On 11/6/2009, Richard Jones wrote:
Has anyone had experience of section 5.5.1.5
It's a new section added for ADSL modem compatibility.
Hi Richard:
Yes, I have dealt with this requirement a couple times. It places very strict
limits on the differential signal power placed on tip/ring, out to 30 MHz.
I'm not quite sure why Australia felt they needed to restrict out of band
power so severely. Since it is a differential test, it does not appear that
the requirement is targeted at coupling into adjacent pairs in a cable bundle.
Rather, it appears that they were worried about out-of-band energy
interfering with a DSL modem operating on the same pair. I would have been
inclined to put the burden on the DSL splitter filter, rather than the POTS TE.
In any event, this requirement is more severe than any other worldwide
standard that I am aware of, and it sometimes causes unpleasant surprises when
a product intended for worldwide use is tested for compliance in Australia.
Joe Randolph
Telecom Design Consultant
Randolph Telecom, Inc.
781-721-2848 (USA)
j...@randolph-telecom.com
http://www.randolph-telecom.com <http://www.randolph-telecom.com/>
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