Specifications

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5.1.1 T
HE
T
EST
I
NDICATOR
The green Test LED is the LED closer to the LOOP switch. It lights to
indicate that V.52 or V.54 tests are running.
5.1.2 T
HE
E
RROR
I
NDICATOR
The red Error LED is the LED closer to the BERT switch. While the MFLD
is in test mode (the Test LED is lit), the Error LED glows red when bit errors
occur.
5.2 Test Switches
The Multi-Function Line Driver has two top-panel slide switches (shown in
Figure 5-1 on the previous page). During normal operation, these switches
should be in the center (“NORMAL”) position. You can move them to
different positions to trigger various tests (see Section 5.3).
5.3 V.54 and V.52 Diagnostic Tests
The Multi-Function Line Driver offers two V.54 test modes and two V.52 test
modes to evaluate the condition of the MFLDs and the communication link.
Both sets of tests can be activated physically from the top panel. The V.54 test
can also be activated from the RS-232 interface.
NOTE
V.54 and V.52 test modes on the Multi-Function Line Driver are available
for four-wire applications only.
CHAPTER 5: Operation and Diagnostics