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3.1.1 Switch Set S1
The configuration switches on S1 set clock source, RTS/CTS
delay, carrier control, loopback tests. The default settings are summa-
rized in the table above.
Switches S1-1 and S1-2: Clock Source
Switches S1-1 and S1-2 are set in combination to determine the
source of timing for the Model 1093.
S1-1 S1-2 Setting
On On Internal
On Off Receive recover
Off On External transmit clock
Off Off Not a valid setting
Switches S1-3: RTS/CTS Delay
Switches S1-3 is used in combination to determine the amount of
delay between the time RTS is activated and the 1093 activates the
CTS.
S1-3
Function
On Short delay (4-9 msec)
Off Long delay (33-71 msec)
Switch S1-4: LDL Control
Switch S1-4 determines whether the frontt panel switch can acti-
vate a Local Digital Loopback (LDL) diagnostic test.
S1-4 Function
On LDL Control Enabled
Off LDL Control Disabled
Switch S1-5: Carrier Control
The setting for switch S1-5 determines whether the carrier is “con-
stantly on” or “controlled by RTS”. This setting allows for operation in
switched carrier or hardware handshaking applications.
S1-5
Setting
On Controlled by RTS
Off Constantly ON
Switch S1-6: DTE Control of RDL
The setting for switch S1-6 determines whether DTE control of
remote-digital loopback test is enabled or disabled. If DTE control is
disabled, the RDL test can only be initiated by the front panel switch.
S1-6
Setting
On DTE control enabled
Off DTE control disabled
Switch S1-7: DTE Control of LAL
The setting for switch S1-7 determines whether DTE control of
local analog loopback test is enabled or disabled. If DTE control is dis-
abled, the LAL test can only be initiated by the front panel switch.
S1-7
Setting
On DTE control enabled
Off DTE control disabled
S1 SUMMARY TABLE
Position Function Factory Default
S1-1 Clock Source* On
S1-2 Clock Source* On
S1-3 RTS/CTS Delay On Short Delay
S1-4 LDL Off Disabled
S1-5 Carrier Control Off Constant
S1-6 DTE Control of RDL Off Disabled
S1-7 DTE Control of LAL Off Disabled
S1-8 V.54 Enable/Disable Off Enabled
*See Note in SWITCH SET S1 (Below) for X.21 Clock Sources
}
Internal
NOTE: When an X.21 QuickConnect™ module is installed in
one or both base units, one base unit
must
be configured for
receive recover clock source. The particular application will
dictate which unit must be configured for receive recover clock
source.