# Q2687 disconnection

**URL:** <https://forum.sierrawireless.com/t/q2687-disconnection/1652>\
**Category:** Legacy AirPrime modules\
**Created:** [October 17, 2007, 2:13pm UTC](https://forum.sierrawireless.com/t/q2687-disconnection/1652 "2007-10-17T14:13:44Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![LOGTHE\_J](https://avatars.discourse-cdn.com/v4/letter/l/a9adbd/32.png) [@LOGTHE\_J](https://forum.sierrawireless.com/u/LOGTHE_J)\
**Post date:** [October 17, 2007, 2:13pm UTC](https://forum.sierrawireless.com/t/q2687-disconnection/1652/1 "2007-10-17T14:13:44Z")

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Hi all

Im am using a Q2687 modem to connect through a USB port, using the Wavecom drivers and a Windows dail-up connection. It seems to work fine, however the modem randomly disconnects.

From the output log file modem log-file it seems that the problem is due to the carrier detect, CD, however I’m not sure how to remedy this:

10-09-2007 23:51:02.390 - Modem type: Wavecom USB modem  
10-09-2007 23:51:02.390 - Modem inf path: oem52.inf  
10-09-2007 23:51:02.390 - Modem inf section: WMmodem  
10-09-2007 23:51:02.390 - Matching hardware ID: usb\vid\_114f&pid\_1234  
10-09-2007 23:51:02.421 - 19200,8,N,1, ctsfl=1, rtsctl=2  
10-09-2007 23:51:02.437 - Initializing modem.  
10-09-2007 23:51:02.437 - CD is high while initializing modem.  
10-09-2007 23:51:02.453 - Send: AT  
10-09-2007 23:51:02.453 - Recv: OK  
10-09-2007 23:51:02.453 - Interpreted response: OK  
10-09-2007 23:51:02.468 - Send: ATE0V1  
10-09-2007 23:51:02.468 - Recv: OK  
10-09-2007 23:51:02.468 - Interpreted response: OK  
10-09-2007 23:51:02.484 - Send: AT  
10-09-2007 23:51:02.484 - Recv: OK  
10-09-2007 23:51:02.484 - Interpreted response: OK  
10-09-2007 23:51:02.484 - Waiting for a call.  
10-09-2007 23:51:02.500 - Send: ATS0=0  
10-09-2007 23:51:02.500 - Recv: OK  
10-09-2007 23:51:02.500 - Interpreted response: OK  
10-09-2007 23:51:02.500 - 19200,8,N,1, ctsfl=1, rtsctl=2  
10-09-2007 23:51:02.531 - Initializing modem.  
10-09-2007 23:51:02.531 - CD is high while initializing modem.  
10-09-2007 23:51:02.546 - Send: AT  
10-09-2007 23:51:02.546 - Recv: OK  
10-09-2007 23:51:02.546 - Interpreted response: OK  
10-09-2007 23:51:02.562 - Send: ATE0V1  
10-09-2007 23:51:02.562 - Recv: OK  
10-09-2007 23:51:02.562 - Interpreted response: OK  
10-09-2007 23:51:02.578 - Send: AT  
10-09-2007 23:51:02.578 - Recv: OK  
10-09-2007 23:51:02.578 - Interpreted response: OK  
10-09-2007 23:51:02.578 - Dialing.  
10-09-2007 23:51:02.593 - Send: ATDT\*##\*\*\*##  
10-09-2007 23:51:02.593 - Recv: CONNECT 19200  
10-09-2007 23:51:02.593 - Interpreted response: Connect  
10-09-2007 23:51:02.593 - Connection established at 19200bps.  
10-09-2007 23:51:02.593 - Error-control off or unknown.  
10-09-2007 23:51:02.593 - Data compression off or unknown.  
10-09-2007 23:51:32.609 - Read: Total: 0, Per/Sec: 0, Written: Total: 0, Per/Sec: 0  
10-09-2007 23:53:32.609 - Read: Total: 0, Per/Sec: 0, Written: Total: 0, Per/Sec: 0  
10-09-2007 23:55:32.609 - Read: Total: 0, Per/Sec: 0, Written: Total: 0, Per/Sec: 0  
10-09-2007 23:57:32.609 - Read: Total: 0, Per/Sec: 0, Written: Total: 0, Per/Sec: 0  
10-09-2007 23:59:32.609 - Read: Total: 0, Per/Sec: 0, Written: Total: 0, Per/Sec: 0  
10-10-2007 00:01:32.609 - Read: Total: 0, Per/Sec: 0, Written: Total: 0, Per/Sec: 0  
10-10-2007 00:03:32.609 - Read: Total: 0, Per/Sec: 0, Written: Total: 0, Per/Sec: 0  
10-10-2007 00:05:32.609 - Read: Total: 0, Per/Sec: 0, Written: Total: 0, Per/Sec: 0  
10-10-2007 00:07:32.609 - Read: Total: 0, Per/Sec: 0, Written: Total: 0, Per/Sec: 0  
10-10-2007 00:09:32.609 - Read: Total: 0, Per/Sec: 0, Written: Total: 0, Per/Sec: 0  
10-10-2007 00:11:32.609 - Read: Total: 0, Per/Sec: 0, Written: Total: 0, Per/Sec: 0  
10-10-2007 00:13:32.609 - Read: Total: 0, Per/Sec: 0, Written: Total: 0, Per/Sec: 0  
10-10-2007 00:15:32.609 - Read: Total: 0, Per/Sec: 0, Written: Total: 0, Per/Sec: 0  
10-10-2007 00:17:32.609 - Read: Total: 0, Per/Sec: 0, Written: Total: 0, Per/Sec: 0  
10-10-2007 00:19:32.609 - Read: Total: 0, Per/Sec: 0, Written: Total: 0, Per/Sec: 0  
10-10-2007 00:21:32.609 - Read: Total: 0, Per/Sec: 0, Written: Total: 0, Per/Sec: 0  
10-10-2007 00:23:32.609 - Read: Total: 0, Per/Sec: 0, Written: Total: 0, Per/Sec: 0  
10-10-2007 00:25:32.609 - Read: Total: 0, Per/Sec: 0, Written: Total: 0, Per/Sec: 0  
10-10-2007 00:27:32.609 - Read: Total: 0, Per/Sec: 0, Written: Total: 0, Per/Sec: 0  
10-10-2007 00:29:32.609 - Read: Total: 0, Per/Sec: 0, Written: Total: 0, Per/Sec: 0  
10-10-2007 00:30:56.937 - CD dropped–Remote modem hung up. ModemStatus=02951e90  
10-10-2007 00:30:56.937 - While processing CD event, CD is reported as high when it should be low  
10-10-2007 00:30:56.937 - While processing CD dropping, CTS or DSR was found low.  
10-10-2007 00:30:56.937 - Hanging up the modem.  
10-10-2007 00:30:56.937 - Hardware hangup by lowering DTR.  
10-10-2007 00:30:56.937 - 19200,8,N,1, ctsfl=1, rtsctl=2  
10-10-2007 00:30:56.937 - Initializing modem.  
10-10-2007 00:30:56.937 - DSR is low while initializing the modem. Verify modem is turned on.  
10-10-2007 00:30:56.937 - CTS is low while initializing modem.

Does anyone have any suggestions?

Thanx in advance

Best regards