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3800 Series Modem Installation
Issue 1 CRCS R6.0 April 1999 53
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:
AT&V0 to view active (operating) configuration options
AT&V1 to view active (saved) configuration options