Maintenance and Service Guide |
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
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.
