Description:
DTV server Crypton COD881MS – is a multifunctional server for pay-TV services. COD881MS is a perfect solution for converting analog signals into DVB digital stream. L-band (950-1750 MHz) signal at the output of built-in QPSK modulator by aid of frequency converter can be carried to a desired SHF frequency (for instance, into Ku-band for satellite broadcast systems or MITRIS).In arbitrary order COD881MS can scramble 8 digital TV-programs by aid of dynamic keys, which are unique for every program. Subscribers message system (SMS) allows having up to 16 million subscribers in aggregate for all of the eight channels. According to ETS-300468 specification COD881MS inserts PSI and SI information into the stream.
Control and status monitoring of COD881MS are performed by the operator's personal computer running "Crypton DTV Master" software. Communication media between server and computer is a regular TCP/IP network (100 BaseTX, UTP5 cable, RJ45 plug, can run directly and via active network equipment). There is no restriction in the quantity of network equipment.
Typical applications of COD881MS are head-end stations of digital cable, MITRIS, MMDS- and LMDS networks.
Scope:
- Eight analog inputs.
Video and stereo sound for each of the eight channels are converted into eight DVB-compliant streams (MPEG2 video, MPEG1 Layer2 audio). Then, each stream is multiplexed into one common DVB stream.
- Set of bitrate for video and sound.
A desirable bit rate can be set for every channel. Flexible setting allows to using frequency resource more effectively. Channels with dynamic image could be set at the high bit rate.
For the channels where still images are dominant a bit rate can be reduced without a significant decrease in quality.
- TV and radio channels.
Each channel could be set as a TV channel (video and stereo sound) or as a radio channel (stereo sound only).
- Channel disconnection (if required).
Any channel can be disconnected during the pre-check works (or for other reasons).
When channel is disconnected the stream will be fully removed from an aggregate output stream without affecting any other channel.
- Self-contained channels reset.
In order to maintain an operational status of device for a long period of time, it is required to have a mechanism that quickly eliminates the possible defects.
Any of eight MPEG encoders can be reset and reloaded in accordance with the channel settings within a short period of time.
- DVB-compatible scrambler.
The scrambler is a realization of Common Scrambler Algorithm, described in DVB-CAS ETR-289 specification.
- L-band QPSK modulator.
Frequency tolerance is ±5 kHz, 50-Ohm output.
- TCP/IP network.
Connection between COD881MS and operator's control computer is done via regular TCP/IP network equipment.
- Reliable software. "Crypton DTV Master" software package allows controlling and monitoring the status of network devices in real time.
Design:
DTV server COD881MS – is housed in a compact Multipac design with built-in power supply. Easily assembled into 19" rack. Dimensions: height – 2U (89mm), depth – 295 mm, width – 483 mm.Technical characteristics of DTV server COD881MS:
- Quantity: 8
- Formats: PAL/SECAM
- Analog interface: composite (CVBS)
- 10 bit A/D
- Voltage at the input: 0,1 – 1V
- Automatic gain setting
- Connector: BNC
- 8 stereo channels (analog)
- Voltage at the input: 0,1 – 1V
- Connector: RCA
- TV, radio, disconnected
- MPEG-2 4:2:0 P@ML
- Bit rate: 3, 4, 5, 6 Mbit/sec (CBR), 4 Mbit/sec (VBR)
- MPEG I Layer II
- Sampling rate: 44.1 KHz
- Bit rate: 64, 128, 192, 224, 256, 384 Kbps
- PSI/SI tables insertion according to ETS-300468
- DVB SI tables:
-
SDT – program description table
ECM – conditional access information - PSI MPEG-2 tables:
-
PAT – programs table
PMT – program content table
- Multiplex up to 8 DVB transport streams
- PID assignment
- Built-in DVB-compatible scrambler
- Conditional Access System: "Crypton" complies with ETR-289, DVB Simulcrypt
- Maximum quantity of programs being scrambled: 8
- QPSK modulation: corresponds to EN 300421
- Input stream rate: 1 - 50 Mbps
- Symbol rate: 25 - 30 (step - 0,125 Msymb/sec)
- Bandwidth: 950 - 1750 MHz (two subbands)
-
950 - 1500 MHz
1450 - 1750 MHz
- Frequency tolerance: ±5 kHz
- Frequency step: 1 Hz
- FEC Modes - 1/2, 2/3, 3/4, 5/6, 7/8
- Output resistance: 50 Ohm
- Connector: SMA
- Ethernet (TCP/IP)
- Software: "Crypton DTV Master"
- 2U(19")
- 93mm х 482,6mm х 336mm
- 3.65" х 19" x 13.25"
- 4,3 kg
- 90-260V AC 50/60 Hz
- Power consumption: 80 Watt max
- Temperature: 0 °С - +45 °С
- Humidity: 5% - 85% (non-condensing)
- Temperature: -40 °С - +70 °С
- Humidity: 0% - 85% (non-condensing)
-
Forced air circulation
Functional block diagram COD881MS:
Concise description of COD881MS units:
- MPEG Encoder.
MPEG encoder module converts analogue picture and sound signals into digital stream according to DVB specification.
- Multiplexer.
Eight generated digital channels are multiplexed into one aggregate stream at the 8-channel multiplexer module.
- DVB Scrambler.
The Scrambler used in COD 881MS is a DVB-compatible and it corresponds to DVB-CAS ETR 289 specification. It produces a random scrambling of DTV programs. The main purpose of scrambling is to exclude TV programs' unauthorized viewing. The stream is fed to the modulator at the output of the scrambler and then to the frequency converter, and at last to the subscriber's equipment: digital receiver with encoding system "Crypton" or TV-receiver.
- Service Information Generator.
Service Information Generator performs control messages insertion, so the receiver may decide what to do with the selected TV-channel.
- Control Module.
The Control Module is used for the following operational tasks: subscribers control, status information gathering, encoders control and so on.
- QPSK modulator.
Device is equipped with built-in QPSK modulator with carrier frequency that can be set in the range of 950-1750 MHz.