User's Manual

Setup and Test
125
BER Test
The BER test is best done from the network management centre but if a management centre
backhaul has not yet been established the test may be performed at the AC site and should
be set up by connecting Local Netspan/Sitespan to AC Rack, building site locally and create
subscriber.
Setting up system tests at the Access Concentrator.
Create CAS XTU in a spare slot (slot 10 if spare).
Create CAS subscriber in Sitespan. Note the timeslot and E1 link used.
Fit CAS TU card to the shelf in the configured slot. Fit CAS TU card to the shelf in the
configured slot.
Setting up Test ST.
To perform overall system tests a test ST should be set up. The ST should be located
1 to 5 km from the CT in the centre of the lobe served by the CT. Set up using details
to match the RF channel, PN code and ST-ID for the CT sector to be tested.
Screen captures of the RF analysis may be taken and pasted into a document for
confirmation of the relative signal strengths.
Check for the ST to acquire a link and use STMON to ensure that the frequency
acquired is that of the CT and not that of an adjacent signal. (see STMON User Guide
for details of checking the channel.)
For Information on setting up a subscriber terminal see 605-0000-505. Subscriber
Terminal installation and commissioning.
Measuring BER
This process can be carried out at the Access Concentrator and loopback at the ST or
if using a Data ST the test may be performed at the L series ST and a loop applied at
the Exchange
a) Testing at the Access Concentrator
Connect BER Tester to E1 in link on the shelf backplane (or Type 43 converter module
if used) set above and inject a 64K Pseudo Random Pattern 215-1in the timeslot set
above.
Put a Loop on the ST from Netspan (In the ST Line List. check the Loopback box and
click OK).
Note: The loopback is dropped if the link fails or the ST power is cycled To reapply the
loopback the loopback tick box should be cleared and the OK button clicked. The
loopback should then be re-applied by re-checking the loopback tick box and clicking
the OK button.