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LaserLink for cost effective deployment of micro-cells

RTF Article in rtf format
Infrared light transmits four times E1 or STM-1

CBL – Communication by light, a leading manufacturer of free space optics (FSO), presents its LaserLink series at ITU Telecom World from 12th to 18th October in Geneva. The LaserLink systems has been optimized for the usage in GSM/UMTS networks. They incorporate the needs of carriers and transmits up to four time E1 or STM-1 (155 Mbps) for deployment in the backbones. Distances up to 800 meters can be bridged with infrared light directly through the atmosphere. FSO has already proofen its reliability in serveral thousand installations around the world – mainly for coupling private networks for voice and data transmission. The idea behind the LaserLink is creating an universal chassis. The internal modular concept allows for many customer specific modifications.

LaserLink in GSM/UMTS networks

Modern GSM/UMTS networks need a lot of E1 links between different locations. They are essential for a wide distribution of Base Stations and, if necessary, micro- or pico-cells. STM-1 is standard in the backbone.

LaserLinks can connect Base Stations/Node B because they cover data of various speed via modulated infrared light sent directly through the atmosphere. Each link comprises of two terminals, which both have an optical transmitter and an optical receiver with the related signal processing inside. These LaserLinks are installed in weatherproofed housings for unlimited outdoor operation under all climatic conditions. A front screen defroster is optionally available whose use is recommendable in northern regions.

CBL LaserLinks – a reliable solution

CBL offers one version for 4E1-PDH traffic and one version for STM-1 traffic. Both are suited for all distances between 50 and 2000 meters and both use the same terminal at either end of the link. All LaserLinks have in common that four transmitters are switched in parallel to enlarge their aperture and power. Due to influence of birds, receiver's lens has 257 mm in diameter. The channel codec and the line interface depend on the version.

Management and dry alarm contacts

SNMP/web-based management is available for monitoring and configuration of the STM-1 LaserLink with an easy-to-use graphical user interface. CBL's solution provides management access via IP (Ethernet 10/100BT) and allows the permanent monitoring of configuration, fault and perfomance. Special items are:

  • e-mail-alarming;
  • extensive historical logging capability;
  • integration into existing SNMP-platforms such as e.g. HP OpenView with with a private MIB supporting RFC1213 and SNMPv1/2.


The PDH version provides only dry alarm contacts for external tunneling. CBL recommends to switch these alarm contacts to the base stations to be connected. Then the main functions of the LaserLink 4E1 will be visible to the OMC very quickly, easily and inexpensively.

Main benefits of LaserLink:

  • One type per capacity PDH or SDH only for full distance range results in minimisation of spare parts supply;
  • Large divergence, therefore no special pole constructions or expensive tracking systems are necessary;
  • Multi beam technology with large transmitter and receiver aperture offers best immunity against interruptions caused by rain, snow and birds;
  • Unique SNMP/Web-based management is available for LaserLink STM-1;
  • Eye safe laser class 1M operation;
  • Low power consumption at 48VDC optional 115/230 VAC with automatic switch over.

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