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2-7
Using the Analyzer
To Connect to the System Under Test
2 Using the Analyzer
Passive Test Connection
Some ATM switches have dedicated test access ports. All traffic from the
switch is transmitted through both the regular port and the dedicated test
port. Connecting the analyzer to the dedicated test port is completely
non-intrusive. This type of connection never interferes with live traffic,
even during set up.
When using a non-intrusive, passive connection, the interface
configuration of the analyzer is not important. The analyzer’s default
interface configuration is full duplex.
T-piece Test Connection
This is a type of non-intrusive test connection that requires a T-piece or
splitter already present at a cross-connect. However, it does steal some
power from the traffic being transmitted over the network, so the T-piece
or splitter should be as close as possible to the transmit source (where the
power is at its strongest).
• For electrical networks, using a T-piece or splitter is common practice.
• For optical networks, special optical splitters are available. Using a T-
piece is possible only if your switch or network supports it. (The
splitter can draw up to 10% of the transmitted power, which affects
the transmission distance.)
Port 1
Port 2
Equipment under test
Tx
Rx
Tx
Rx