Specifications

Configuring Modem Signals
11-8
Specifying SIGNAL SELECT
Introduction
The SIGNAL SELECT characteristic is used only with MODEM CONTROL access
servers. This characteristic determines which of two sets of signals that the access
server uses:
• CTS, DSR, RTS, and DTR
or
• RI, DCD, DSRS, and DTR
The port device must be cabled correctly to work with the set of signals that you
choose.
Determining When to Use a Signal Set
The following shows when to use these signals:
• If the modem speed is below 9600 baud, configure the port SIGNAL SELECT
characteristic to RI-DCD-DSRS-DTR.
• If the modem speed is 9600 baud or above, configure the port SIGNAL SELECT
characteristic to CTS-DSR-RTS-DTR.
Enabling CTS/RTS flow control for access servers with attached modems with
9600 baud or greater enables a faster response time from the access server
hardware.
In order to enable SIGNAL CONTROL, you must configure SIGNAL SELECT.
Example: Enabling SIGNAL SELECT
The following example shows to configure SIGNAL SELECT to CTS-DSR-RTS-
DTR on port 10:
Local> DEFINE PORT 10 SIGNAL SELECT CTS-DSR-RTS-DTR
Local> LOGOUT PORT 10
A maximum supported baud rate of 9600 on a modem is a guideline for signal set
selection. The signals used are a factor of modem technology, not the actual baud
rate for data tranfer.
NOTE