Connection & Configuration (18-0015) AM-48 Test Set
0015-S066-10
Note: The reading on the AM-48 display needs to be corrected
when the Impedance Adapter is used; see ¶7.41 for
instructions.
6.6 Configurations
There are three (3) basic AM-48 configurations to test 2-wire and 4-
wire telephone and data communication lines:
1. End-to-end - requiring two (2) AM-48’s
2. Loopback
3. Testing with responders
This paragraph describes the different configurations, explains how
they are used, and discusses the advantages and disadvantages.
Note: End-to-end and responder testing applies to either 2-wire or
4-wire. Loopback testing only applies to 4-wire.
End-to-end Testing . Measurements on telephone transmission lines
are usually made by applying an appropriate signal at one end of the
transmission line and then measuring the results at the other end of
the line. This configuration requires a test set at each end of the line
and is called “end-to-end” testing.
Figure 6-4 shows a 4-wire end-to-end configuration, making
measurements over a telephone network that normally connects two
(2) modems. Each AM-48 both sends and receives signals, sending a
signal over the <SND> pair of lines and measuring the signal received
over the <RCV> pair of lines.
End-to-end testing can also be done over 2-wire lines. The AM-48
on one end sends a signal, and the AM-48 on the other end measures
the received signal.
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