This is the OFDM modulator for the relay station at ISDB-T Digital Terrestrial Broadcasting system. It is used with the system of the TS transmission scheme.
JIS rack mounting type
External size: 480(W) x 99(H) x 500(D)mm (Excluding protrusions)
Mass: 10kg or less
| Input part | ||
| ASI Input | Number of input | 1port |
| Electrical interface | DVB-ASI conforming, 75Ω | |
| Data transmission speed |
4 x 512 / 63Mbps | |
| Data format | Broadcasting TS (The ARIB-STD B31 1.5 edition Appendix Chapter 5 conforming) | |
| Connector | BNC type | |
| Frame sync input | Number of input | 1port |
| Electrical interface | 1.0Vp-p, 75Ω | |
| Timing | At the first packet of input broadcasting TS frame, it goes to LOW. At the others, it goes to HIGH. | |
| Connector | BNC type | |
| 512 / 63MHz CLK input |
Number of input | 1port |
| Electrical interface | 0.8Vp-p, 75Ω | |
| Connector | BNC type | |
| 10MHz input | Number of input | 1port |
| Electrical interface | 0dBm±6dBor less, 50Ω | |
| Connector | BNC type | |
| 1pps input | Number of input | 1port |
| Electrical interface | TTL level, 50Ω | |
| Connector | BNC type | |
| AC input (Auxiliary Channel) |
Number of input | 1port |
| Electrical interface | LVDS | |
| Connector | D-sub 15S #4-40 Screw type | |
| Output part | ||
| IF output | Number of output | 3 ports |
| Center frequency | 37.15MHz | |
| Output level | -10dBm | |
| Impedance | 50Ω | |
| Connector | BNC type | |
| IF monitor output | Number of output | 1 port |
| Center frequency | 37.15MHz | |
| Output level | -20dBm | |
| Impedance | 50Ω | |
| Connector | BNC type | |
| 512 / 63MHz CLK output |
Number of output | 1 port |
| Electrical interface | TTL level, 50Ω | |
| Connector | BNC type | |
| Modulation digital monitor (Base band monitor) |
Number of output | 1 port |
| Center frequency | 8.126984MHz (512 / 63MHz) | |
| Output level | -10dBm | |
| Impedance | 50Ω | |
| Connector | BNC type | |
| IF local monitor | Number of output | 1 port |
| Center frequency | 45.276984MHz(37.15MHz + 512 / 63MHz) | |
| Output level | -10dBm | |
| Impedance | 50Ω | |
| Connector | BNC type | |
| Transmission channel coding processing part | ||
| OFDM modulation part | Transfer mode | Mode2, Mode3 |
| Carrier spacing | 1.9841kHz, 0.992kHz | |
| Carrier modulation scheme |
QPSK, 16QAM, 64QAM | |
| Guard interval ratios | 1/4, 1/8, 1/16 | |
| Number of frequency segments |
13 segments | |
| Number of hierarchical layers |
Three or less (for partial reception) |
|
| Transmission channel coding |
Frequency interleaving | Inter-segment interleaving and Intra-segment interleaving. |
| Time interleaving | Mode2 (0, 2, 4, 8), Mode3 (0, 1, 2, 4) |
|
| Inner code | Convolutional code Code rate (1/2, 2/3, 3/4, 5/6, 7/8) |
|
| Byte interleaving | Convolutional byte interleaving (Depth=12) | |
| Energy dispersal | G(x) = X15 + X14 + 1 | |
| Outer code | Shortening Reed-Solomon codes (204, 188) | |
| TMCC coding | Carrier modulation scheme |
DBPSK |
| Error correction | Shortenened code(184, 102) of the difference cyclic code (273, 191) | |
| Alarm monitoring / control interface | ||
| Network interface | Number of port | 1 port |
| Protocol | TCP / IP | |
| Interface | IEEE802.3 / Ethernet conforming10Base-T (RJ-45) | |
| RS-232C | Number of port | 1 port |
| Protocol | RS-232C Start-stop synchronization | |
| Connector | D-sub9P #4-40 screw type | |
| Alarm monitoring output 1 |
Number of port | 1 port |
| Electrical interface | Non-voltage contact outputContact ratingDC24V, 0.1A or less | |
| Connector | D-sub25S M2.6 screw type | |
