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Digi PortServer II User Manual

Digi PortServer II
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90030500B Configuring Modem Connections Page 139
Description of operation
The pseudo TTY driver will not allow access to the “master” side of a pseudo TTY by
more than one program at a time, so once RTTY accesses a pseudo TTY, it retains
control and excludes other programs.
To drop a connection, RTTY must close the device and then reopen it. Although the
device is closed for only a few milliseconds, it is still possible for another program to
gain control of the device before RTTY can resecure it. If that happens, CU and
UUCP may not operate correctly. We recommend that you select a high port number
to minimize problems.
Several computer systems on a network can be configured with pseudo-TTYs
associated with the same port (or port group) on a PortServer II. This is possible
because RTTY only attempts a connection when data is written to the pseudo-TTY. If
the PortServer II port is available, the connection is made and the program accessing
the port can continue. If the port is already in use by another system, the connection
fail (RTTY signals the application by momentarily closing and re-opening the pseudo-
TTY port). This method of operation is compatible with UUCP and CU on most
systems.
Configuring your system
1.
If, for example, you found
/dev/pty[pqrs][0-f]
on your system (64 ptys),
and you want to configure four modem ports, you could use
/dev/ptys[cdef]
for your pseudo-modem ports.
If you want to use PortServer II ports 1-4, add the lines shown below to your “rc”
startup script. The parameter
1
” adds a one second delay after connection before
sending data. (This ensures DTR high is established before the modem looks for
AT” commands). The “
d
” parameter runs the program as a daemon, and the “
s
parameter suppresses the Copyright Notice during bootup.
rtty -1ds /dev/ttysc dbps-nodename 2101
rtty -1ds /dev/ttysd dbps-nodename 2102
rtty -1ds /dev/ttyse dbps-nodename 2103
rtty -1ds /dev/ttysf dbps-nodename 2104
Note:
Use
21xx
raw connect port numbers, not
20xx
series telnet connect
numbers.
2. Add the modems to your UUCP Devices file, as shown below. On some systems,
you can omit the
hayes
keyword; on other systems, you must replace it with the
name of the dialer script your modem uses.

Table of Contents

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Digi PortServer II Specifications

General IconGeneral
Product TypeSerial Server
Ports8
Serial InterfaceRS-232
Network InterfaceEthernet
ProtocolsTCP/IP, Telnet, SNMP
ManagementSNMP
Operating Temperature0°C to 50°C (32°F to 122°F)
Humidity5% to 95% non-condensing

Summary

Important Information

Federal Communications Commission (FCC) Statements

Details FCC compliance statements including RFI, labeling, modifications, and cable requirements.

Industry Canada Compliance Statements

Provides Industry Canada compliance statements and certification standards met by the PortServer II.

About this User's Guide

Where do I look for more information?

Guides users on how to find information within the user guide and other documentation.

Document Conventions

Other PortServer II Documentation

Lists additional documentation available for further information on PortServer II and its related software.

Chapter 1 Introduction

Features and Functions

Introduces the PortServer II, detailing its capabilities, connectivity options, and support for various serial devices.

Basic Operation

Explains the basic configuration of serial ports, terminals, users, and printers for PortServer II operation.

Typical Applications

Terminal server configuration - local devices and RealPort

Illustrates a configuration with local terminals connected to application servers via PortServer II and RealPort.

Specifications

Network compatibility

Details the Ethernet standards, connectors, and compatibility features of the PortServer II.

Ports

Lists the serial port specifications, speed capabilities, protocol support, and expansion module connector.

Power Requirements

Specifies the external power supply requirements and internal supply voltages for the PortServer II.

Chapter 2 Operation

PortServer II Front Panel

Details the front panel controls, indicators, and alphanumeric display for status and diagnostics.

Interpreting the LED Indicators

Explains how to interpret the status shown by the LED indicators for serial ports and Ethernet.

PortServer II Side and Rear Panels

Details the connectors and controls on the side and rear panels of the PortServer II.

