Download 1 Introduction

Features Description 2-29
ETSI Test Channel 2/3
The ETSI test channel 2 is based on the NET 20 specifications. Note that the
actual implementation of this test channel is a super-set of the configuration in the
ETSI document. The Series II implementation however becomes identical to the
ETSI configuration when the following impairments are turned off (default state):
A to B Channel:
•
Auxiliary Echo
B to A Channel:
•
All impairments except Satellite Delay
The ETSI test channel 3 configuration is identical to test channel 2 configuration,
however the following impairments must be turned off (or not used during test):
•
Near Echo
•
Far Echo
•
Interruptions
•
Single Frequency Interference (SFI)
•
Impulse Noise
•
Random Noise
See application note, "Simulation of ETSI NET 20 Test Bench" for more
information.
2.4.2. I/O Configurations
The Series II allows two choices for the source of the input signal to the
transmission channel simulator, external and internal. The external selection
allows the user to input a signal via either the front panel or rear panel jacks. The
internal selection uses the Series II internal tone generator as the input signal.
Tone Generator
The Series II provides two independent internal tone generators. One generator is
dedicated to the A to B transmission channel and the other to the B to A channel.
The user may set the frequency of the internal tone sources in 1 Hz steps from 200
Hz to 3400 Hz. The level of the internal tone is preset to 0.0 dBm and is fixed.
When internal signal source is selected in the A to B direction of the Series II, the
tone source replaces the external user supplied signal. The internal tone source is
injected just after the input level control circuit. The tone will transverse all the A