I've been getting doubles and triples lol
Diana
-----Original Message-----
From: Ian C. Blenke <icblenke@nks.net>
To: slug@nks.net <slug@nks.net>
Date: Thursday, October 10, 2002 2:43 PM
Subject: RE: [SLUG] ISDN Question
>On Wed, 2002-10-09 at 15:44, Mikes work account wrote:
>> Mark,
>>
>> When I did this years ago, I used a router to accomplish this task. At
the
>> time I programmed the router to do what I wanted.
>>
>> Michael C. Rock
>> Systems Analyst
>> Registered Linux User # 287973
>>
>> "The time has come the Walrus said to speak of many things,,,"
>> "Christians give up what they cannot keep,,to gain what they cannot lose"
>>
>> -----Original Message-----
>> From: slug@lists.nks.net [mailto:slug@lists.nks.net]On Behalf Of Mark
>> Sent: Wednesday, October 09, 2002 3:14 PM
>> To: slug@nks.net
>> Subject: [SLUG] ISDN Question
>>
>>
>>
>> Anyone with some knowledge of ISDN please email me as that I have a few
>> questions as to how one multiplexes into a two channel ISDN line.
>> Specifically if I have 2 phones and a computer, how would I do that.
>> Thanks.
>>
>> ------------------------------------------------------------------------
>> | Mark Bishop (mark@bish.net) | Computer Engineer |
>> | 813-253-2197 | Network Engineer |
>> | http://bish.net | Embedded Programmer |
>
>The wire coming into your house is known as an ISDN Basic Rate Interface
>(BRI) "U" loop (2B1Q). You plug the outside line into your Network
>Termination (NT1) device. This NT1 device is typically integrated into
>the customer's Terminal Adapter (TA). This TA is usually ISDN router,
>which usually provides one or two RJ11 POTS line jacks and a 10/100
>Ethernet RJ45 data jack for your network.
>
><IGNORE>
>You might read about "ST" bus equipment behind the NT1 termination
>device. This was an idea to provide independent data endpoints with
>unique Terminal IDs (TIDs) on customer prem. As this never really caught
>on (and IP over Ethernet did), this stuff simply isn't used - so ignore
>it.
></IGNORE>
>
>You need a BRI U-loop ISDN TA (NT1U) Router that has two POTS phone
>jacks and (potentially) an Ethernet interface.
>
>ISDN BRI lines consist of three channels: 2B+D. That's two Bearer
>channels (64k DS0) and a "Data" channel (16k) for Q.931 call signalling
>to the switch. All call signalling for incoming/outgoing lines goes over
>the D-channel, so your ISDN TA knows when to drop data channels and ring
>the appropriate POTS line.
>
>As for the Ethernet interface - you can do synchronous-PPP over a serial
>port if your TA and provider support V120, however most modern ISDN TA
>Router hardware replaces such cheap (and generally frustrating) gear.
>Motorola made an old Bitsurfer TA that worked this way years ago (I
>still have one in my closet ;)
>
>As for transport: multilink PPP (MPPP) is typically used now to "bond"
>the two channels into one apparent data stream. This is the same trick
>used today to run data simultaneously over multiple dialup modems - only
>over a 64k DS0 clear channels instead of nasty V.90 max
>56k-down/33.6k-up modem connections.
>
>Did this help at all? I can get into further detail if anyone is
>interested.
>
>- Ian C. Blenke <icblenke@nks.net>
>
>
>
>
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