| Alarm output | Make, when abnormal | |
| TS abnormal | Output, either when the synchronized signal of broadcasting TS, or the number of packets of A, B, and C hierarchy is abnormal. | |
| Mode abnormal | Output, either when IIP packet is abnormal, the CRC error system identification of MCCI is abnormal (excluding 00.), CRC of NSI is error, W0/W1 is discontinuity, 1pps signal input doesn't exist (voidable by the setting), or the length of the frame is abnormal. | |
| Standard CLK abnormal | Output, when PLL is unlocks. | |
| Frame sync abnormal | Output, either when frame synchronous signal doesn't exist, or frame_head_packet_flag is abnormal. | |
| Output level abnormal | Output, when the output level is below ratings (-6dB). | |
| Logic abnormal | Output, either when TS, mode, standard CLK, or frame sync is abnormal. | |
| Power failure | Output, When the regulator output voltage is -10% or less. | |
| FAN abnormal | Output, when FAN is stopping. | |
| Modulator abnormal | Output, either when logic, power supply or FAN is abnormal. | |
| External 10MHz abnormal |
Output, when the reference input level is below ratings (-6dB). | |
| Remote/Local | Output, when local operation. | |
| SW alert | Output, when HOLD is released. | |
| Alarm monitoring output No.2 |
Number of port | 1 port |
| Electrical interface | Non-voltage contact outputContact ratingDC24V, 0.1A or less | |
| Connector | D-sub9S M2.6 screw type | |
| Alarm output | Make, when abnormal | |
| Modulator abnormal | same as “modulator abnormal “of alarm monitoring output No.1. | |
| Output level abnormal | Same as “Output level abnormal “of alarm monitoring output No.1. | |
| External 10MHz abnormal |
Same as “External 10MHz abnormal “of alarm monitoring output No.1. | |
| SW alert | Output, either when local operation or HOLD is released. | |
| Broadcasting stopping. | Output, either when ISDB-T information in dummy byte part of broadcasting TS signal is continuously ALL “0” or ALL “1”, or the synchronized signal (inspection at 204 byte cycle) of broadcasting TS signal is abnormal. | |
| Delay function | Delay setting resolution | 100ns |
| Control value | 20 to 224 | |
| Range of delay | 0 to 1 second | |
| Setting method | Automatic setting by NSI information or fixed value setting by front panel operation. | |
| IF output level change | Within ±0.5dB of rated power |
| Out-of-band spurious | -63dBc or less against the average output (IM is excluded). |
| IM | -56dB or less |
| Phase noise | -56dBc or less |
| Power supply voltage | DC +48V±15% or less | |
| Power consumption | 70W | |
| Environmental requirements | Temperature | -10°C to 45°C (Forced air cooling) |
| Humidity | 45% to 90%RH (Without dew.) | |
This is the OFDM modulator of IF output for a system of the TS transmission scheme. It is used with the system of the TS transmission scheme.
It corresponds to MCCI of IIP (transmission control signal) and NSI (signal for the network synchronization) that is multiplied to broadcasting TS Signal provided for by standard ARIB STD-B31 Appendix Chapter 5.
The transmission parameter of the OFDM modulator is set by MCCI automatically. Moreover, the parameter setting by the manual operation is also possible.
Because the delaying circuit for SFN is built into, the amount of the delay can be set by Static_Delay_flag of NSI and, the amount of the delay can be set by the manual operation. It corresponds to input of dummy byte of broadcasting TS or AC data by invalid hierarchy.
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