Product Manual
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, off-air DTV, and other signals
- Protocol independent design - transports all modulation formats
- LNB power with selectable 13/18V DC
- LNB current limit and 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
- SmartMON™ capability provides remote status monitoring via SNMP without a separate data connection
- VistaLINK® capability is available for monitoring and control when modules are used in a 3RU 350FR, 7800FR frame and a 7700FC VistaLINK® frame controller is installed in Slot 1 of the frame
- Fiber link provides electrical isolation between antenna and facility, mitigating ground loop and lightning issues
- 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.
Specifications
| RF Input | |
|---|---|
| Number of Inputs | 1 |
| Connector | BNC per IEC 61169-8 Annex A (F-Type and SMA Optional) |
| Input Impedance | 75Ω (50Ω Optional) |
| Frequency Range | 50 – 3000MHz |
| Return Loss | |
| 120MHz – 2.3GHz | > 14dB |
| 2.3 – 3GHz | > 12dB |
| Input Power Range | -10dBm to -60dBm |
| Gain Range | 0 to +30dBm in 0.5dB steps |
| IMD | < -55dBc at -15dBm input and 0dB gain |
| Input IP3 | +10dBm |
| LNB Power | |
| Voltage | 13V DC, 18V DC, off (selectable) |
| Current | 400mA |
| Protection | Short Circuit, current limited |
| LO Control | 22kHz on/off (selectable) |
| RF Monitor Output | |
|---|---|
| Number of Outputs | 1 |
| Connector | BNC per IEC 61169-8 Annex A (F-Type and SMA Optional) |
| Output Impedance | 75Ω (50Ω Optional) |
| Return Loss | > 15dB |
| Frequency Range | 50 – 3000MHz |
| Output Level | Within -2.0dB of input signal |
| Optical Output | |
|---|---|
| Number of Outputs | 1 |
| Connector | Female SC/UPC, ST/UPC, FC/UPC, SC/APC, FC/APC |
| Operating Wavelength | |
| Standard | 1310nm DFB |
| CWDM | 1270-1610nm |
| DWDM | C-Band (ITU G.694.1 compliant) |
| Output Power | |
| Standard 1310nm | +2dBm |
| CWDM | +2dBm |
| DWDM | +11dBm |
| RF System Performance7708LT+7708LRA pair | |
|---|---|
| Frequency Response | |
| 950 – 2150MHz | ±1.5dB |
| 120MHz – 3GHz | ±2dB ±0.25dB on 36MHz BW to 2.3GHz |
| RF System Performance7708LT+7708LR-H pair | |
|---|---|
| Frequency Response | |
| 950 – 2150MHz | ±1.5dB |
| 120MHz – 2.3GHz | ±2dB ±0.25dB on 36MHz BW |
| 10MHz Performance7708T13 – 10MHz + 7708R – 10MHz pair | |
|---|---|
| Manual Gain Range | -5 to +10dB |
| Input Power Range | +10 to -40dBm |
| OIP3 | +29dB |
| Harmonic Rejection | +60dB |
| Electrical | |
|---|---|
| Voltage | +12V DC |
| Power | 6 watts max excluding LNB Power |
| Physical | |
|---|---|
| Number of Slots | 1 |
| Compliance | |
|---|---|
| Laser Safety | Class 1 laser product Complies with 24 CFR 1040.10 and 1040.11, IEC 60825-1 |
| EMI/RFI | Complies with FCC Part 15, Class A EU EMC directive |
Ordering Information
| Notes | • For companion receiver see the 7708LRA/7708LR-H catalogue page |
|---|
| 7708LT13 | Wideband RF fiber transmitter, 1310nm DFB laser, SmartMON™, VistaLINK® |
|---|---|
| 7708LTxx | Wideband RF fiber transmitter, CWDM DFB laser, SmartMON™, VistaLINK® |
| 7708LTDxxx | Wideband RF fiber transmitter, DWDM DFB laser, BNC connectors, SmartMON™, VistaLINK® |
| 7708T13-10MHz | 10MHz RF fiber transmitter, 1310nm DFP laser |
| 7708Txx-10MHz | 10MHz RF fiber transmitter, CWDM DFP laser |
| Ordering Options | |
|---|---|
| Note | • Rear plate and fiber connector must be specified at time of order - eg: [model]+SC+3RU |
| • standard RF connectors are 75Ω BNC | |
| Connector Suffix | |
|---|---|
| +SC | SC/PC |
| +AP+SC | SC/APC (Angle Polished) |
| +FC | FC/PC |
| +AP+FC | FC/APC (Angle Polished) |
| +F75 | 75Ω F-Type |
| -B50 | 50Ω BNC connector |
|---|---|
| -S50 | 50Ω SMA connector |
| Rear Plate Suffix | |
|---|---|
| +3RU | 3RU rear plate for use with 7800FR or 7801FR Multiframes |
| Enclosures | |
|---|---|
| 7800FR | 3RU Multiframe which holds 15 single slot modules |
| 7801FR | 1RU Multiframe which holds 4 single slot modules |
| Patch Cable | |
|---|---|
| CB-FP1M-SCPC | Single mode fiber cable, 1m, SC/PC male termination |
| CB-FP1M-STPC | Single mode fiber cable, 1m, ST/PC male termination |
| CB-FP5M-SCPC | Single mode fiber cable, 5m, SC/PC male termination |
| CB-FP5M-STPC | Single mode fiber cable, 5m, ST/PC male termination |
| CB-FP10M-SCPC | Single mode fiber cable, 10m, SC/PC male termination |
| CB-FP10M-STPC | Single mode fiber cable, 10m, ST/PC male termination |
