3820, 3830 | Lucent Technologies 6 specification

3800 Series Modem Installation

The recommended order of execution of AT commands if executed one at a time is as listed above due to the loss of command echo towards the bottom of the list. Alternatively, the single command “AT&F0 &D2 &S1 V2 X7 Y0 %C0 S41=3 S2=128 E0 &W0” can be executed.

When the 7400A data module is optioned for more than one speed it is necessary to set the modems’ ExtendResltCode to “Use_DTE_Rate.” One would suspect that the modems’ DialTone Detect and BusyTone could be “Disable” in a modem pooling application, but using the AT command “X7” to set the ExtendResltCode to “Use_DTE_Rate” automatically enables DialTone and BusyTone Detect. That is why they are optioned as enabled here (as well as being the factory default).

To run at speeds other than 19200 bps the DTE Rate and Dial Line Rate should be changed. Note that the AT prefix determines the asynchronous DTE Rate (as well as the Number of Data Bits, Parity, and Number of Stop Bits). The corre- sponding LCD command sequence for DTE Rate is under Configure/Edit/DTE Interface. The AT command for Dial Line Rate is “s41=r,” where r is the new rate. The corresponding LCD command sequence for Dial Line Rate is under Config- ure/Edit/Dial Line. The 3800 series modems have large buffers and perform speed conversions well.

Administrators may want to disable the AT Escape Char option. This prevents users from changing straps. This option is disabled by setting AT Escape Char to 128. The default value is 43 (i.e., a + sign).

3820

The 3820s should be installed in permissive mode. Insert a 4-conductor modular plug into the jack labeled DIAL/LEASED (3820). Option settings with equivalent AT command and Diagnostic Control Panel LCD command sequences are as pro- vided for 3810 above.

3830

The command “at i1” displays the firmware revision number and “at i19” displays the revision number. The 3830s should be installed by inserting a 4-conductor modular plug into the jack labeled LINE. Option settings by AT commands are as provided for the 3810 above. To verify the modem settings on a 3830 since the modem does not have an LCD display panel, use the following commands:

nAT&V0 to view active (operating) configuration options AT&V1 to view active (saved) configuration options

Issue 1 CRCS R6.0 April 1999 53

6 specifications

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