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Switch S1-4: Must be set to the ON position (Reserved).
Switch S1-5: Asynchronous/Sync Operation
Use switch S1-5 to configure the Model 1082 for async/sync operation.
Switch S1-5 must be set in the Off position. There is no other valid set-
ting.
Switches S1-6 and S1-7: System Clock Mode
Use Switches S1-6 and S1-7 to configure the 1082 or Model 1082/144
for internal, or receive recover clock mode.
S1-6
S1-7
On
On
Off
On
On
Off
Off
Off
Important
Switch S1-8: Response to RDL Request
Use Switch S1-8 to allow Model 1082 and Model 1082/144 to enter the
Remote Digital Loopback diagnostic test when requested to do so by the
far end Model 1082 or Model 1082/144. For example, when switch S1-8 is
set to "ON", it will enter RDL mode (See section 5.3, "Test Modes" on
S1-4
On
S1-5
Off
Clock Mode
Internal
External (DTE)
Receive Recover
Hardware Reset
A pair of Model 1082s communicate synchronously
across the twisted pair line connection. Therefore, you
must set these switches whether your application is
async or sync. For X.21 or Async applications, configure
one Model 1082 for internal clock mode and the other
Model 1082 for receive recover clock mode.
Setting
Reserved
Setting
Async/Sync
Description
System clock generated internally
System clock derived from termi-
nal interface
System clock derived from the
received line signal
11
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