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GPS and GNSS Timing Distribution Over Fiber System
System Description
GEMS GPS Over Fiber reference timing signals are widely used to synchronize communications for modern networking equipment like cellular base stations, allowing them to use limited bandwidth more efficiently and coordinate smooth handoffs. The recent proliferation of small cells for cellular service, utilization of CRAN centers, and technology updates have increased the demand for GPS timing distribution. GNSS and GPS systems typically consist of an active rooftop antenna, a GNSS receiver and a length of coaxial cable to connect them. A challenge arises, however, when the distance between the rooftop antenna and the cellular base station equipment (usually in the basement) is greater than 300 ft. Coaxial cable runs of over 300 ft are not practical for most GNSS receiver systems, so a fiber optical link is required at these or greater distances, and GEMS’s fiber optical links are some of the most trusted and cost-effective links in China. The RX Unit RF outputs connect to your base station equipment. The RX Unit is available with up to 8 or 16 RF outputs. The Rx Units are simply distributed in the racks with the BBUs or eNodeBs so the final connections require only lightweight, short RF jumpers.
Additional Features and Benefits
- Up to 128 GPS and GNSS RF connections
- Dual GPS antennas and dual Power supplier units
- Onsite alarm interface, Dry contact
Applications
- Wireless Telecommunications
- Mine shafts and Tunnel GPS
Typical System connection
OS2108TX + OS2108RX
On numerous carrier-grade applications, 8 BBUs can be installed per cabinet. This is a typically efficient application from one server room to another.
Transmiting Unit parameter
| Parameter |
GOFxxxTX |
RGOFxxxTX |
OS2xxxTX |
Remark |
| Frequency range (MHz) |
1150~1650 |
1150~1650 |
1150~1650 |
|
| Gain (dB) |
40 |
40 |
40 |
RX+TX gain |
| DC input |
12V DC |
Dual 48V DC 12V DC (Optioal) |
Dual 48V DC |
|
| Optical wavelength Sending |
1310 |
1310 |
1310 |
|
| Optical output power 25℃ Sending (dBm) |
8 |
8 |
8 |
|
| Light delay (NS) |
5 |
5 |
5 |
RX+TX |
| Optical fiber transmission distance (KM) |
50 |
50 |
50 |
|
| Optical connectors |
FC-APC |
FC-APC |
FC-APC |
|
| Antenna Ports |
GOF1xxTX 1 |
RGOF1xxTX 1 |
OS21xxTX 1 |
|
| GOF2xxTX 2 |
RGOF2xxTX 2 |
OS22xxTX 2 |
|
|
| RF Output Ports |
1 |
1 |
8/12/16 Optional |
|
| Optical Ports |
1 |
1 |
1/2/8 Optional |
|
| Dimension [mm] |
160x110x60 |
140x180x44 |
195x440x44 |
|
| Operating Temperature （°C) |
-20~65 |
-20~65 |
-20~65 |
|
| Parameter |
GOFxxxRX |
RGOFxxxRX |
OS2xxxRX |
Remark |
| Frequency range (MHz) |
1150~1650 |
1150~1650 |
1150~1650 |
|
| Gain (dB) |
40 |
40 |
40 |
RX+TX gain |
| DC input |
12V DC |
Dual 48V DC 12V DC (Optioal) |
Dual 48V DC |
|
| Optical wavelength Receiving |
1310 |
1310 |
1310 |
|
| Optical receiving power 25℃ (dBm) |
-30 |
-30 |
-30 |
|
| Light delay(NS) |
5 |
5 |
5 |
RX+TX |
| Optical connectors |
FC-APC |
FC-APC |
FC-APC |
|
| RF Output Ports |
1 |
1 |
8/12/16 Optional |
|
| Optical Ports |
1 |
1 |
1/2 Optional |
|
| Dimension [D*W*H, mm] |
160x110x60 |
140x180x44 |
195x440x44 |
|
| Operating Temperature （°C) |
-20~65 |
-20~65 |
-20~65 |
|
Timing Antenna parameter
| Parameter |
Timing4100 |
Timing4200 |
Remark |
| Frequency range (MHz) |
1558~1609 |
1550~1630 |
|
| Gain (dB) |
38 |
39 |
|
| DC input |
3.3~5V DC |
3.3~5V DC |
|
| Built-in surge protector |
Yes |
Yes |
|
| Supported System |
Beidou B1, GPS L1, GLONASS G1, Galieo E1 |
Beidou B1, GPS L1, GLONASS G1, Galieo E1 |
|
| Dimension [mm] |
Ø116×102 |
Ø112×205 |
|
| Connectors |
N Female |
N Female |
|
| Radome material |
ABS |
ABS |
|
| Operating Temperature （°C) |
-40~80 |
-40~85 |
|
Cases
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Shenzhen (Headquarters)
Tel:(86)755-29644311
Fax:(86)755-29644383
Email: sales@gemsnav.com
Add: F2,Building 6, RunDongSheng Industry Park, Baoan District, Shenzhen, China
Amy Wu /Sales Manager
Nancy Liang/Sales
ZHENG, GUOHUI/Technical support