Wavetek ANT-20, Operating Manual

Page: 18 / 126

Broadband Analyzer/Generator ANT-20/ANT-20E
I-10 Introduction
Port configuration
The Port configuration (topology) describes the way in which the test equipment is connected to
the device under test on the physical layer.
Example topologies:
•
Emulate
•
Looped (between generator and receiver)
•
Monitor (not yet supported)
Traffic type
The traffic type indicates the type of traffic contract. This term is defined by the ATM Forum. The
ITU equivalent term is “broadband bearer capability”.
A traffic type must be specified for each virtual channel defined in the Channel Editor of the
“ATM Test Control” VI.
Example traffic types:
•
CBR (constant bit rate)
•
VBR-nRT (variable bit rate, non real time)
•
DBR (deterministic bit rate)
•
SBR (statistical bit rate)
The CBR and DBR traffic types are identical in most respects. This is also true of the VBR-nRT
and SBR traffic types.
Switched Virtual Circuit (SVC)
•
Forward is the direction from the “calling” device to the “called” device.
•
Backward is the direction from the “called” device to the “calling” device.
Permanent Virtual Circuit (PVC)
•
Forward is the send direction of the device.
•
Backward is the receiving direction of the device
Device means: ANT-20/ANT-20E.