5 Access Server Configuration and Management Manual

Command Line Interface (CLI) Commands

AWAN 3883/4/5 Access Server Configuration and Management Manual—424242-001

C-5

Modem Signals Required

For RS-232 ports, Signal Control is enabled by default. (Signal Control cannot be

controlled or displayed in the RAS Management Tool; it can only be changed using the

CLI.) When Signal Control is enabled, the AWAN access server ignores input unless the

DSR modem signal is present, effectively preventing a new login. If the DSR signal is

dropped during a connection, the port logs out. Because DSR is usually connected to the

DTR signal from the terminal, powering off the terminal drops the DSR signal at the

AWAN access server and resets the AWAN access server port.

For Current Loop ports, Signal Control is set to disabled at factory configuration reset

and when Hardware Interface is set to 20mA Current Loop on the Line Tab dialog box

in the RAS Management Tool. Signal Control is set to enabled when Hardware Interface

is set to RS-232 on the Line Tab dialog box in the RAS Management Tool. Modem

signals do not apply to Current Loop devices. Current Loop ports cannot be reset by

powering off the terminal or printer.

Protocol Detection

When a port is in a idle state, the first input character begins the protocol detection

sequence. The protocol detection sequence determines if a terminal session or a specific

remote access protocol is being requested by the device.

Protocol detection is affected by the Term Type and modem configurations. (Term Type

may be configured on the Adv. Line tab dialog box in the RAS Management Tool or by

using the Change Port Type command.)

Each Term Type and modem configuration combination is described in the following

subsections.

Term Type Not 6530

Pressing the Enter key three times (ASCII carriage returns or hex 0d 0d 0d) indicates a

terminal session. Other sequences, which are unique to each remote access protocol,

identify the Point-to-Point Protocol (PPP), the Serial Line Interface Protocol (SLIP), and

so forth.

If the wrong character is entered, the procedure must be restarted. For example, if the

user typed Enter-Enter-X, the procedure could be restarted by pressing the Enter key

three times.

Note. For the purpose of this discussion, a modem port is defined as port on a modem port

module or an asynchronous port for which a modem has been configured.