L-Band Conversion Frequently Asked Questions

Why is the PRSS converting to L-band interconnection?
New demodulators (demods) to replace the ComStream ABR700s currently in use may be placed in service as soon as calendar year 2003. The new demods will not be capable of utilizing a 70 MHz input signal but will require an L-band input signal. The ETRP project's goal is to assure that all stations are capable of utilizing the new demods as soon as they are available.

Is L-band "better" than 70 MHz interconnection?
L-band interconnection is the current industry standard; 70 MHz interconnections have become obsolete and expensive to maintain. Very little new off-the-shelf equipment is being supplied with 70 MHz as an input signal option. Once the new demods are installed, the downconverters required to produce a 70 MHz signal for the ComStream demods will no longer be required. This will reduce the number of potential points of failure in the system and help reduce the cost of a downlink to new stations entering the system.

Why should our station convert to an L-band interconnection now?
There are currently 428 stations utilizing the PRSS. Presently only about 42% of these stations have completed the L-Band conversion. If a station waits until the last minute, it may not be ready when the new equipment arrives. It is necessary to convert each station as soon as possible in order to keep up-to-date with the improvements made by the PRSS.

How about support for the L-band equipment?
ETRP staff are available for consultation on individual station issues at all times by telephone at 800.235.1212, ext. 2679. The L-band equipment currently being installed at system stations is supported by the Satellite Repair Depot. Support for 70 MHz equipment, including LNAs, cable demultiplexers, and downconverters will be phased out as soon as the new demods are deployed.

Why shouldn't my demods be located at the current downconverter location, rather than moving the downconverters to the current demod location?
The next generation system will require that the L-Band signal travel directly to the new receivers, and the new receivers may require some direct connection to other devices and systems. By locating the SSC downconverters next to the current ABR700 demodulators, stations will have the necessary signal to be ready to receive the next generation system.

What will the new demods do?
System requirements are being examined and refined by NPR Distribution staff with guidance from an advisory group of system users. We are currently looking for the following functionality: a store and forward system that supports both time-based and content-based automation cueing.