Hello Mel,
the relevant national German type approval
'Type approval specification for terminal equipment intended for
connection to analogue accesses (with the exception of emergency
telephone and direct dialling-in accesses) in the telephone
network/ISDN of Deutsche Bundespost TELEKOM (July 1996)'
states under 2.5.2 DTMF dialing state that the return loss shall be at
least 14dB in the frequency range from 600 Hz to 1700 Hz.
I think this is what your customer had in mind.
Best regards
Volker Sypli
--
Tel.: +49 61 31 18 22 34
Fax.: +49 61 31 18 56 08
email: [email protected]
____________________________ Antwort-Abtrennung ________________________________
Betreff: German Return Loss, V.90
Autor: <[email protected] > bei Internet
Datum: 98-09-29 23:25
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?
I thank you all in advance for your assistance.
Mel Pedersen Midcom, Inc.
Homologations Engineer Phone: (605) 882-8535
[email protected] Fax: (605) 882-8633
