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10.4.0 2400 BPS INTEGRATED MODEM
10.4.1 Controls And Indicators
OPERATE Indicator
Shows that power is on. When the test/operate
switch is set on OPERATE, the OPERATE indicator
is on for a received mark signal and off for a
received space signal.
When the test/operate switch is set on test (T1, T3,
T 4), indicator turns off for 150 ms when an error
(space) is detected.
SIGNAL Indicator
When the test/operate switch is set on OPE RATE,
the SI GNAL indicator turns on with the 'data
carrier detected' interface line.
READY Indicator
When the test/operate switch is set on OPE RATE,
I
the READY indicator turns on with the 'data set
ready' interface line.
When the test/operate switch is set on test (T1-
T4), the READY indicator is off to alert the
operator that the modem is not ready for normal
operation.
When the test/operate switch is set on T3, this
indicator is off when the modem is not receiving
data.
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OPERATE SIGNAL
READY
TALK
8
DATA
TALK/DATA Switch
10-10
Signal Quality Meter
I
Indicates signal quality by a relative reading.
Low reading determined during equalization is
recorded for dedicated lines. Poor signal quality
drives reading up on dedicated or switched lines.
TRANSMIT/RECEIVE Equalizer Switches
These are the equalizer switches on a leased-line
modem. Only a multipoint tributary modem
has transmit equalization.
TRANSMIT EQUALIZER
RECEIVE EQUALIZER
15 ()
15
0
1
l~~@j: ,:~~0~:4
•
•
~6
lu
• • •
6
10
• • •
9
8
7
9
8
7
OPERATE
o
T40rQ\OTl
T3~T2
Test/Operate Switch
Normally set on DATA for all operations; set
to TALK when using the DAA handset. On
TALK, automatic answering is inhibited and
the modem ignores 'data terminal ready' if it is
up.
Normally set on OPERATE; set to one of the
test positions for problem determination. There
is a reset, but a switched network connection is
retained between OPERATE and T4 and T3.
Other changes cause reset. See the following test
descriptions.
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