Anrtisu Cell Master MT8212B, Руководство пользователя, Страница: 111 / 294

MEAS/DISP
Choosing MEAS/DISP in E1 mode causes the soft keys below to be displayed.
q
Setup
— Activates menus that are used to set BERT testing options.
q
Framing Mode
— Selects the framing mode to be used.
q
Auto — Automatically detects the received framing mode.
q
PCM30
— Sets the E1 framing mode to PCM30.
q
PCM30 CRC
— Sets the E1 framing mode to PCM30 with CRC.
q
PCM31
— Sets the E1 framing mode to PCM31.
q
PCM31 CRC
— Sets the E1 framing mode to PCM31 with CRC.
q
Back
q
Receive Input
q
Terminate
— Terminates the circuit under test with either 75 or 120
ohms. Terminate mode is used to test out of service or newly installed
E1 lines when there is no traffic data.
q
Bridged
— Bridged mode provides greater than 1 k W impedance to
test the in-service line by bridging the receiver input across E1 lines.
q
M20 dB
— Monitor mode adds 20 dB of gain, and is used
when the connection to the circuit under test is through a 20 dB pad.
q
Back — Returns to the previous menu.
q
Pattern
— Opens a list of available BERT patterns. Use the soft keys or
the Up/Down arrow key to highlight a pattern and press ENTER to select.
q
Line Coding
— Selects the line coding to be used.
q
HDB3
— High Density Bipolar. An E1 code in which bipolar viola-
tions are inserted if the user data contains more than three consecutive
zeros.
q
AMI
— Alternate Mark Inversion. A bipolar signal in which ones are
encoded as pulses with alternating polarity, and zeros are encoded as
zero amplitude.
q
More
q
Clock Source
— Selects the clock source.
q
Internal
— Uses the internal clock.
q
External
— The clock is recovered from the receiver signal.
q
Back — Returns to the previous menu.
q
Setup Error Insert
— Opens the error insert menu.
q
Bit
— Configures the unit to insert bit errors.
q
BPV
— Configures the unit to insert Bipolar Violations.
q
Framing Bits
— Configures the unit to insert framing bit errors.
q
RAI
— Configures the unit to send a Remote Alarm Indication
(yellow alarm).
q
AIS
— Configures the unit to send an Alarm Indication Signal
(blue alarm).
q
Back — Returns to the previous menu.
q
Impedance
— Sets the Tx and Rx impedance.
Chapter 2 Functions and Operations
2-87