.12 (3944) ID: um_tsmux
5.3 TS output
The CP525 can generate one MPEG output Transport Stream. When using ASI output, the
transport stream is presented on at least one ASI output port. In addition a number of ports
can be programmed to carry the same signal, as described in
Section 6.1.2 . In ATSC+DVB
configuration mode, SMPTE 310M output is also supported.
The output is always re-clocked, configuring a wanted bitrate for the output multiplex.
The output transport stream can also be transmitted on either of the Ethernet data interfaces,
or on the SFP connector. These functions are enabled with two different licence keys, one for
Ethernet data transport, and another for the SFP module.
5.4 Input switching
The CP525 supports combination of several inputs into a prioritized order switching group,
where the highest priority source that has sync and no critical alarms, is automatically selected
as the source of program data and PSI/SI/PSIP data.
The input switch is itself modelled as an input, so once defined, it can be referred to as the
source of programs and PSI/SI/PSIP data when building up the output multiplex. A sync loss
on the currently selected source will cause immediate switching to an alternative input in the
switching group.
The signals on each of the inputs in a switching group, can be identical or different. Fastest
switching times are achieved when the signals are identical with respect to PIDs and services.
The input switching function can be used on both ASI sources and IP sources, or any combina-
tions of these. Signal loss detection on IP sources is slower than for ASI sources.
Sources that are members of a switching group cannot be referred to directly.
The input switching function is protected by a SW licence key.
5.5 Optional SFN adapter
The product may be fitted with an SFN adapter. This adapter enables synchronisation of the
output clock to a 1 PPS signal for operation in SFN networks. The 1 PPS signal can either be
taken from the internal GPS receiver, or from an external source.
When the SFN adapter is installed, the unit may be configured to insert MIP frames.
5.6 Video over IP
5.6.1 Input and output
The CP525 supports MPEG transport streams over IP, the functionality is protected with a
separate SW licence.
IP inputs are defined dynamically on need, up to a maximum number that is 16 at the time
of writing. Once the IP inputs are defined, they are modelled to have the same functionality
as the ASI input ports, and content received will be available to the multiplexer generating the