The SDH Access Tester application
Page 62 Acterna ANT-5
4.8 VC12 Tributary Scanning Setup
Note: The Tributary Scan setup tab will become available if selected from the
Measurement Selection page. See Section 4.3 for further details.
The ability to switch tributary signals without fully de-multiplexing and re-multiplexing
the SDH signal is a very important feature of SDH. Using either an add/drop (ADM) or
cross-connect (DXC), networks can be re-configured to cater for network changes.
When implementing these changes it is important to verify the routing configuration of
the network element prior to switching it onto line traffic. This can involve testing each
VC12 tributary in an STM-4 – possibly 252 tributaries.
The Acterna ANT-5 is able to automatically scan individual or multiple tributaries to
verify the routing and error free operation. A pass/fail indication is given for each VC12
tested.
The tributary scanning tab will only
become available when VC12 in the
Virtual Container panel for Tx and
Rx are selected. Starting any test by
checking the Tributary Scan Setup
box, will scan the required tributaries.
In this example tributaries 30 to 39 will
be scanned.
The three Selection Methods that
can be selected are:
• All channels
• Specify From/To Channels
• Specify TUG-3’s
Users can select Failed, Passed or All from the View field. In these examples of the
user interface all Failed tributaries will be listed in the tributary scan results page. See
Section 4.16, VC12 Tributary Scanning Results
If the STM-4 option is fitted, the
following example shows tributaries
30-63 in channel 1 will be scanned,
followed by 1-63 in channel 2, 1-63 in
channel 3 and 1-39 in channel 4. For
details of tributary numbering refer to
section 12.3.
Note: Channels will be scanned by
tributary rather than ITU-T number
order.
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