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This chapter contains information to help you to set modem strings and troubleshoot your modem connections to Cisco routers. For information about configuring a line to support modems, refer to the chapter "Configuring Terminal Lines and Modem Support" in the Access Services Configuration Guide.
Table 46 contains required settings and EC/compression settings for specific modem types. Use this information to create your modem scripts. Table 47 contains information for setting AUX ports and general comments. Refer to Table 48 for a legend of symbols used in these two tables.
| Settings Required for All Modems | Settings for EC/Compression | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Modem | FD | AA | CD | DTR | RTS/CTS Flow | LOCK DTE Speed | Best Error | Best Comp | No Error | No Comp |
| Codex 3260 | &F | S0=1 | &C1 | &D3 | *FL3 | *SC1 | *SM3 | *DC1 | *SM1 | *DC0 |
| USR Courier USR Sportster | &F | S0=1 | &C1 | &D3 | &H1&R2 | &B1 | &M4 | &K1 | &M0 | &K0 |
| Global Village Teleport Gold | &F | S0=1 | &C1 | &D3 | \Q3 | \J0 | \N7 | %C1 | \N0 | %C0 |
| Telebit T1600/T3000/WB | &F1 | S0=1 | &C1 | &D3 | S58=2 S68=2 | S51=6 | S180=2 S181=1 | S190=1 | S180=0 S181=1 | S190=0 |
| Telebit T2500 (ECM) | &F | S0=1 | &C1 | &D3 | S58=2 S68=2 | S51=6 | S95=2 | S98=1 S96=1 | S95=0 | S98=0 S96=0 |
| Telebit Trailblazer | &F | S0=1 | &C1 | |||||||
| AT&T Paradyne Dataport | &F | S0=1 | &C1 | &D3 | \Q3 | ---> | \N7 | %C1 | \N0 | %C0 |
| Hayes modems Accura/ Optima | &F | S0=1 | &C1 | &D3 | &K3 | &Q6 | &Q5 | &Q9 | &Q6 | <--- |
| Microcom QX4232 series | &F | S0=1 | &C1 | &D3 | \Q3 | \J0 | \N6 | %C1 | \N0 | %C0 |
| Motorola UDS FastTalk II | &F | S0=1 | &C1 | &D3 | \Q3 | \J0 | \N6 | %C1 | \N0 | %C0 |
| Multitech MT1432 MT932 | &F | S0=1 | &C1 | &D3 | &E4 | $BA0 | &E1 | &E15 | &E0 | &E14 |
| Digicom Scout Plus | &F | S0=1 | &C1 | &D3 | *F3 | *S1 | *E9 | <--- | *E0 | <--- |
| Digicom SoftModem | &F | S0=1 | &C1 | &D3 | &K3 | ---> | \N5 | %C1 | \N0 | %C0 |
| Viva 14.4/9642c | &F | S0=1 | &C1 | &D3 | &K3 | ---> | \N3 | %M3 | \N0 | %M0 |
| ZyXel U-1496E | &F | S0=1 | &C1 | &D3 | &H3 | &B1 | &K4 | <--- | &K0 | <--- |
| Supra V.32bis/28.8 | &F | S0=1 | &C1 | &D3 | &K3 | ---> | \N3 | %C1 | \N0 | %C0 |
| ZOOM 14.4 | &F | S0=1 | &C1 | &D3 | &K3 | ---> | \N3 | %C2 | \N0 | %C0 |
| Intel External | &F | S0=1 | &C1 | &D3 | \Q3 | \J0 | \N3 | %C1"H3 | \N0 | %C0 |
| Pratical Peripherals | &F | S0=1 | &C1 | &D3 | &K3 | ---> | &Q5 | &Q9 | &Q6 | <--- |
| Modem | Settings for Use with AUX Port | Other Settings | Comments | ||
|---|---|---|---|---|---|
| No Echo | No Res | CAB-MDCE | Write Memory | ||
| Codex 3260 | E0 | Q1 | &S1 | &W | |
| USR Courieræ USR Sportster | E0 | Q1 | *NA* | &W | |
| Global Village Teleport Gold | E0 | Q1 | *NA* | &W | |
| Telebit T1600/T3000/WB | E0 | Q1 | &S4 | &W | All Telebit modems need to have the speed set explicitly. These examples use 38400 bps. Using what Telebit calls "UNATTENDED ANSWER MODE" is the best place to start a dial in only modem. |
| Telebit T2500 (ECM) | E0 | Q1 | &S1 | &W | |
| Telebit Trailblazer | E0 | Q1 | *NA* | &W | Use "ENHANCED COMMAND MODE" on the T2500. |
| AT&T Paradyne Dataport | E0 | Q1 | *NA* | &W | Almost all Microcom modems have similar configuration parameters. |
