Date: Wed, 20 Mar 96 14:14:03 MET From: Greg Lehey <lehey.pad@sni.de> To: jkh@time.cdrom.com (Jordan K. Hubbard) Cc: hackers@freebsd.org (FreeBSD hackers), isdn@muc.ditec.de (Distribution List; FreeBSD ISDN) Subject: Re: ISDN: "modem" or board? (Was: Microsoft "Get ISDN"?) Message-ID: <199603201316.OAA28458@nixpbe.pdb.sni.de> In-Reply-To: <14217.827327370@time.cdrom.com>; from "Jordan K. Hubbard" at Mar 20, 96 5:09 am
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>>>> Of course, it would be really nice if you waited Teles out so you >>>> could test the ISDN stuff in the US :) >>> >>>: -) I'm willing if they are! >> >> Why don't you just contact them and ask them what the difference is. >> If, as I suspect, it's just the CAPI, you can use the German versions >> just as easily, since, as Gary says, we don't use any steenkin' CAPI. > > I did, and they said it was an electrical incompatibility with the > NT1. Whatever that means! Could be as simple as different impedances. And yes, that could be a show-stopper. Or it could be connections. Do you have a separate NT1? What connectors does it have? What voltage comes out of it? Over here, they have RJ45 connectors, and I'd have to measure the voltage. >> Does your Telco supply DSS1? > > Erm.. I'm afraid I don't know what that means. I only know that I > have a Northern Telcom DMS series switch and the TA appears to "log > in" with it successfully. I didn't set up anything specifically. DSS1 is the ITU-T Digital Switching Standard for ISDN. As I mentioned in another message, but I'm still not confident enough to claim categorically, this corresponds to Q.921/Q.931. It definitely includes clear 64 kb/s B channels. >>> Everyone from Motorola to ADTRAN seems to go the "home made" route, so.. >> >> How come they can work together? Or is this an incorrect assumption >> on my part? > > I've always been told that Motorola and ADTRAN TAs will talk to one > another but will _not_ bond the channels, at least according to my > friend at Cisco. Well, that's news. I think from the point of the FreeBSD project we should at least aim to be compatible with German CAPI channel bonding (if that in itself is standardized). If anybody either side of the pond can give any input on channel bonding, I'd be grateful, and I'm sure Gary will be too. Greg
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