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Compaq Integrated Remote Console User Guide
Writer: Caroline Juszczak Project: Compaq Integrated Remote Console User Guide Comments: 281862-002
File Name: G-CH06.DOC Last Saved On: 11/20/98 4:17 PM
COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED
Data Terminal Ready (DTR) Interpretation
Most modems have a configuration option that controls the interpretation of the
DTR serial port interface signal. For IRC to function properly, the modem must
be configured to terminate a connection whenever DTR is dropped. Improper
setting of this configuration option results in the improper termination of an
existing IRC session and may result in the inability to establish a future IRC
connection. The &D AT command controls this setting in most modems. Since
modem vendors differ with respect to the default setting of this configuration
option, appending an &D2 to Integrated Remote Console’s initialization string
insures proper DTR interpretation.
Flow Control
IRC is designed to use hardware flow control on the serial port interface. For
IRC to function properly, the modem must be set to hardware flow control for
both receive and transmit operations. Improper setting of this configuration
option could result in the loss of characters, causing the remote terminal to
display incomplete or garbled information. Modem manufacturers differ with
respect to how this configuration option is implemented and controlled. Typical
AT commands to configure flow control include &K, &H, &R, &J, &E, \G or
\Q. Refer to your modem’s AT command reference for more details.
Error Correction
Most high-speed modems, by default, automatically negotiate an error control
protocol such as v.42 (LAPM) or MNP upon establishing a connection to
another modem. For connection speeds in excess of 1200 baud, error control is
essential to insure proper communication between IRC and the management
console. If error control is not negotiated between modems, erroneous data may
result in either the inability to obtain a login prompt, garbled characters on the
terminal display, or incorrect or extra keystrokes being sent to the server. Error
control is normally negotiated, unless it is explicitly turned off on either modem
or the modems are incompatible. If you encounter any of the problems
mentioned above, try using identical modems for both the server and the
management console. Typical AT commands to configure error control include
\N, &Q, &M, &E, and S-Register settings. Refer to your modem’s AT
command reference for more details.