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Switch S1-1 through S1-4
(Model 1185)
: Async/Sync Data Rate
On Model 1185 Switches S1-1, S1-2, S1-3 and S1-4 set two
parameters: synchronous or asynchronous data rate and the maximum
transmission distance between two Model 1185s.
Data Max Distance
S1-1
S1-2 S1-3 S1-4 Rate (kbps) in miles (km)
On Off Off On 0-19.2 3.0 (4.8)
On Off Off Off 0-38.4 1.5 (2.4)
On On On Off 2.4 1.5 (2.4)
Off On On On 9.6 3.0 (4.8)
On Off On Off 14.4 1.5 (2.4)
On Off On On 19.2 3.0 (4.8)
Off Off On Off 28.8 1.5 (2.4)
Off Off On On 38.4 3.0 (4.8)
On On Off On 48.0 3.0 (4.8)
Off On Off Off 56.0 1.5 (2.4)
Off Off Off On 64.0 3.0 (4.8)
Off On On Off 72.0 1.5 (2.4)
Off Off Off Off 128.0 1.5 (4.8)
On On Off Off 144.0 1.5 (2.4)
Off On Off On 192.0 1.5 (2.4)
On On On On 256.0 1.5 (2.4)
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Switches S1-5 and S1-6: Clock Source
Switches S1-5 and S1-6 are set in combination to determine Model
1184 and 1185 transmit clock source.
S1-5
S1-6 Setting Description
On Off Internal Transmit clock
generated internally
On On Internal Transmit clock
generated internally
Off On External Transmit clock derived
from terminal interface
Off Off Received Recover Transmit clock derived
from the received line
signal
NOTE: Because communication between two Model 1185s is
always synchronous, you must set these switches whether your
application is async or sync. For X.21 or Async applications,
please configure one unit for internal clock mode and the other for
receive recover clock mode.
Switch S1-7: DTE Control of DL
The setting for Switch S1-7 determines whether DTE control of
remote digital loopback test is enabled or disabled. If DTE control is
disabled, the DL test can only be initiated by the front panel switch. If
DTE control is not available, set switch S1-7 to the Off position.
S1-7
Setting Description
On Enabled Respond to DL requests from DTE
Off Disabled Ignore DL requests from the DTE
Switch S1-8: DTE Control of LAL
The setting for switch S1-8 determines whether DTE control of
local analog loopback test is enabled or disabled. If DTE control is
disabled, the LAL test can only be initiated by the front panel switch. If
DTE control is not available, set switch S1-8 to the Off position.
S1-7
Setting Description
On Enabled Respond to LAL requests from DTE
Off Disabled Ignore LAL requests from the DTE
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Async
Settings
Sync
Settings