Quick Guide VX2000
11
GB
HRX(%): Enter the variation percentage for the DM and SES thresholds. Only for 1
channel bandwidth
DM Threshold: Choose the number of errors per minute to consider it as degraded.
Use the G.821 (4) default value when no other value is preferred. Only for line rate
64Kbit/s
SES Threshold: Choose the number of errors per second to be considered as
severely errored. Use the G.821 (64) default value when no other value is preferred.
Only for line rate 64Kbit/s
Auto print: Choose the autoprint condition for the test results between:
• Time interval: every 15 or 30 minutes
• DM: when the DM threshold value is exceeded
1.3.1 Running an Unframed BER Test
VX2000 adapter is fed directly by the D2000Pro, this cause a
decrease of the battery duration.
The test can be carried out both end-to-end and single end mode. In the first case is
necessary to put another D2000Pro/VX2000 at the remote end of the line (fig. 1-2).
In single-end mode, is necessary to carry out a loop over the line. The loop can be
request to DCE with C141 criterion, through a specific command given to the DCE
or carrying out a physical loop between TX side and RX side (see figure 1-1).
Fig. 1-2 (end-to-end)
When you have defined the setup for the Unframed BER test, continue as follows:
1
Select ‘Use this setup for testing’ in the first SETUP page.
2
Connect the instrument as displayed on the screen and
press the RIGHT CURSOR key.