ISDN / BT home highway
Mark Ovens
marko at freebsd.org
Fri Oct 6 00:32:09 BST 2000
On Tue, Oct 03, 2000 at 06:37:44PM +0100, Brian Somers wrote:
>
>
> A TA that does the MP stuff itself isn't a great deal of use with
> standard 115200bps UARTs - link bandwidth is higher than DTR
> bandwidth.
>
Is this not true of external modems as well though? I've got an internal
one and can regularly exceed 115200bps:
PPP ON parish> show phy
Name: deflink
State: open (with carrier)
Device: /dev/cuaa2
Link Type: interactive
Connect Count: 1
Physical outq: 0
Queued Packets: 0
Phone Number: 1234567890
Defaults:
Device List: "/dev/cuaa2"
Characteristics: 115200bps, cs8, no parity, CTS/RTS on
CD check delay: device specific
Connect time: 1:00:51
10416974 octets in, 164815 octets out
overall 2898 bytes/sec
currently 115 bytes/sec in, 51 bytes/sec out (over the last 5 secs)
peak 23908 bytes/sec on Thu Oct 5 23:57:40 2000
PPP ON parish>
That's 239080bps (at 10bits/byte including the stop bits), over double the
rate of a 16650 UART, so if this was an external modem what would happen?
Reduced transfer rates or would the modem buffer the data?
> The only way to go is ppp(8), either with two serial connections to
> two TA ports (I guess mpd would work in this scenario) or via an ISDN
> card (the best way) IMHO :-)
>
> > Neil.
> > --
> > Neil C. Ford
> > neil at ourshack.com / neil at binky.demon.co.uk
> > Sent using Pronto! - http://www.muhri.net/pronto
>
> --
> Brian <brian at Awfulhak.org> <brian@[uk.]FreeBSD.org>
> <http://www.Awfulhak.org> <brian@[uk.]OpenBSD.org>
> Don't _EVER_ lose your sense of humour !
>
>
>
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