ATS-5X User Manual
Page 19 of 44
2.6
Equipment Connection
The ATS-5X has a differential transmitter with a two terminal jack and a receiver with the same configuration. When
Interface
is specified as 2-wire in the
Setup
screen, the internal receiver is connected to the transmitter jacks and the
receiver jacks are not used (see Figure 21). When
Interface
is specified as 4-wire, the receiver is connected to the
receiver jacks and both sets of jacks are used for testing (see Figure 20).
The ATS-5X can be used for in-service tests, end-to-end tests or loop tests. However, there are some special setup
considerations for some ATS-5X functions.
2.6.1
Longitudinal Balance
The longitudinal balance measurement applies a common mode signal to the tip and ring of the transmitter relative to
the reference jack. When using the longitudinal balance measurement, the reference jack should be connected to a
potential for which balance is to be measured. In most cases, this is simply ground or the cable shield. For all other ATS-
5X measurements, the reference jack should not be connected. The source impedance of the transmitter is fixed at
365Ω nominal for both the tip and ring connections.
The longitudinal balance is computed from two separate measurement configurations. The first measurement
configuration has the circuit under test connected to the tip and ring of the ATS-5X transmitter jack as shown in
Error!
Reference source not found.
. The second measurement configuration requires the circuit under test to be connected to
the ATS-5X transmitter jack in reverse fashion, as shown in Figure 25.
The longitudinal balance measurement should be conducted on a circuit that is not in service and with the far-end
equipment is not generating any signal near the test frequencies of the ATS-5X.
Figure 24 – Longitudinal Balance Setup – Step 1 (Normal Connection)
TIP
RING
Transmitter
Z
Tx
Z
REF
ATS-5X
Rx
TIP
RING
Receiver
Terminating
Equipment
Shield or Ground
