Wavetek ANT-20 Operating Manual page 108

Broadband Analyzer/Generator
Test type: "ATM Layer QoS (SVC) - Called"
Settings
Basically the same as for "Calling" mode (see Sec. 2.4) but the test types in "Configure
instrument" are reversed.
Time sequence
After the measurement is started (Application Manager) the following automatic sequence
begins. The sequence is split into 5 phases:
Phase
Signaling
traffic
SSCOP
connection
Test channel
Test traffic
Results display
Signaling
conditions
NCS
QoS
1) VI "ATM Test Results"
2) Not Connected Seconds
Fig. TB-10 Time sequence at ATM traffic generation, "Called" mode: During the gate time, two calls were
Phases
1. The measurement is started:
The layer 2 signaling (SSCOP) connection is set up.
2. A connection (virtual channel) is switched as soon as a call is received.
3. The connection is set up. Test traffic is generated if it has been enabled by the user.
4. The connection is cleared down. The QoS parameters are saved in the log file as required.
The measurement is stopped. An existing connection is cleared down. The QoS parameters
are saved in the log file as required.
Phases 2, 3 and 4 can be repeated as many times as required during the measurement interval.
TB-14
1 2
discon. connecting
disconnected connecting
1
discon.
connec-
ting
2
accepted
Gate time
3 4 2
connected
connected disconnected connecting
discon.
connecting
connected
ANT-20/ANT-20E
t
3 5
discon.
connected disconnected
disconnected
discon.
connected
Technical Background