BMS Truck-Coder II, Инструкция по установке и эксплуатации

Страница: 11 / 49

3
The FM modulator is designed to accept analog audio and video inputs. Support for 2 audio channels is
provided via frequency programmable sub carriers that ride above the video signal The frequency deviation
is user configurable to support operation in either a 17 MHz or 12 MHz channel allowing Analog operation
to continue after the channel plan transition is complete. Analog transmission offers a more graceful
degradation in performance and might be preferred under certain conditions.
The Digital (COFDM) modulator also supports 2 analog audio and one analog video input but also supports
advanced digital interfaces (ASI, SDI) as well. The digital modulator includes an MPEG2 encoder and a
DVB-T compliant COFDM modulator. Both MPEG and COFDM parameters are fully configurable by the
system controller in support of optimum performance and compatibility with other vendors equipment. For
those users less familiar with detailed COFDM and MPEG settings, the equipment provides 3 preset
robustness settings (low, mid and high) that each optimize video performance at the expense of modulation
complexity. High robustness provides the lowest quality video but is able to operate in severely
compromised locations. Low robustness provides the best quality video but may require a clear line of sight
shot.
An integrated SMPTE color bar generator with programmable text overlay is included. The indoor unit
features a menu driven VFD front panel display. Two levels of user access are supported; Operator and
Engineer. Operator is designed for non-technical users and assumes that the equipment has been
preconfigured by a station engineer. Engineer has full access to all menus and the ability to set up the
equipment for a less qualified operator.
The system accommodates up to 999 user programmable presets. These can be uniquely named and
configured; each preset records all of the configurable variables within the system. Presets 1 thru 6 are
conveniently displayed on their own screen for quick and easy recall. All presets can be uniquely named
via the front panel menu system to simplify identification and can be recalled quickly to put the equipment
in a known state. Presets are an ideal mechanism for the station engineer to pre-configure the equipment for
simplified operation by a less skilled operator.
The system also features a front and rear panel ethernet interface that can be conveniently used to upload
new operating firmware into the unit. This interface supports high data transfer rates and simplifies the
firmware upgrade process. This equipment makes extensive use of FPGA (field programmable gate array)
and microprocessor controlled hardware. Ease of firmware upgrade helps ensure that the equipment is
always kept up to date.
The TCII also includes embedded web based management that can be accessed with any PC using a web
browser and connected to the front or rear panel Ethernet port. This interface supports all the front panel
programmable features as well as others such as the ability to configure channel plans, and download
preconfigured presets (duplicate equipment setups). The system can be controlled remotely via an RS232
control port as well; consult BMS for the protocol specification for this port.