Rain Fade Diversity Link System

Many of the new High Throughput Satellites (HTS) operate at Ka-Band which is very susceptible to weather conditions.

ViaLite‘s Rain Fade Diversity system (L-Band HTS 700-2450 MHz) allows signals to be taken from an antenna located at a geographically diverse location where the weather is better within the satellite’s footprint – typically 50-100 km away. This is done without disruption of the data feed and with timing compensation to ensure continuity of service for the user.

  • Rain fade solution for switching between teleports
  • Ideal for 500 MHz and 800 MHz bandwidths used in High Throughput Satellites (HTS) – also full 700-2450 MHz capability
  • Complete end-to-end system design
  • Full system testing over required distance prior to shipment
  • Time delay compensation between teleports
  • DWDM allowing 4-96 links per strand of fiber
  • LNB/BUC power and on-module LNB switching options
  • DWDM 10MHz Reference and SNMP/Ethernet available
  • Extreme temperature operation
  • True Plug and Play
  • Complete range of DWDM complementary products available
  • 5-year warranty as standard

You may also be interested in the Long Distance DWDM Link System.

 

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Rain Fade Diversity Link System

Ultra-wide dynamic range

One of the system’s key features is the ultra-wide dynamic range. This allows wider bandwidths to be transmitted including the entire 700-2450 MHz.  For High Throughput Satellites (HTS), typical bandwidths are 500 and 800 MHz. Demand for increased capacity in satellite communication continues to drive the industry to use HTS at these higher frequencies, such as Ka-Band, which is particularly susceptible to rain fade.

Due to the complexity of these systems, ViaLite offers system design and installation assistance. Please contact us for details.

 

Manned from a single control room

ViaLiteHD long distance links can also be controlled remotely using SNMP or Ethernet. This means multiple, unmanned teleport sites can be manned from a single control room, opening up new possibilities for teleport design.

 

DWDM – 96 links per fiber

The optional use of Dense Wave Division Multiplexing (DWDM) allows up to 96 links to be sent along a single fiber.  These can be setup for short interfacility links (IFLs), as well as over long distances. The DWDM massively reduces the fiber count, minimizing fiber leasing/operational costs.  DWDM requires the use of multiplexers, amplifiers and dispersion compensation.

Hardware formats

The Rain Fade Diversity Link System is available in a couple of formats:

– Single rack chassis card / Dual rack chassis card (Rx/Rx, Tx/Tx or Rx/Tx)*

A fully populated 19” 3U ViaLiteHD rack chassis supports up to 26 links and accepts 13 RF cards, plus an SNMP card and dual power supply modules.  A 1U chassis accepts three RF cards or two RF cards with an SNMP card.

*Transmitters only available as single rack chassis cards.

– Yellow OEM Link

The Yellow OEM Link has been designed for system integrators and equipment manufacturers to build the link into their own designs.

A range of support modules and accessories is also available, including indoor rack chassis units and weatherproof outdoor enclosures.

See our hardware formats guide for more information.

 

Options include:

  • 50Ω electrical connectors: SMA, MCX (only available on OEM modules) or BNC
  • 75Ω electrical connectors: BNC, MCX (only available on OEM modules) or F-type
  • Optical connectors: SC/APC, FC/APC or E2000/APC
  • Test ports on Tx & Rx modules
  • LNB powering through RF connection
  • Optional blind mate connectivity
  • LNB control circuit with 13/18VDC & 22kHz tone.

RF Performance Characteristics

 L-Band HTS link (50Ω)L-Band HTS link (75Ω)
Frequency range700-2450MHz700-2450MHz
Impedance, RF connector50Ω SMA, blind mate75Ω BNC, blind mate
VSWR1:1.5(typ)1:1.5(typ)
Link gain (TX gain / RX gain)+15 (-5 / +20) a h +4 (-11 / +15) a h
Flatness (full band, 100km, no DCF)±0.5dB (typ) a h ±0.6dB (typ) a h
Gain stability0.25 @ 24hrs dB (typ)0.25 @ 24hrs dB (typ)
P1dB input+1.5dBm (typ) a k 0dBm (typ) a k
IP3 input+13.5dBm (typ) a k h +13.5dBm (typ) a k h
Noise figure (default gain)14dB (typ) a h 23dB (typ) a h
SFDR 114dB/Hz ⅔ (typ) a 114dB/Hz ⅔ (typ) a
Max RF input power without damage15dBm15dBm

a nominal input power @ 0dB optical loss
h default gain setting
k measured @ 1.2GHz

 

Optical Performance Characteristics

 L-Band HTS link
Laser typeHigh power distributed feedback (DFB) laser, thermo electric cooled
Optical wavelengthFull ITU, DWDM range of wavelengths are available
See manual for details
Optical power output10.8dBm (typ) - E laser
7dBm (typ) - D laser

 

Temperature Characteristics

 L-Band HTS link
Operating temperature-20degC to +70degC
Storage temperature-40degC to +85degC

L-Band HTS – 50 Ohm DWDM Medium Power (version HRx-Lx-DCxx-DS-1)
L-Band HTS – 50 Ohm DWDM High Power (version HRx-Lx-ECxx-DS-2)
Yellow OEM datasheet  (version HRx-xx-xN-1)
ViaLiteHD RF Link Handbook  (version HRx-HB-7)

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