LinuxSA Mailing list archives

  From: phomann@dataaction.com.au
  To  : Daryl Tester <dt@picknowl.com.au>
  Date: Fri, 18 Feb 2000 09:20:35 +0930

Re: HELP ISDN ON LINUX

Certainly the "old" Telstra Microlink has the 2x64 + 16 as described, but the
new On-Ramp services have no D-channel :(
<vent>
That gets $#@!ing annoying when we can't talk to our TA's.
</vent>
In answer to the original question, not only will Tharmarajah have to RTFM on
the modem/TA, but he'll most likely also need to call up the friendly ISP, and
either get the current number he dials opened up to 128k, or more likely, get a
_different_ number for the second B-channel to dial.
Once the modem/TA knows where to dial the second channel, the software can be
set up as desired (permanent 128k, perm 64k + 64k DOD or whatever).

Cheers.

"He's not the Messiah, he's a very naughty boy!"
--------------------------------
Peter Homann
Systems Engineer
Data Action Pty Ltd.
Phone: +61 (08) 8201 1099
Fax: +61 (08) 8373 2410
Email: phomann@dataaction.com.au




Daryl Tester <dt@picknowl.com.au> on 17/02/2000 18:43:39

To:   Damien Wilson <wilbs@bigfoot.com>
cc:   Tharmarajah Kesavan <tkesavan@asiatic.com.my>, linuxsa@linuxsa.org.au
      (bcc: Peter Homann/Data Action)
Subject:  Re: HELP ISDN ON LINUX



Damien Wilson wrote:

> From what I understand, you need two ISDN lines if you want to use two
> B-Channels
>
> This also means that you will need two ISDN Modems

No, that shouldn't be the case.  Ye olde standard Microlink (now OnRamp
2, or whatever the Malaysian equivalent is) is a 2B+D ISDN connection,
meaning it has 2 64K data channels (for user use) and 1 16K signalling
channel (for call setup/tear-down).  The data channels can be operated
independently (ie, one could be used to place a data call while using
the other for a voice call), but the most common mode these days is
to aggregate the bandwidth using PPP Multilink.  To do this, however,
is a modem specific thing, meaning that Raj won't find the information
residing in any Linux documentation; rather he is going to have to read
the documentation that comes with his modem.

> The ISP that I work for has a 128k (ie 2x64k) ISDN connection to Telstra and
> it uses two B-channels on our Portmaster

Which is probably using two channels out of a Macrolink/OnRamp 10/20/30
(30B+D), with the remainder being used for incoming modem calls.


Regards,
  Daryl Tester

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