A high frequency 28 GHz Local Multipoint Distribution System (LMDS) has been installed in Lisbon, Portugal. The multi-cell system provides broadband bi-directional multimedia and data services, including Subscription Digital TV, High Speed Internet, Video Conferencing, VoIP and High Speed Data Interconnect.

The system architecture is based on high-capacity macro cells (5-Km radius) interconnected to a central headend and data center by a bi-directional AML link. Smaller data cells within the service area are interconnected by in-band 28 GHz point-to-point links routed through the high-capacity LMDS transceivers in the macro-cells.

The system’s cellular structure and the AML backbone for trunking provides the operator with maximum flexibility to optimize coverage in desired target areas regardless of the availability of fiber interconnections between cells.

At the headend, a digital TV satellite reception system provides digital TV multiplexed channels for TV broadcast. MPEG-2 compatible data streams are multiplexed with the video data streams in the downstream direction. The system’s upstream data capability makes it feasible to implement true subscriber interactivity.

The customer equipment consists of a 28 GHz CPE (see article on page 4) Transceiver with an integrated 10 inch parabolic antenna. Dual outputs provide separate TV and two-way data capabilities.

Cable AML is proud to have contributed LMDS and AML hardware to what is undoubtedly the most advanced multimedia LMDS system in the world.