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STL (Studio to Transmitter) Multichannel Links News Articles

Two-way Digital Backbone Installed in Lithuania

TTT personnel install one of the STL antennas.

A two-way digital multi-carrier wireless backbone was successfully installed to feed two LMDS base stations in the Neringa Peninsula of Lithuania.

The backbone transports several OFDM-modulated TV carriers as well as DOCSIS downstream data carriers in one direction and DOCSIS upstream data on the return path. It links the central headend to two LMDS base stations at 5 and 12 kilometers respectively, where it feeds two 28 GHz TV and data transceivers fabricated and installed by TTT. The 28 GHz system provides multichannel digital TV and DOCSIS Internet Access service to subscribers in the area.

The backbone was implemented with transceivers in the 17 GHz band, manufactured under Cable AML license by

Spanish company TTT. Each link consists of outdoor local and remote transceivers that interface directly with the 28 GHz base station transceivers. The multi-carrier wireless backbones pioneered by Cable AML eliminate the need for demodulators and remodulators at the remote base stations.

According to Luis Villa, TTT’s President, “the backbone links provided a transparent, high-performance connection to the LMDS base stations, allowing for control of TV and Internet subscribers from a central location with minimum system cost and complexity”.

MMDS System Expansion in Ecuador With In-Band STL

Installation crew at Chiguilpe (Ecuador) headed by owner Holger Velastegui

The existing MMDS system in Santo Domingo ( Ecuador), which was originally installed in 2003, has been such a commercial success that it was recently upgraded to reach subscribers in adjacent towns.

The expansion involved upgrading the transmitter from 100 Watts to 250 Watts and moving it about 10 kilometers to a new hilltop location where the increased signal availability can now reach towns up to 25 km away.

A new in-band, point–to-point STL (Studio to Transmitter Link), designed with a capacity for 31 channels, was also installed in Santo Domingo to transport the MMDS channels from the Headend to the new transmitter location. By using an in-band link it was possible to implement the STL without a separate frequency license, thus avoiding new license fees and other costs.

Following the expansion of the system, Holger Velastegui, President of CableZar, said he is so pleased with the performance of the system that he is already planning the addition of one repeater to reach the nearby town of Aulluriquin.

MMDS System Upgrades STL To Full Redundancy

Cable AML has upgraded an existing 8 GHz Studio-to-Transmitter Link (STL) from an unprotected to a fully protected, dual-redundant configuration.

The upgrade involved adding a second transmitter, a second receiver, and independent automated controllers for the transmitter and the receiver.

The STL was originally installed in 1998 for CBC in Barbados to transport 31 analog video channels from the Headend to an MMDS transmitter located approximately 11 kilometers away.  CBC decided to implement the STL with full hot-standby redundancy as part of the MMDS system upgrade from analog to digital.  Since all Cable AML equipment is digital ready, the existing STL required no modification to interface with the new digital Headend equipment.