Specifications

SECTION
4-1
Cisco AS5x00 Case Study for Basic IP Modem Services
11/24/1999
4
Verifying Modem Performance
In this Section
This section describes how to verify and test modem performance on a Cisco AS5300 and AS5800
by using an EXEC terminal shell service.
The following sections are provided:

Background on Asynchronous Data Communications

Understanding Modem Modulation Standards

Task 1. Initiating a Modem Loopback Test Call

Task 2. Initiating and Inspecting a V.90 Test Call
An EXEC terminal shell service tests modem performance (lower layers) independently of PPP
(and higher layers). A terminal-shell service test gets quick test results in a simple environment.
In this case study, Maui Onions and THEnet perform the same tasks to verify modem performance and
set up V.90. Maui Onions uses a Cisco AS5300; THEnet uses a Cisco AS5800.
For information on how to manage modem pools and collect call statistics, see the section “Modem
Management Operations.”
Background on Asynchronous Data Communications
Understanding how RS-232 states function with the Cisco IOS software helps you test and troubleshoot
modem connections:

Async DataComm Model

Logical Packet and Circuit Components of a NAS

RS-232 in Cisco IOS

Cisco IOS Line-Side Inspection