Radio Ericsson Marconi Lh

Cost effective high capacity microwave transmission over long distances
The Marconi LH (Long Haul) microwave system
offers rapid roll-out of high transmission capacity
with SDH compatibility and integrated network
management. Based on long experience in Trunk
Radio, this modern long-haul radio system is a
more cost efficient solution than fiber in many
applications such as fastmodification of network
topologies, and the rapid roll-out of backbone
and feeder networks.
High integration, lowest cost of ownership
Marconi LH can also be used as a redundancy to
fiber or when long hop-lengths are needed under
difficult conditions. The modern, scalable and
highly integrated design provides lowest cost of
ownership in all parts of the products life cycle:
deployment, expansion andoperation.
Key features/benefits
• STM-1 transmission, upgradeable
to transparent STM-4
• Rapid roll-out
• Frequencies from 3.6 to 13 GHz
• Optimum spectrum efficiency through 64
MLQAM, 128 MLQAM and XPIC (Cross
Polarization Interference Canceller)
• Full software download capability
• Outstanding compact building practice and
low power consumption
• Highly robust system architectureproviding
high MTBF (Mean Time Between Failure)
• Multiple protection schemes
• The modern design provides lowest cost
of ownership
• Plug and Play for Spare Part Handling
Greater frequency band utilization
Up to ten RF channels can be used, depending
on the frequency pattern. Using XPIC, each RF
channel can be used on two polarizations, thus
doubling the transmission capacity. Thismeans
that up to twenty STM-1 or five STM-4 signals
can be transmitted via a single antenna.
XPIC equalizes cross-polar channels so that
the required transmission quality is achieved.
The system is operated with 64 MLQAM or
128 MLQAM, depending on channel spacing.
ATPC (Automatic Transmit Power Control) and
RTPC (Remote Transmit Power Control) allow
repeated reuse of the same frequencies indifferent
directions, in the network node. It also
reduces the effects of co-channel and adjacent
channel interference in networks with high traffic
density. When possible, the transmit power is
reduced by up to 20dB below its maximum
value. The highly flexible, software-controlled
ATPC and RTPC allow the correction of up- and
down-fading and can easily be adapted to local
conditions.Marconi LH is designed to make optimum
use of available frequency bands, with cochannel
operation using dual polarization.
Increased quality through radio
protection switching
The system uses protection switching functions,
such as frequency diversity or hot standby, to
increase the availability and quality of the transmission
links. These functions are independent
of SDH network protectionswitching, and are
implemented as Regenerator Section Protection,
without affecting any existing Multiplex Section
Protection or Ring Protection. The control channels
required for microwave radio protection
switching are transported in the Regenerator
Section Overhead.
The n+1 protection switching option can be
expanded step-by-step up to a 2x(9+1) configuration.
Subsequent extensions canbe implemented
without interruption. Optionally, the
protection channels can be released for the
transmission of lower-priority data.
Space or angle diversity can be used to guarantee
the required transmission quality even with
radio hop lengths of more than 30 to 40 km, or
where propagation conditions are difficult.
Compact 10-in-one system architecture
The system components are allhoused indoors
in ETSI cabinets. Up to 10 STM-1 channels,
including the protection switching function as
well as redundant power feed, can be accommodated
in a single rack. The system design is highly
modular, simplifying installation, expansion and
operation.
Each system consists of three sub-functions:
• RF branching
• Transceiver unit (TRX)
• Baseband unit (BBU)
Only the RF branching...