> -----Original Message----- > From: TC [mailto:[EMAIL PROTECTED] > Sent: Tuesday, March 08, 2005 9:35 AM > To: Asterisk Users Mailing List - Non-Commercial Discussion > Subject: Re: [Asterisk-Users] Tweaking AGGRESSIVE_SUPPRESSOR > > > >Wierdly that Tellabs still has issues with some calls (particularly with > >loud background noise) > >but upgrading to a newer 2572 64ms unit pretty much took care of that too. > > ah yes the old 2571/2572 trick, where you able to find sources for the 2 > port chassis & power supply ? the 2571, 2572 cards are easy to find >
Actually an eight slot wire-wrap chassis came with the 2531's and they're pin-compatible with the 257x cards. I took it home and went to town on it with an angle grinder and tig welder and, voila, four two-slot chassis. As for power supplies, eBay provided them also - a bunch of DIN rail mount 48vdc supplies from industrial instrumentation - these cards require less than 1 amp each to operate. If others were considering deploying these cards in desperation they could just as easily have cabling soldered directly to the card edge connector seeing as they're all 1/8" pads. You'd only need to connect approximatly 10 wires - Send IN & OUT, Receive IN & OUT and +/-48vdc. Demonstrating an effective, successful echo cancellation system would probably be enough to loosen the purse strings enough to cough up for an 'offical' chassis. I can post edge-connector pinouts and wiring instructions to the wiki if there is interest. Kris Boutilier
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