What is the functionality of your Ethernet ports? Do they work
as a bridge, switch or as a router?
The ethernet ports work as a switch.
Is your radio channelized or unchannelized?
Our radio can transmit transparently all baseband signals according to ITU-T G.703 standard (4x2, 8, 16x2, 34Mbit/s) regardless of the ITU-T PDH hierarchical structure.
When did you develop the 1st radio?
Our company has 50 years experience in radio development. The
first radio was developed in 1953.
Can SparkWave radio links be used for a CDMA network?
Our SparkWave is PTP (point-to-point) radio family. CDMA (code
division multiple access) is one of the solutions of PTMP (point-to-multipoint)
radio access system. SparkWave can be used for access spots
connection of CDMA network.
What are the advantages of QAM modulation compared to QPSK?
QAM (quadrature amplitude modulation) abbreviation emphasizes
linear transfer characteristic of the modulation of two orthogonal
frequency carriers. The consequence is the possibility of base
band pulse shaping
instead of modulated signal frequency shaping. In case
of QPSK, the transmitter spectrum must be shaped after modulation,
which can cause problems
due to very narrow band pass filters.
What digital and what analogue channels can be transmitted over
Digital service channels of overall transmission capacity 512
kbi/s are available for 8 and 34 Mbit/s transmission system.
A digital service channel can be used for analogue and digital
voice channel (or two digital voice channels
for omnibus), for two digital service channels and for one
SparkView TMN communication channel.
Additional auxiliary digital service channels with overall
transmission capacity 512 Kbit/s are available for 34 Mbit/s
system. They and can be configured in different modes:
What input/output impedance of interfaces is available?
- One 512 kbit/s channel V.28 or V.11
- Three V.28 channels (up to 9600 bd), and two V.11 channels (up to 19200 bd)
- Two V. 28 channels (64 kbit/s) and one V.11 channel (128 kbit/s)
For E1 interfaces (2.048 Mbit/s) both impedances of 75 or 120
ohms are available. For E3 (34.368 Mbit/s) only 75 ohms is
What is the consumption in case of 1+1, hot stand by configuration?
For example: 1+1 configuration with two SYM34 modules, one
MXM216 module and two RFM18 has power consumption of <28.5W.
What is the output power in case of configuration 1+1, hot
The output power is equal to the nominal output power of 1+0
How do snow, ice and wind affect your antennas?
All antennas are tested on extremely hard climatic conditions
including wind, snow and ice. Windload of antenna tower and interface elements
must be calculated in the project.
How reliable is SparkWave radio? How did you calculate the MTBF?
The MTBF of our device is 170000 hours (19 years). Statistical
calculation was based upon a large quantity of installed
What are the advantages/disadvantages of SparkWave radio compared
to free air laser transmission except distance?
Free air laser transmission is one of the access network solutions.
It has some advantages (low cost, easy to install, high transmission
capacity - up to 2.5 Gbit/s, no frequency license is needed,
high security of data
transmission) and some disadvantages (attenuation and scattering
by atmospheric gases; fog, direct sun light and angle sensitivity
- only 3-6 mrad).
Special laser source (1400-1550 nm) safety for eye (ICE M1
class) must be selected.
In comparison with microwave radio, free air laser
transmission channel is much more unpredictable and influenced
by numerous meteorological conditions. Transmission availability
is very difficult to
predict and micro location conditions must be taken into account.
Microwave channel characteristics are much more defined. Consequently,
for microwave radio transmission it is easier to assure sufficient
transmission quality and availability.