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KEYMILE: new XMP1 card for operators of high-voltage grids

by david.nunes

Hanover, August 26, 2010 – The new XMP1 card from KEYMILE interconnects the teleprotection units indispensable for monitoring power grids via the transmission network. Energy providers and railway network operators are now able to monitor the entire transmission link between teleprotection units.

Through the use of the new card, external converters are no longer required and the reliability of the complete system can thus be increased.

KEYMILE, one of the leading manufacturers of Next-Generation data transmission systems, enables both operators and users of high-voltage grids to monitor the entire transmission link between two teleprotection units by means of XMP1 using the new OptC37 card now available.

Power supply companies monitor and protect their power grids using teleprotection hardware. Such units are indispensable for power supply network protection as they allow early error detection in the power distribution network and thus help to avoid voltage breakdowns at customer sites. Using the data generated by teleprotection units, power supply companies and railway network operators also protect their own transformer stations and power grids from expensive damages that could be caused by malfunctions occurring in the power grid.

The teleprotection units are connected to the new card via a multi-mode fibre. The optical communication between the XMP1 card and teleprotection unit is based on the IEEE C37.94 protocol. This protocol defines a standard for the transmission of n x 64 kbit/s signals via optical interfaces between teleprotection units and multiplexers. With the external electro-optical converters used to date, the link status between the teleprotection hardware and multiplexers could not be monitored.

The new card is equipped with four optical interfaces acc. to IEEE C37.94 for the transparent transmission of n x 64 kbps signals with n = 1 to 12.

The four optical interfaces available are designed in compliance with IEC 60874-10 (BFOC/2.5). This new card is appropriate for use in the XMP1 and XMP1-SL subrack. In both systems, it occupies one card slot.

The XMP1 cross-connects the n x 64 kbps data streams of the new OptC37 card with other 64 kbps services and forwards these into the transmission network (backbone). Via the backbone, the data are routed to the XMP1 system located in the next transformer station and are thus used to transmit the measuring values of the two teleprotection units linked by means of a point-to-point connection. In addition, the XMP1 multiplexers are connected to the control centre of the operator via a management channel, so that all status information is also sent to the ServiceOn XMP1 (SOX) network management system. Thus, a consistent and seamless end-to-end monitoring of the communication path between the individual teleprotection units becomes possible. In case of a fault or failure, the control centre can now remotely identify the exact cause ­ for example a fracture of the optical fibre or a more serious protocol problem of the teleprotection units ­ and take appropriate measures.

The XMP1 multiplexer available can also be used for further services by installing the corresponding cards. Possible options could include for example functions such as the connection of monitoring cameras, data concentrators or ­ if required ­ emergency telephones with local-battery supply.


KEYMILE is one of the leading manufacturers of Next-Generation data transmission systems. The product portfolio includes flexible and robust multi-service access platforms, as well as stand-alone data transmission solutions. The multi-service access platforms allow telecommunications providers to supply a variety of voice and data services via copper wire and fibre optics. Simultaneous availability of standard and IP-based data transmission guarantees smooth migration to the Next Generation Network.

KEYMILE systems are used for reliable data transmission in mission-critical areas of telecommunications networks used by railway companies and energy suppliers, as well as in mobile and professional mobile radio networks. The company has major business bases in Germany and Switzerland, as well as subsidiaries and partners worldwide. It has installed systems in more than 100 countries. For more information visit www.keymile.com.

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