Switches S2-1 and S2-2: Data Rate
Switches S2-1 and S2-2 are set in combination to determine the
synchronous data rate for the Model 1075.
S2-1
S2-2
Setting
Off
On
32 kbps
On
Off
56 kbps
On
On
64 kbps
Switches S2-3 and S2-4: System Clock Mode
The setting for switches S2-3 and S2-4 determines the transmitter
clocking mode for the Model 1075.
S2-3
S2-4
Clock Mode
Description
On
On
Internal System
clock
generated internally
On
Off
External (DTE)
System clock derived
from terminal interface
Off
On
Receive Recover
System clock derived
from the received line
signal.
Switch S2-5: Carrier Control
S2-5
Carrier
Description
Off
Always On
Transmitter is always ON
On
Follows terminal
Transmitter controlled by “Control”
signal from X.21DTE (or by
“Indication” signal from X.21 DCE)
Switches S2-6 and S2-7: Not Assigned
Switch S2-8: Front Panel Switch Enable/Disable
Switch S2-8 determines whether the front panel switches may be
used to perform diagnostic functions.
S2-8
Activation
Description
On
Enabled
Front panel switches may be used
to activate/terminate diagnostics.
Off
Disabled
Front panel switches will have no
effect on operation of the unit.
6
3.1.1 Configuration Switch Set “S1”
The switches on Switch S1 set V.54 Test Functions. Default
settings and detailed descriptions for each switch are shown below.
Switches S1-1 through S1-7: Not Assigned
Switch S1-8: V.54 Test Functions
Switch S1-8 enables or disables the Model 1075 V.54 loopback
test modes.
S1-8
Activation
Description
Off
Enabled
V.54 test functions enabled
On
Disabled
V.54 test functions disabled
3.1.2
Configuration Switch Set “S2”
The switches on Switch S2 set data rates, clock source, carrier
control and front panel switch operation. Default settings and detailed
descriptions for each switch are shown below.
S1 SUMMARY TABLE
Position
Function
Factory Default
S1-1 thru S1-7
Not Assigned
Off
S1-8
V.54 Test Functions
Off
Enabled
S2 SUMMARY TABLE
Position
Function
Factory Default
S2-1
Data Rate
On
S2-2
Data Rate
Off
S2-3
Clock Mode
On
S2-4
Clock Mode
On
S2-5
Carrier Control
Off
Forced On
S2-6
Not Assigned
Off
S2-7
Not Assigned
Off
S2-8
Front Panel Switches
On
Enabled
56 kbps
}
5
Internal
}
