Bogus DCD+

Christopher H. Dow (dow@thelen.org)
Tue, 26 Aug 1997 22:36:53 -0700

[Livingston Folks, I've already sent this to you--I'm just hoping
someone who's reading mail now has run into this before...in other
words, I'm grasping at straws].

I got a PortMaster ISDN Office Router today. Installation was going
fine until we noticed that carrier was always detected. I could talk to
the modem just fine, but the PortMaster still detected carrier. I
trudged through the modem manuals for a while, and found the command for
turing off carrier detect (at&c1), but that didn't solve the problem,
either. I then disconnected the serial cable from s0 and guess what?
It still detected carrier. Here is the output from show s0 (with the
cable to s0 disconnect from the PortMaster):

router.thelen.org> show s0
----------------------- Current Status - Port S0
---------------------------
Status: USERNAME
Input: 43 Parity Errors: 0
Output: 84 Framing Errors: 1
Pending: 0 Overrun Errors: 0
Modem Status: DCD+ CTS+

Active Configuration Default Configuration (* = Host
-------------------- --------------------- Can
Override)
Port Type: Login/Netwrk Login/Netwrk (Dial In & Out)
(Security)
Login Service: Telnet Telnet
Baud Rates: 115200 115200,115200,115200
Databits: 8 8
Stopbits: 1 1
Parity: none none
Flow Control: RTS/CTS RTS/CTS
Modem Control: on on
Hosts: default

Terminal Type:
Login Prompt: $hostname login:
Dial Group: 1
router.thelen.org>

So, has anyone seen this before? I noticed there was some traffic in
the archives in '96 about this, but didn't see any resolutions.

Thanks,
Chris Dow