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AM8a Instruction Manual
1.4
CONTROL ON/OFF KEYS
Additional control of configuration on the AM8a is available through ON/OFF function keys
on the lower left of the front panel. (See Figure 1-1.) The green LED indicates when the
function is ON. The following descriptions review the specific configuration control
provided:
1.4.1 INPUT ([SHIFT][*, KP]) Key: This key controls the AM8a connection to the selected line
being emulated or monitored. Connections are described in Section 6 along with
metering of circuits.
•
ON: the test set has full access to the lines selected; this is the standard condition.
•
OFF: all AM8a interfaces to the line jacks change to high impedance or open
circuits that will not interfere with the line under test.
NOTE: The OFF position is a built-in safety feature that prevents glitches during
any rearrangement of the external connections during AM8a configuration
changes. In addition, if certain trunk configuration parameters are
changed, INPUT is forced OFF.
1.4.2 TIMS ([SHIFT][#, ST]) Key: This key controls connection of a Transmission Impairment
Measurement Set (a TIMS such as the Ameritec AM5XT) to test the transmission
quality of the line. The TIMS is connected to the TIMS jacks on the front panel. The
key provides a three-position toggle.
NOTE: For PCM1 or PCM2, the TIMS jacks are connected internally to the selected
CHANnel. Refer to the Appendix that describes PCM operation.
•
1 (green LED ON): When on, the TX and RX circuitry in the AM8a is connected to
the TIMS 2W/TX and RX jacks. For 2W circuits or analog LOOP, the TIMS 2W/TX
jack is used. For 4W circuits, both jacks are used.
•
2 (green LED flashes): When in a monitor PCM mode, the TIMS jack RX and
TX/2W connections to the AM8a circuitry are reversed.
•
3 (green LED OFF): The TIMS jacks are Open and there is no connection to the
AM8a circuitry.
0037-S01.L_19
(18-0037)
1-9
Front Panel Operation
February 10, 2000
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