Wavetek ANT-20, Operating Manual

Page: 43 / 126

ANT-20/ANT-20E Broadband Analyzer/Generator
Operation O-25
5 Test Types
5.1 Overview
“Test types” serve to structure the measurement modes and the so-called connection modes.
A “test type” comprises a measurement mode and a connection mode. The connection mode
defines how the virtual ATM connection is switched.
To allow precise line-up of traffic contracts, facilities must be provided to allow virtual
connections to be switched between two or more test instruments. Some test types are
designed for such configurations involving several test instruments. Software version 6.5
initially only provides support for the “ATM-layer Quality of Service” measurement mode; the
following connection modes are possible:
The test type is selected in the “Test Setup” dialog of the “ATM Test Control” VI. The
configuration of the instrument determines which of the test types will be available for selection.
Only those test types that are possible and meaningful for the given configuration setting are
displayed for selection.
The table below indicates the test types that can be selected:
Connection Mode Meaning
For PVCs
Point-to-Point The virtual connection is a point-to-point connection between two or more
instruments.
Looped The virtual connection is a looped-back point-to-point connection. The loop-
back can be either in the ATM layer or in the physical layer.
For SVCs
Calling The virtual connection is a point-to-point connection between two or more
instruments. The instrument initiates the call (calling instrument).
Called The virtual connection is a point-to-point connection between two or more
instruments. The instrument takes the call (called instrument)
Self-Call The virtual connection is a looped-back point-to-point connection in the ATM
layer. The instrument generates a self-call.
Table O-13
Possible connection modes
Test type Signaling
activated Topology Notes
ATM Layer QoS - Looped Topology No Looped Only test type available for
Looped topology.
ATM Layer QoS (PVC) - Point-to-point No Emulate Two instruments required.
ATM Layer QoS (PVC) - Looped No Emulate -
Table O-14 Übersicht der wählbaren Test types