Lucent Technologies PortMaster 4, Руководство по настройке

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9-1
Using External Modems 9
This chapter explains how to configure external modems to work with the PortMaster 4.
The information in this chapter does not apply to the internal digital modems that come
installed on Quad T1 and Tri E1 boards with modems.
Note – ComOS 4.0 and ComOS 4.1 do not support the add modem, delete modem,
and show modem commands for external modems. If you are running ComOS 4.0 or
ComOS 4.1 on the PortMaster 4, you cannot use the commands in this chapter to
configure external modems on asynchronous ports C0 and C1. Instead, you can attach a
previously configured modem to the C0 or C1 ports. Although you cannot display the
modem’s settings with the show modem command, it will function if properly
configured.
This chapter discusses the following topics:
• “Modem Ports” on page 9-1
• “Modem Functions” on page 9-2
• “Using Automatic Modem Configuration” on page 9-2
• “Configuring Ports for Modem Use” on page 9-5
See the PortMaster 4 Command Line Reference for more detailed command descriptions and
instructions.
Because the PortMaster is a DTE device, a straight-through RS-232 cable is used to
connect modems to it. Straight-through cables for modems use pins 2, 3, 4, 5, 6, 7, 8,
and 20. See the PortMaster 4 Installation Guide for modem cable information.
You can also configure the PortMaster 4 using the PMVision application for Microsoft
Windows, UNIX, and other platforms supporting the Java Virtual Machine (JVM).
PMVision replaces the PMConsole interface to ComOS.
Modem Ports
The PortMaster 4 supports external modems on two asynchronous ports (C0 and C1),
which are physically located on the manager module. Although you can attach a
modem to port C0, it is primarily designed to be used for a console connection with a
null modem cable. Port C1 is a standard asynchronous interface designed for connection
to an external modem.
To connect these ports to a terminal or other DTE, use a null modem cable, typically
male-to-female. Directions (input/output) are with respect to the PortMaster. The
PortMaster does not use the Data Set Ready (DSR) signal.
Note – When the console port is connected to a terminal, it uses software flow control
and therefore requires pins 2, 3, and 7 only.
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