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N/ACIP: Simplifying Codec Connections
Can your box play nice with dozens of other codecs?
So, to review, the standards for N/ACIP interoperability are just these: each device must use RTP over UDP in building the packets; audio must be sent using one of three codecs or PCM; and the initiation and termination of sessions between endpoints is done via SIP.
Most of the major codec manufacturers offer N/ACIP compliance in their product lines.
The ubiquitous nature of the Internet opens up many new possibilities for unique programming elements at a radio station. For news/talk stations: Need to send talent off to the war zone? For CHR stations: What about an impromptu interview with talent that is touring overseas? For sports stations: Dead audio pairs in the locker room? With the ever-increasing number of IP codecs in existence around this country and overseas, N/ACIP compliance is an important feature to consider when outfitting your own station with an IP codec or two. Sure, when you buy a pair of them, you're going to buy both from the same manufacturer; but when connecting on the spur of the moment to a location you never heard of that morning, knowing your box can talk with many of the dozens of codecs out there already is going to increase your chances of success.
Which IP codecs support N/ACIP? Here's a list of several.
As an early participant in creating N/ACIP, all AEQ codecs are N/ACIP compliant.
AETA was an early participant in N/ACIP compatibility.
A 2009 firmware release for its Access IP codecs makes them N/ACIP compatible.
The Iqoya link is N/ACIP compatible.
The C11 series codecs, Sporty and Flashman are N/ACIP compatible.
The Audio-TX STL-IP is compatible with N/ACIP.
The Suprima LC, Road Warrior and Suprimax are N/ACIP compatible.
The Opticodec 7600 is N/ACIP compatible.
The Zephyr/IP is N/ACIP compliant.
All IP codecs are N/ACIP compatible.
APT was an early adopter and participant of the N/ACIP standard and supply the Worldnet Oslo, Worldcast Equinox, Eclipse and Meridian as fully compliant codecs.
Irwin is transmission systems supervisor for Clear Channel NYC and chief engineer of WKTU, New York. Contact him at firstname.lastname@example.org.
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