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Maintenance and Service Guide 4-19
Addendum 108431-001 (11-88) to
Manual No. 108033-003
Modem
The Modem test runs a series of other tests that
verify the modem and interface cables.
The following selections are available:
□ Modem Internal Loopback
□ Auto Originate Mode
□ Auto Answer Mode
□ Modem External Termination
□ Modem Direct Connect
The following paragraphs describe these selec-
tions.
Modem Internal Loopback
The Modem Internal Loopback selection verifies
the TIP/RING (two wire) loopback circuitry
as well as the data transfer and bit error
rate circuitry.
Auto Originate Mode
The Auto Originate Mode selection verifies
that the modem subassembly can dial a remote
modem, establish the transmission line carrier,
check the transmission line quality, perform data
transfer, check bit error rate, and disconnect the
transmission carrier.
Auto Answer Mode
The Auto Answer Mode selection verifies that the
modem subassembly can receive an incoming
dial-up call, establish the transmission line
carrier, check the transmission line quality,
perform data transfer, check bit error rate, and
disconnect the transmission carrier.
Modem External Termination
The Modem External Termination selection
verifies that the TIP/RING (two wire) lines are
externally available.
NOTE: Before running this test, attach a modem
terminating plug.