AMERITECH AM8a, Инструкция по эксплуатации

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Configuration Parameters (18-0037) AM8a Instruction Manual
February 10, 2000 0037-S02.L_
2-2
2.2 CIRCUIT CONFIG
The Circuit Config menu allows the user to specify the characteristics of the trunk type to be
tested.
CIRCUIT:
CONFIG :
Alternate:
ANALOG IMPEDANCE
900 ohm
135 ohm
600 ohm
1200 ohm
ANALOG/PCM
pcm loop clk
analog
pcm int clk
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).