AT&T IPC-1600 User Manual page 100

When using a Hayes* compatible MODEM, dial out once to configure the
MODEM before caIling into the MODEM.
The AT&T 446 Laser Printer and the HP† LaserJet Series II printer must
be installed on a serial port configured as a ttyih xyy device under the UNIX
system.
Use stty clocal to prevent loss of printer data for printers which raise Data
Carrier Detect (DCD) to signal erroneous data. These printers include the
AT&T 446 Laser Printer and the HP LaserJet Series II printer.
Use stty -clocal to allow UNIX system detection of printer disconnect.
* Registered trademark of Hayes Microcomputer Products, Incorporated
† Registered trademark of Hewlett-Packard Company
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