Product ManualManual

The 7708LT is a fiber optic transmitter for RF signals in the extended L-Band or wider frequency range. It accepts a single RF input on coaxial cable and provides a single output for optical transmission. An RF monitor output provides a convenient means of obtaining peak satellite signal strength, or additional signal distribution.

Gain may be adjusted manually or managed automatically via AGC. With SmartMON™, incoming RF signal strength, LNB current, and other data are relayed over the fiber output for monitoring through SNMP/VistaLINK® (requires SmartMON™ capable companion fiber receiver). 13/18V DC adjustable LNB power with 22kHz tone is also provided.

Features
  • Extended frequency response for extended L-Band and off-air DTV signals
  • Protocol independent design - transports all modulation formats
  • LNB power with selectable 13/18V DC
  • LNB current limit & short circuit protection
  • LNB current monitoring for advance warning of LNB failure
  • 22kHz tone on/off for LNB local oscillator control
  • RF monitor output for signal peaking and signal distribution
  • Manual gain and AGC modes
  • Wide range adjustable gain in 0.5dB steps for fine tuning signal levels and optimizing CNR
  • Available with 1310nm, CWDM (ITU-T G.694.2) and +11dBm high power DWDM (ITU-T G.694.1) laser options
  • The 7708LT occupies one card slot and can be housed in the 1RU 7801FR frame which holds up to four single or two dual slot modules, the 3RU 7800FR frame which has a 15 slot capacity, the portable 3RU 350FR frame which has a 7 slot capacity, or a standalone enclosure which holds a single module.
  • SmartMON™ capability provides remote status monitoring via SNMP without a separate data connection
  • VistaLINK® capable for remote monitoring and control via SNMP (using VistaLINK® PRO) when installed in 7800FR frame with a 7800FC VistaLINK® Frame Controller
  • Fiber link provides electrical isolation between antenna and facility, mitigating ground loop and lightning issues

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Specifications

RF Input
Number of Inputs1
ConnectorBNC per IEC 61169-8 Annex A (F-Type and SMA optional)
Input Impedance75Ω (50Ω Optional)
Frequency Range
1310nm DFB Laser850MHz - 3000MHz
CWDM or DWDM DFB Laser88MHz - 3000MHz
Return Loss
120MHz to 2.3GHz> 14dB
2.3GHz to 3GHz> 12dB
Input Power Range-10dBm to -60dBm
Gain Range0dB to +30dBm in 0.5dB steps
IMD< -55dBc at -15dBm input and 0dB gain
Input IP3+10dBm
LNB Power
Voltage13V DC, 18V DC, off (selectable)
Current400mA
ProtectionShort Circuit, current limited
LO Control22kHz on/off (selectable)
RF Monitor Output
Number of Outputs1
ConnectorBNC per IEC 61169-8 Annex A (F-Type and SMA optional)
Output Impedance75Ω (50Ω Optional)
Return Loss> 15dB
Frequency Range88MHz to 3000MHz
Output Levelwithin -1.5dB of input signal
Optical Output
Number of Outputs1
ConnectorFemale SC/UPC, ST/UPC, FC/UPC, SC/APC, FC/APC
Operating Wavelength
Standard1310nm DFB
CWDM1270-1610nm
DWDMC-Band (ITU G.694.1 compliant)
Output Power
Standard 1310nm+2dBm
CWDM+2dBm
DWDM+11dBm
RF System Performance7708LT13 + 7708LRA pair
Frequency Range
950MHz to 2150MHz±1.5dB
120MHz to 3GHz±2dB
36MHz BW to 2.3GHz±0.25dB
RF System Performance7708LT13 + 7708LR-H pair
Frequency Range
950MHz to 2150MHz±1.5dB
120MHz to 2.3GHz±2dB
36MHz BW±0.25dB
Electrical
Voltage+12VDC
Power6 Watts max excluding LNB Power
Physical
Number of slots1
Compliance
Laser safetyClass 1 laser product
Complies with 24 CFR 1040.10 and 1040.11
IEC 60825-1
EMI/RFIComplies with FCC Part 15, Class A
EU EMC directive

Ordering Information

7708LT13Wideband RF Fiber Transmitter, 1310nm DFB laser, SmartMON™, VistaLINK®
7708LT13-B50Wideband RF Fiber Transmitter, 1310nm DFB laser, 50Ω BNC Connectors, SmartMON™, VistaLINK®
7708LT13-S50Wideband RF Fiber Transmitter, 1310nm DFB laser, 50Ω SMA Connectors, SmartMON™, VistaLINK®
CWDM (Ordering Information)
7708LTxxWideband RF Fiber Transmitter, CWDM DFB laser (Ordering Information), SmartMON™, VistaLINK®
7708LTxx-B50Wideband RF Fiber Transmitter, CWDM DFB laser (Ordering Information), 50Ω BNC Connectors, SmartMON™, VistaLINK®
7708LTxx-S50Wideband RF Fiber Transmitter, CWDM DFB laser (Ordering Information), 50Ω SMA Connectors, SmartMON™, VistaLINK®
DWDM (Ordering Information)
7708LTDxxxWideband RF Fiber Transmitter, DWDM DFB laser (Ordering Information), SmartMON™, VistaLINK®
7708LTDxxx-B50Wideband RF Fiber Transmitter, DWDM DFB laser (Ordering Information), 50Ω BNC Connectors, SmartMON™, VistaLINK®
7708LTDxxx-S50Wideband RF Fiber Transmitter, DWDM DFB laser (Ordering Information), 50Ω SMA Connectors, SmartMON™, VistaLINK®
Ordering Options
Note• Rear plate and fiber connector must be specified at time of order - eg: [model]+SC+3RU
• 75Ω BNC connectors are standard
Connector Suffix
+SCSC/UPC
+AP+SCSC/APC (Angle Polished)
+STST/UPC
+FCFC/UPC
+AP+FCFC/APC (Angle Polished)
+F7575Ω F-Type
Rear Plate Suffix
+1RU1RU rear plate for use with 7701FR Multiframe
+SAStandalone Enclosure Rear Plate
+3RU3RU rear plate for use with 350FR, 7700FR-C or 7800FR Multiframes
Enclosures
350FRPortable Multiframe which holds 7 single slot modules
7700FR-C3RU Multiframe which holds 15 single slot modules
7800FR3RU Multiframe which holds 15 single slot modules
7701FR1RU Multiframe which holds 3 single slot modules
S7701FR7700 Series Standalone Enclosure
Patch Cable
CB-FP1M-SCPCSingle mode fiber cable, 1m, SC/PC male termination
CB-FP1M-STPCSingle mode fiber cable, 1m, ST/PC male termination
CB-FP5M-SCPCSingle mode fiber cable, 5m, SC/PC male termination
CB-FP5M-STPCSingle mode fiber cable, 5m, ST/PC male termination
CB-FP10M-SCPCSingle mode fiber cable, 10m, SC/PC male termination
CB-FP10M-STPCSingle mode fiber cable, 10m, ST/PC male termination

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