Joe, Thank you. Your explanation makes more sense than my intepretation. I'm surprised Austel didn't do better with the verbage.
Regards, Duane Marcroft _________________________________________ On Wed, 13 Nov 1996, Joseph W. Jackson wrote: > > Date: Tue, 12 Nov 1996 10:11:36 -0800 (PST) > > From: Duane J Marcroft <[email protected]> > > To: [email protected] > > Subject: Austel TS 002 > > Reply-to: [email protected] > > > Can someone give an explanation of the note following the statement below > > from Austel TS 002? > > > > 5.4.4 Impedance > > > > The impedance presented by the CE in the Hold State shall have a return loss > > greater than 10 dB over the range of 300 Hz to 600Hz and 15 dB over the > > range 600 Hz to 3.4 kHz against the test network shown in Figure 4. > > > > "Note: It is recommended that CE requiring a higher level of impedance > > matching may additionally incorporate a 600 ohm network as a > > switchable option" > > > > > > I understand the first part part, but what is the meaning of the note? > > Does this mean I can use a 600 ohm network instead of complex network? > > Not very clear. > > > > Thank you in advance. > > > > Regards, Duane > > > > Duane, > > According to CCL's Australia engineer Steve Seymour. > > What Austel is saying here is that the CE must meet the return loss > requirement with a complex termination. However, since it is > possible it may be be installed in a place where a complex termination is > not actually present, they may wish to incorporate a switching option > for a 600 ohm termination. This would allow a "higher level of impedance > matching." but since this is just a recommended option and not the > actual requirement, the equipment still must meet the return loss > requirement with the complex termination. > > In other words, you HAVE to meet the complex termination requirement > but if you'd like, you can have an 600 ohm circuit available as a > switchable option that matches a 600 ohm termination. > > Best Regards, > > Joe Jackson > [email protected] >
