Here is an explanation of DTR functionality from one of the websites: When the modem is disconnected from the telephone line and the DTE has set the DTR signal off, the devices are idle. If the modem detects an incoming call, it alerts the DTE via the RI signal. To answer an incoming call, the DTE must turn the DTR signal on and enter the dialog state. The modem responds by turning the CTS signal on to enter the dialog state. When a connection is successful, the modem enters the data state. The modem turns on the DSR and DCD signals and inbound data is accepted from the remote site. When the DTE turns the RTS signal on, the modem turns the CTS signal on and outbound data transmission takes place. If the remote modem disconnects, the local modem drops the connection and enters dialog state. The DTE disconnects the call by turning the DTR signal off.
Being more speicific to Cisco: DTR drop. The modem disconnected because the DTR signal from the host became inactive. Remote link disconnect. If an MNP-10 reliable link is established, the remote modem sends the disconnect reason across the link before disconnecting. The disconnect reason displayed is LOCAL (remote link disconnect) and REMOTE (the reason the remote modem disconnected). In simple terms think of DTR signal high as something that tells DTE & DCE that connection exist & when its dropped communication ends. DTR doesn't participate in sending or receving of data but as a control signal. You need to troubleshoot based on overall condition of all of your modems, its possible that one of the modem has gone bad and unable to detect carrier signal or unable to set DTR. If this condition exist for one modem out of 24, just disable it & life goes on. If its pervasive then you might have to look into other troubleshooting options available to you. In Access servers each indivisual modem can be tested for its functionality. Also phone companies doesn't tell the whole truth and/or tecnicians capability/willing to troubleshoot is another factor. Noisy lines affect speed, as modems are constantly negotiating for speeds. Debuging modem logs show speed negotiation. Also need to find out what compression method clients modem is using Vs. your access server modems. It has been long time since i worked on modems, Good luck. Habeeb > -----Original Message----- > From: Hamid Ali Asgari [SMTP:[EMAIL PROTECTED]] > Sent: Saturday, November 17, 2001 9:26 PM > To: [EMAIL PROTECTED] > Subject: Need Assitance on my Access-Server logs [7:26622] > > Hi > > I have a Cisco 3660 access-server with 6 NM-16AMs. The problem is > that my clients are being disconnected too frequently and sometimes > their connect-speeds are very low (21600 bps). Here are some of my > show command outputs: > > RamRam#show modem call stats 5 > > ..... > (the results have been cut out) > > lostCarr dtrDrop rmtLink retrain > Total 300 707 863 0 > > Can everyone tell me what these resukts whould mean (especially > DTRDROP and what would cause a DTR DROP)? > > I have asked for the Tel. lines to be tested and they said that they > are OK. Are there any problems with modems or not? > > Any input would be appreciated. > > Thanks > > Hamid > > > __________________________________________________ > Do You Yahoo!? > Find the one for you at Yahoo! Personals > http://personals.yahoo.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=26707&t=26622 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
