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Digital Fiber optical BDA

The digital fiber optical BDA adopts software radio technology, digital filtering technology and digital transmission technology to overcome the shortcomings of analog fiber optic transmission limited by distance and meet the requirements of large dynamic and low noise required for long-distance transmission.It designed to provide bidirectional communication between terminals and base stations across various environments, including tunnels, buildings, subways, as well as outdoor areas such as stadiums, rural, and dense urban areas. Boasting excellent compatibility, it is widely utilized in trunking communication systems like TETRA, DMR, and APCO25, as well as conventional communication systems. These repeaters enhance the coverage and performance of two-way radio systems, ensuring reliable communication with advanced technology and robust construction. It provides exceptional signal clarity and extended range, making it the perfect solution for professional and industrial communication needs.

Classification:

Public Safety Trunking System

Key words:

Complete Equipment Series

Active Module Series

Passive Device Series

Antenna Series

Related Products

Product Description

Overview:

The Digital optical fiber BDA system consists of the near end unit (DMU) and the DRU (DRU)。

The digital optical fiber BDA system converts the radio frequency signal to the digital signal and then transmits the digital optical signal. The digital signal processing method is used to realize the unified module of the optical module, the bottom noise module and the frequency conversion module related functional components of the analog optical fiber system. Compared with the analog optical fiber system, the module has the advantages of the simplification of the internal module, the simple walking line, the small parasitic frequency interference and the light weight. The optical loss between DMU (Master Hub Unit) and DRU (Remote Radio Unit) is compensated by digital way, which is better than analog fiber BDA to improve system efficiency.

Product Features:

(1).The system adopts the transmission interface conforming to the CPRI standard, and adopts digital technology. The radio frequency does not decay with the attenuation of the optical signal, and the dynamic range remains unchanged during the long distance and multi-path transmission. The digital transmission is less affected by the dispersion of the light. In the short distance of transmission, multimode optical fiber transmission can be used to reduce the cost.

(2).Digital IF technology is used to digitize RF signals and process digital signals in digital domain, which greatly enhances the equipment's ability to process and control signals.

(3).It can support multiple carriers and use high-speed FPGA to track, process and filter each carrier and each time slot of the signal to meet the requirements of noise suppression. The delay of digital transmission can be calculated and corrected to ensure no multipath interference and reduce noise interference to the base station.

(4).Multi-form networking mode: parallel mode, series mode, series-parallel combination mode, ring network mode, one master unit can carry up to 64 remote units.

(5).With a powerful monitoring system, users can monitor and control the operation status of repeaters (including gain, power, alarm and other parameters) in a variety of ways (USB, 4G, Ethernet or WEB) in real time, and can timely and accurately handle exceptions according to the detection results of the system.

(6).All nameplates are laser engraved, beautiful, clear and not easy to wear.

(7).The product categories are complete and can be customized according to the special requirements of customers.

Technical Specifications:

Classification	Item	Technical specifications
Optical characteristics	Wavelength	1310nm and 1550nm
	Optical output power	-9dBm～-3dBm Optical output power tolerance power rating ±1dB
	Dynamic range of optical fiber transmission attenuation	≥15dB, A product description of the sensitivity and optimal receiving power of light receiving is also required.
	Connector Type	LC/UPC or Customizing
	Connector Number	4/Donor 2/Remote
	Digital optical fiber networking ability	At least support 6 level chain networking and 4 ports star type networking
		Maximum allowable optical loss≥20dB
		Maximum fiber distance: support 20KM long distance
	Optical loop function	Support
RF characteristics	Working frequency	130 - 174MHz(VHF),300 - 520MHz(UHF),806-870Mhz
	Maximum output power and power tolerance	Downlink：33,37,40.43,46, ± 1dBm (optional)
	Maximum output power and power tolerance	Uplink：-5±1dBm
	ALC	Input power increase 20dB，output power keep within the maximum output power +2dB
	Rated gain and tolerance value	Downlink：Gmax=45dB±1.5dB(Cable Coupler Type) Gmax=95dB±1.5dB(Air Coupler Type)
	Rated gain and tolerance value	Uplink：Gmax=45dB±1.dB(Cable Coupler Type) Gmax=90dB±1.5dB(Air Coupler Type)
	Gain adjust range	＞30dB
	Gain regulation step size and error	Gain regulation step≤2dB；Error：±1dB/(1-10dB), ±1dB/(10-20dB), ±1.5dB/(≥20dB)
	Pass band Ripple	≤3dB(P-P)/ Within Effective working band ;≤2dB(P-P)/Within channel
	Intermodulation attenuation	≤-50dBc
	Uplink noise figure	NF≤5dB
	Transmission delay	stand-alone≤9μs
		Time delay compensation range：≥ 100μs Have automatic and manual compensation function
		Time delay correction step length：≤1μs；
		Compensation precision of time delay correction： ±3us
	VSWR	≤1.5
	Maximum RF Input(Non damage)	Uplink：-50dBm (DRU input port)
	Maximum RF Input(Non damage)	Downlink：-50dBm (DAU Input port)
Mechanical and environmental characteristics	RF connector	N-F
	RF impedance	50Ω
	Power supply	DMU：DC24V or DC48V or AC220V or AC110V
	Power supply	DRU：DC24V or DC48V or AC220V or AC110V
	Power supply consumption	£50W typical (DMU) (Cable Coupler Type) £120W typical (DMU) (Air Coupler Type) £80W typical (33dBm DRU) £110W typical (37dBm Slave) £150W typical (40dBm Slave) £200W typical (43dBm Slave) £250W typical (46dBm Slave)
	External dimensions	DMU：£482 x 325 x 50(mm) (Cable Coupler Type) DMU：£316 x 238 x 133(mm) (Air Coupler Type) DRU：£316 x 238 x 133 (33dBm) DRU：£370 x 335 x 134 (37dBm) DRU：£370 x 335 x 134 (40dBm) DRU：£469 x 379 x 139 (43dBm) DRU：£469 x 379 x 168 (46dBm)
	Weight	DMU：≤9(KG) (Cable Coupler Type) DMU：≤15(KG) (Air Coupler Type) DRU：£15 kg (33dBm Slave) DRU：£ 18 kg (37dBm Slave) DRU £ 25 kg (43dBm Slave) DRU £ 35 kg (46dBm Slave)
	Installation method	Rack-mounted or Wall hanging or holding pole
	Working temperature	-20℃～+55℃
	Relative humidity	≤95%
	Protection Level	DMU：IP30 , DRU：IP65
	Startup waiting time	180s
	Heat dissipation mode	Natural cooling
Monitoring function		Monitoring protocol: China Telecom protocol Local monitoring：USB ,RJ45 Remote monitoring： RJ45 network port (option SMS or 4G) Main monitoring functions: input output power detection, equipment temperature detection, VSWR detection, DMU/ DRUs gain regulation, optical link fault alarm, input output over power alarm, output under power alarm, etc.

Product Type:

Cable coupling type BDA, Air coupling type, redundant backup type Air and non-backup type Air , band selection type Air , frequency selection type Air , single system Air , dual system Air , multi-system Air , etc.