Low capacity Digital Radio System
Applications Main features System architecture Installation & maintenance Management Technical data
Microwave systems cover most of connectivity needs especially in the lower layers of the transmission networks, consolidating their role of reliable, easy-to-install and costeffective access solution. Siemens, used to be one of thefrontrunners in this market segment, is ready to match the expectations of the new incoming telecommunication era characterized by broadband and mobility convergence. Nowadays, the new challenge launched by operators aims to increase link density and capacity, leaving spectrum occupancy practically unchanged. Siemens, always ready to acknowledge
market indications and trends, adds to its extensivemicrowave portfolio the new line of point to point low capacity digital radio: SRAL XD. Siemens expertise covers most of the outstanding technologies which current applications are based on: switching, cellular technology, radio and networking, voice and data over IP and ATM. An outstanding turnkey project management capability, the ownership of a so wide range of in-house product lines and aworldwide field proven experience, represent the unequaled Siemens business card.
SRAL XD line is primarily designed for urban networks, but is also suitable in regional networks meeting all the requirements of access and trunk applications.
• Mobile Networks: in the 3G Mobile ATM based network, typically SRAL XD is used to collect traffic conveying fromNodeB to Hub stations; in the 2G networks it is already implemented to provide access to core networks. In the next future, the overlay of the two mobile networks will certainly benefit from SRAL XD upgrading facilities, rewarding operators with flexible and versatile infrastructures. • Fixed services Networks: SRAL XD supports ATM/IP networks, LAN and WAN.
A wide-range of applications ispossible, particularly since voice and data can be transmitted over the same microwave link. A typical scenario is an enterprise with a branch office located at some distance from the main premises. Service convergence is the word summarizing the trend of this kind of network, and once again flexibility becomes a must even in this case.
Other Mobile Operators
PublicInternet Enterprise Intranet
IP LAN Branch Office
Based on network specific needs, the operator can select either higher spectrum efficiency or higher system gain and hop lengths. All the parameters can be software selected locally or remotely in order to adapt the hardware platform to each single link characteristic in terms of available RF channel, payload, usablebandwidth and hop length. SRAL XD flexibility and versatility greatly optimize all the upgrading procedures and configuration changes. A terminal can be easily relocated without any hardware modification simply re-shaping its peculiar parameters on the new link requirements. Another important strong advantage is represented by the extreme compactness of SRAL XD Indoor Unit. A single 44 mm highunit is sufficient to implement any protected or unprotected terminal configuration, minimizing the impact of transmission equipment. Add/Drop and Crossconnection functionalities enrich the set of SRAL XD features: any E1 stream plugged in the near end terminal can be extracted from any E1 connector of the far end terminal, eliminating the need of bulky distribution frames. Furthermore, the Add/Dropfacility permits to drop the required E1 in station leaving the remaining streams passing untouched. Automatic Transmitter Power Control has been implemented to increase the system performances, reducing power consumption and interference in crowded nodes; ATPC function can be switched off, setting the transmitted power to a fixed value included in the ATPC interval.