Technical data

Chapter 18 525
T1 Analyzer
Measurement Results
T1 Analyzer
Isolating Faults Using Test Equipment:
Test equipment can be used to generate and monitor alarms and errors. Test
equipment is connected to the T1 facility in a variety of ways. Bantam jacks are
often available on the equipment. When the plug is inserted into the jack the circuit
is interrupted. Sometimes a monitor jack is available. When a plug is inserted into
the monitor jack the circuit is not interrupted and a –20 dB signal is available at the
jack. When none of these is available, the signal may be monitored at a connection
block, sometimes referred to as a “punch-down block”. The “T1 Facility Access
Methods” table below describes the three typical access methods.
T1 Facility Access Methods
Access method Test set configuration Notes
Test Jacks Terminated Circuit is broken when plug is inserted
into jack. The test equipment is normally
set to “Terminate” and provides 100 Ohm
termination.
Monitor Jacks Monitor The circuit is not interrupted when the
plug is inserted into the jack. The actual
signal is available at a level 20 dB lower
than the original. The test set normally set
to “Monitor” provides a 100 Ohm
termination and expects the signal to be
20 dB down from what is usually
expected.
Direct Connection to “Punch
Down Block”.
Bridged The circuit is not interrupted in this mode.
The test set impedance is greater than
1000 Ohms so that the circuit is minimally
affected. Test set is set to “Bridged”