| Hayes modems Accura/ Optima | E0 | Q1 | *NA* | &W | |
| Microcom QX4232 series | E0 | Q1 | *NA* | &W | |
| Motorola UDS FastTalk II | E0 | Q1 | *NA* | &W | |
| Multitech MT1432 MT932 | E0 | Q1 | &S1 | &W | |
| Digicom Scout Plus | E0 | Q2 | &B2 | &W | |
| Digicom SoftModem | E0 | Q1 | &S1 | &W | |
| Viva 14.4/9642c | E0 | Q1 | &S1 | &W | |
| ZyXel U-1496E | E0 | Q1 | &S1 | &W | Additional information on ftp.zyxel.com |
| Supra V.32bis/28.8 | E0 | Q1 | &S1 | &W | |
| ZOOM 14.4 | E0 | Q1 | &S1 | &W | |
| Intel External | E0 | Q1 | *NA* | &W | |
| Pratical Peripherals | E0 | Q1 | *NA* | &W | Based on PC288LCD. May vary. |
Table 48 contains a legend of symbols used in Table 46 and Table 47.
| Symbol | Meaning |
|---|---|
| *NA* | This option is not available on the noted modem. |
| --> | The command noted on the right will handle that function. |
| <-- | The command on the left will handle that function. |
| AUX port | These parameters are only required for pre-9.21 AUX ports or any other port without modem control set. |
Table 49 contains troubleshooting tips on modem access and control.
| Problem | Likely Cause |
| Connection refused. | Someone already has a conncction to that port
- r- an XEC is running on that port -or- the modem failed to lower CD after a call disconnected, resulting in an EXEC that remained active after disconnect. To force the line back into an idle state, clear the line from the console and try again. If it still fails, ensure that you have set modem inout command for that line. If you don't have modem control, either turn off EXEC on the line (by using the exec-timeout line configuration command) before making a reverse connection or configure the modem using an external terminal. As a last resort, disconnect the modem, clear the line, make the Telnet connection, and then attach the modem. The prevents a misconfigured modem from denying you line access. |
| Connection appears to hang. | Try entering "^U" (clear line), "^Q" (XON), and press Return a few times to try to establish terminal control. |
| EXEC does not come up, autoselect is on. | Press Return to enter EXEC. |
| Modem does not hang up after entering quit. | The modem is either not receiving DTR information, or you have not set up modem control on the router. |
| Interrupt another user's session when you dial in. | The modem is either not dropping CD on disconnect, or you have not set up modem control on the Cisco router. |
| Connection hangs after entering "+++" on the dialing modem, followed by an ATO. | The answering modem saw and interpreted the "+++" when it was echoed to you. This is a bug in the answering modem, common to many modems. There may be a switch to work around this problem; check the modem's documentation. |
| Losing data. | You may have Hardware Flow Control only on for either the router's line (DTE) or the modem (DCE). Hardware Flow Control should be on for both or off for both, but not for only one. |
| Using MDCE. | Turn MDCE into an MMOD by moving pin 6 to pin 8 because most modems use CD and not DSR to indicate the presence of carrier. You can also program some modems to provide carrier info via DSR. |
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