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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.
S1-1
S1-2
S1-3
S1-4 Rate (kbps) in miles (km)
On
Off
Off
On
On
Off
Off
Off
On
On
On
Off
Off
On
On
On
On
Off
On
Off
On
Off
On
On
Off
Off
On
Off
Off
Off
On
On
On
On
Off
On
Off
On
Off
Off
Off
Off
Off
On
Off
On
On
Off
Off
Off
Off
Off
On
On
Off
Off
Off
On
Off
On
On
On
On
On
7
Data
Max Distance
}
Async
0-19.2
3.0 (4.8)
Settings
0-38.4
1.5 (2.4)
2.4
1.5 (2.4)
}
9.6
3.0 (4.8)
14.4
1.5 (2.4)
19.2
3.0 (4.8)
28.8
1.5 (2.4)
38.4
3.0 (4.8)
Sync
48.0
3.0 (4.8)
Settings
56.0
1.5 (2.4)
64.0
3.0 (4.8)
72.0
1.5 (2.4)
128.0
1.5 (4.8)
144.0
1.5 (2.4)
192.0
1.5 (2.4)
256.0
1.5 (2.4)
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
On
Off
Internal
On
On
Internal
Off
On
External
Off
Off
Received Recover
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
8
Description
Transmit clock
generated internally
Transmit clock
generated internally
Transmit clock derived
from terminal interface
Transmit clock derived
from the received line
signal
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