S2-1 and S2-2: RTS/CTS Delay
The combined settings for switches S2-1 and S2-2 determine the
amount of delay between the time the Model 1045RC “sees” RTS and
when it sends CTS. Options are no delay, 7 ms and 53 ms.
S2-1
S2-2
Setting
On
On
7 ms
On
Off
53 ms
Off
On
No delay
Off
Off
No delay
S2-3 and S2-4: Word Length
Switches S2-3 and S2-4 are set in combination to determine the
word length for asynchronous data.
S2-3
S2-4
Setting
Off
On
8 bits
On
On
9 bits
Off
Off
10 bits
On
Off
11 bits
S2-5: Extended Signaling Rate
The setting for switch S2-5 determines the range of variability the
Model 1045RC “looks for” in asynchronous data rates (i.e., the actual
variance from a given frequency level the Model 1045RC will tolerate).
S2-5
Setting
Off
-2.5% to +1% (normal)
On
-2.5% to +2.3% (extended)
S2-6: Asynchronous/Synchronous Mode
The setting for switch S2-6 determines whether the Model 1045RC
is in asynchronous or synchronous operating mode.
S2-6
Setting
On
Asynchronous*
Off
Synchronous
*Note: in asynchronous mode, the Clock Source must be set to
“Internal” (S1-5 = On, S1-6 = On)
7
S2-7: RS-232/V.35 Initiation of Local Analog Loopback Test
The setting for switch S2-7 determines whether or not the Model
1045RC’s local analog loopback test can be initiated by raising pin 18
on the RS-232 interface (pin N on the V.35 interface).
S2-7
Setting
On
RS-232/V.35 initiation enabled
Off
RS-232/V.35 initiation disabled
S2-8: RS-232/V.35 Initiation of Remote Digital Loopback Test
The setting for switch S2-8 determines whether or not the Model
1045RC’s remote digital loopback test can be initiated by raising pin 21
on the RS-232 interface (pin L on the V.35 interface).
S2-8
Setting
On
RS-232/V.35 initiation enabled
Off
RS-232/V.35 initiation disabled
3.1.3 CONFIGURATION JUMPER “JP3”
Jumper JP3 is used to set 2-wire or 4-wire operation. Figure 3
(below) shows the possible positions of the strap on its pegs. Please
note the orientation of the jumper on the PC board.
(continued)
8
Figure 5 Orientation of jumper JP3
Front of PC Board
Rear of PC Board
1
2
3
1
2
3
1
2
3
