I wish I had seen this when I was struggling with this 18 months ago.

My experience was that the CD didn't work.  I had it set up on a IIci,
USR sportster modems, and what I thought were good cables. I was forced to use
"local" on pppd, and deal with the fallout.  This could be due to modem
cables that presumed that CD was not available, or cockpit error.

Thanks for the info.

-dgl-

At 5:28 PM -0600 11/19/01, Bruce Anderson wrote:
>On Mon, Nov 19, 2001 1:20 AM, Donald Lee <mailto:donlee_68k@icompute.com>
>wrote:
>>>Add to: /etc/ppp/peers/answer
>>>
>>> modem                          # use full modem control
>>> cdtrcts                        # use hardware flow control on Mac's
>>
>>Three things:
>>
>>1. "modem" doesn't work on macs.  this option mostly causes pppd
>>to pay attention to the CD line on the serial port.  The DIN-8 connector
>>on Macs does not connect CD.  If you try to use it, you'll get
>>flaky stuff to happen, or it won't work.  I don't remember.
>>
>>
>
>
>1) In my experience ( IIci NetBSD-1.3) modem does work.
>I have never included  modem  without  cdtrcts  and
>I have no flaky stuff to report.
>
>2) CD is connected on most Macs that run NetBSD.
>
>RS-422 mini-circular 8 pin connectors:
>[snip]
>Pin - Signal
>  7 -  GPi   (General-Purpose input); connected to SCC Data
>    Carrier Detect (or to Receive/Transmit Clock if the VIA1
>    SYNC signal is high). Not connected on the Macintosh Plus,
>    Classic, Classic II, LC, LC II, or IIsi.
>
>------------
>old:
>The two serial ports used on Macintosh computers since the Macintosh
>Plus are
>       RS-422 mini-circular 8 pin connectors:
>       Pin Signal
>       1 - HSKo (Data Terminal Ready)
>       2 - HSKi (Clear To Send)
>       3 - TxD- (Transmit Data -)
>       4 - GND (Ground)
>       5 - RxD- (Receive Data -)
>       6 - TxD+ (Transmit Data +)
>       7 - GPi (General-Purpose input); connected to SCC Data Carrier
>       		 Detect (or to Receive/Transmit Clock if the VIA1 SYNC signal
>       		 is high). Not connected on the Macintosh Plus, Classic,
>       		 Classic II, LC, LC II, or IIsi.
>       8 - RxD+ (Receive Data +)  The space is between pin 4 and 5
>
>The following are the GeoPort Telecom Adapter Mini-DIN 9 pin 
>assignments:
> (where they differ from Mini-DIN 8 pin )
>Standard GeoPort   DMA GeoPort       Non-DMA
>      Definition    Definition    Definition
>       1  HSK(0) POD RESET/ATT POD RESET/ATT
>       7  GPi(A)   WAKEUP/TxHS        Unused
>       9  +5 VDC      DC Power      DC Power
>
>
>http://til.info.apple.com/tilarchive.nsf/artnum/n1699
>http://til.info.apple.com/tilarchive.nsf/artnum/n6703