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Configuration Parameters
2.2
CIRCUIT CONFIG
The Circuit Config menu allows the user to specify the characteristics of the trunk type to be
tested.
CIRCUIT:
ANALOG IMPEDANCE
CONFIG :
Alternate:
2.2.1 ANALOG IMPEDANCE: This parameter selects the termination used when connected to
an analog loop line.
2.2.2 ANALOG/PCM: This parameter allows the selection of direct analog operation or PCM
operation. (PCM will function on each voice channel according to the selections made
in the TRUNK CONFIG menus.
analog: Selects the analog input jack (LOOP T/R) for connection to the circuit.
pcm int clk: (Internal Clock) the AM8a will generate the clock for PCM framing
information. In this case, the AM8a acts as a "Master" via the PCM1 or PCM2 TX jack.
pcm loop clk: (External Clock) uses the PCM signal it receives to obtain framing data.
In this mode, the AM8a acts as a "Slave" via the PCM1 or PCM2 RX jack. For testing in
repeat (drop and insert) mode the PCM signal with the clock (framing data) must be
connected to the PCM1 RX jack. (Refer to 2.3.3).
February 10, 2000
(18-0037)
ANALOG/PCM
900 ohm
135 ohm
600 ohm
1200 ohm
2-2
AM8a Instruction Manual
pcm loop clk
analog
pcm int clk
0037-S02.L_
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