Chapter 3 Installation

Before you Begin

Lists essential steps and considerations before starting the installation of PortServer II.

Safe installation practices

Provides essential safety warnings and practices to follow during the installation of PortServer II.

Connecting PortServer II to serial devices

Explains how to connect various serial devices using different RJ-45 and RJ-11 plugs.

Chapter 4 Basic Configuration

Entering Configuration Commands

Explains how to enter commands at the PortServer II command line prompt for configuration.

Logging on to PortServer II

Details the procedure for logging into PortServer II using a terminal or PC for configuration.

Configuring the Ethernet Connection

Guides users through setting up essential network parameters like IP address and node name.

Configuring a User

Details how to create and configure user accounts with basic access and network parameters.

Chapter 5 Configuring Terminals

Setting Up a Terminal

Details the procedure for configuring PortServer II for a connected terminal, including type and baud rate.

Chapter 7 Configuring Multiple Sessions and Multiple Screens

Multiple Sessions

Details how users can start and manage multiple login sessions per port, up to a limit of nine.

Multiple Screens

Explains how to configure ports for terminals supporting multiple screens for enhanced usability.

Chapter 8 Configuring WAN Connections

WAN Connections Explained

Defines WAN connections and the required user/filters table entries for incoming, outgoing, and bidirectional links.

Incoming WAN Connections

Explains how incoming WAN connections are established and configured, including user and port settings.

Outgoing WAN Connections

Details how outgoing WAN connections are initiated, including options like dialout and ActivateTime.

Filters

Explains the use of filters for PPP, SLIP, CSLIP connections to manage traffic and security.

Chapter 9 Configuring Modem Connections

Configuring the Modem Connection

Details setting serial port speed, device type, and flow control for modem connections.

Dialer and Login Scripts

Explains creating scripts for dialing modems and logging into remote systems, including state definitions.

Chapter 10 Configuring TCP/IP Routing

Types Of Routing Available

Describes PortServer II's routing capabilities: Passive and Active, and sources for Route Table information.

Passive Routing

Guides on configuring a PortServer II port for passive routing, including WAN connections and static routes.

Active Routing

Explains configuring PortServer II for active routing, including WAN connections, static routes, and forwarding states.

Chapter 11 Configuring RealPort Connections

RealPort Basics

Explains the RealPort protocol, its advantages over TCP/IP, and driver software requirements.

Configuring PortServer II for RealPort Operation

Details setting authorization, changing RealPort TCP port, and setting device types for RealPort connections.

Chapter 12 Configuring SNMP

Configuring the SNMP Agent

Explains the SNMP command syntax for enabling the agent, setting trap destinations, and administrator contact information.

Monitoring SNMP status on PortServer II

Shows how to check the current SNMP agent configuration and status using the 'snmp' command.

Chapter 13 Configuring Printer Connections

Configuring a Printer Connection

Details setting serial port speed, character size, parity, and flow control for printer connections.

Printing using lpd Protocol

Explains configuring the printer with the lpd protocol by specifying queue names and options.

Chapter 17 Troubleshooting

Power On Self Test

Details the POST sequence, tests performed, and corresponding LED indicators for hardware diagnostics.

User Diagnostics

Describes running diagnostics from a terminal or the front panel to check PortServer II hardware functionality.

Statistics

Details how to view and clear network statistics tables such as framerelay, ip, icmp, tcp, and udp.

Hardware Error Counts

Lists and explains various hardware error counts related to Ethernet overruns, collisions, and frame errors.

Trace Messages

Explains how to enable trace messages for troubleshooting, including modes, states, and masks.

Troubleshooting Frame Relay

Provides guidance on troubleshooting Frame Relay link issues: link not coming up or not routing packets.

Chapter 18 Digi Support Services

Technical Support

Explains the process for resolving product difficulties and how to contact Digi Technical Support for assistance.

Glossary

Index

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