Switch S1-8: Carrier Control Method
The setting for switch S1-8 determines whether the carrier is
“constantly on” or “controlled by RTS”. This setting allows for operation
in switched carrier, multipoint and/or hardware handshaking
applications.
S1-8
Setting
Off
Constantly on
On
Controlled by RTS
3.3 CONFIGURATION SWITCH SET “S2”
The DIP switches on S2 set word length, extended signaling rate,
RTS/CTS delay, V.52 and V.54 diagnostic test and 2- and 4-wire
operation.
Switches S2-1 and S2-2: Word Length
Switches S2-1 and S2-2 are set in combination to determine the
word length for asynchronous data.
S2-1
S2-2
Setting
Off
On
8 bits
On
On
9 bits
Off
Off
10 bits
On
Off
11 bits
7
S2 SUMMARY TABLE
Position
Function
Factory Default
S2-1
Word Length
Off
S2-2
Word Length
Off
S2-3
Extended Signaling Rate
Off -2.5% to 1%
S2-4
RTS/CTS Delay
On
S2-5
RTS/CTS Delay
On
S2-6
V.52/V.54 Tests
Off Normal Operation
S2-7
2-Wire/4-Wire
Off
(4-Wire)
S2-8
Not Used
N/A
}
}
7 ms
10 bits
Switch S2-3: Extended Signaling Rate
The setting for switch S2-3 determines the range of variability the
Model 1080A Series “looks for” in asynchronous data rates (i.e., the
actual variance from a given frequency level the Model 1080A Series
will tolerate).
S2-3
Setting
Off
-2.5% to +1%
On
-2.5% to +2.3%
Switches S2-4 and S2-5: RTS/CTS Delay
The combined settings for switches S2-4 and S2-5 determine the
amount of delay between the time the unit “sees” RTS and when it
sends CTS. Options are no delay, 7 ms and 53 ms.
S2-4
S2-5
Setting
On
On
7 ms
Off
On
53 ms
On
Off
No delay
Off
Off
No delay
Switch S2-6: V.54 Loopback Test Enable
To reset the V.54 circuit, set switch S2-6 to the “ON” position, then
back to the “OFF” position.
S2-6
Setting
Off
V.54 Normal Operation
On
V.54 Testing Disabled
Switch S2-7: 2-Wire/4-Wire Mode Selection
The setting for switch S2-7 determines whether the Model 1080A
Series is operating in 2-wire or 4-wire mode.
S2-7
Setting
Off
4-wire (full or half duplex)
On
2-wire (half duplex only)
8
