Switch 8: Clocking Method
Switch 8 is used to specify the clocking method. The Model 1180
can provide an internal clock (pin 15) or receive an external clock (from
pin 24).
Switch 8
On = External Clock
Off = Internal Clock
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Switch 2
Switch 3
Switch 4
Switch 5
Data Rate
(Sync. Mode)
On
Off
Off
On
0 - 19.2 (2X)
Asynchronous
On
Off
Off
Off
0 - 38.4 (1X)
Asynchronous
On
On
On
Off
2.4 (1X)
Off
On
On
Off
9.6 (1X)
Off
On
On
On
9.6 (2X)
On
On
Off
Off
19.2 (1X)
On
On
Off
On
19.2 (2X)
Off
On
Off
Off
38.4 (1X)
Off
On
Off
On
38.4 (2X)
On
Off
On
Off
48.0 (1X)
On
Off
On
On
48.0 (2X)
Off
Off
On
Off
56.0 (1X)
Off
Off
Off
Off
64.0 (1X)
Off
Off
Off
On
64.0 (2X)
Off
Off
On
On
192.0 (1X)
On
On
On
On
256.0 (1X)
Switch 6: Reset
Switch 6 lets you reset the Model 1180 without powering down the
unit. The default position of the switch allows normal operation.
Switch 6
On = Reset Condition
Off = Operating Condition
Switch 7: Handshake Mode
The setting for switch 7 determines whether the Model 1180
operates in Control Signal Mode or Standard Modem Mode. In Control
Signal Mode, the two Model 1180s pass RTS/CTS and DTR/DSR
between each other over the fiber link. In Standard Modem Mode,
handshaking only occurs between each Model 1180 and its DTE, not
over the fiber link.
Switch 7
On = Control Signal Mode
Off = Standard Modem Mode
(continued)
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