|
GSM 900, EGSM 900, GMS 1800, GSM-R.
The Switched Technology® is a proprietary development done by RETEMSA's R&D. This technology enables channel selective repeaters with up to 100dB gain, while distance between the donor and the reception antenna can be kept in ranges of 10- 15 metres , thanks to its innovative solution that allows gain up to 15 dB over antenna Isolation. That implies important infrastructure savings, as a light tower or mast can be used for both antennas, obtaining low cost outdoor installations.
For example, with a switched channel selective repeater can achieve 85dB gain with a 70dB isolation (that is a equivalent to a 11 metres separation, 180º, with a standard yagi and coverage panel).
SWITCHED CHANNEL SELECTIVE GSM REPEATER GENERAL FEATURES
- It's necessary to configure the channel to amplify.
- In case the BTS channel allocation is changed, the repeater has to be reconfigured (software change, can be done remotely).
- It's EDGE and GPRS compatible.
- It is normally used areas with medium- low traffic volume and without interference limitations: rural zones.
- Bigger coverage is achieved as they provide high power and all this power is concentrated in only one channel.
- High gain, up to 100dB.
- The channel selective systems cannot be used with frequency hopping schemes.
- High isolation: Gain adjustable up to 15dB over Isolation.
- It allows using small size towers.
- They are used in zones with low traffic volumes.
- RETEMSA offers channel selective repeaters with 1 or 2 channels.
- It complies with ETSI normative. It provides selective coverage without interferences to other operators.
SWITCHED CHANNEL SELECTIVE REPEATERS SPECIFIC FEATURES
In EGSM 900 the values to amplify are located between 880 - 915 MHz for the uplink (mobile-BTS communication) and 925 - 960 MHz for the downlink (BTS-mobile communication).
In GSM 1800 the values to amplify are located between 1710 - 1785 MHz for the uplink (mobile-BTS communication) and 1805 - 1880 MHz for the downlink (BTS-mobile communication).
The GSM channels (200KHz BW) supports 8 simultaneous calls, then a channel selective repeater with 2 channels may support 16 simultaneous calls.
In GSM R the values to amplify are located between 876-880 MHz for the uplink (mobile-BTS communication) and 921 – 925 MHz for the downlink (BTS-mobile communication).
GSMR channels (200KHz BW) support 8 simultaneous calls, then a channel selective repeater with 2 channels may support 16 simultaneous calls.
The GSMR technology is the used one in Europe for railway communications.
|
COMPANY
