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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
}