Hi Ted, Could you share with us what you meant by the statement: "a V.90 modem with marginal return loss may not work very well. "
I assume you are not referring to return loss during DTMF transmissions. Thank you in advance. Regards, Duane Marcroft Telecom Consultant Peer Communications [email protected] ------------------------------------------ >Re: German Return Loss, V.90 > >The great thing about CTRs is that you can get your approval from pretty >well anywhere with the appropriate notified body. There should be no >problem in getting a V90 modem assessed in any of the major labs to >CTR21, provided it is designed to meet the requirements. Of course a >V90 modem with a marginal return loss may not work very well .......... > >Regards to all > >Ted Warren >Global Telecom Labs > > >Shane Patterson wrote: >> >> At 11:25 PM 9/29/98 -0500, you wrote: >> >Hello esteemed colleagues: >> > >> >I have a customer insisting that Germany has a requirement for 14dB Return >> Loss for non-voice telephony analogue terminal equipment in spite of the >> recent passing of CTR 21. This particular case is a V.90 (56K) modem. I >> figure either: >> > >> >1) they don't know what they are talking about (as CTR 21 is a CTR and it >> specifies 8dB from 300Hz to 4kHz, and 6 dB from 200 Hz to 300Hz) or >> > >> >2) I don't know what I am talking about, or >> > >> >3) this is something particular to V.90 (56K) modem requirements that is >> not harmonized that I don't know about. Is 14dB required for 56K? And if >> so, is it an industry standard or a legal standard? >> > >> >Any thoughts on this matter? >> > >> >> Hi, >> >> The final CTR21 adoption is great, but now we go through the fun transition >> period, during this period there are still reasons that some people may >> want country specific vs. CTR21 approval. >> >> - Their product may not be able to meet the current limiting requirement of >> CTR21 yet >> - Their customer may want German Specific approval >> - They may not know about CTR21 ( ??? ) >> >> Insofar as the 14dB limit I have not reviewed German specs lately so I >> can't comment specifcally on that. >> >> Just my thoughts, >> >> Shane Patterson >> Telcom Research >> www.telcomresearch.com
