Keysight N7731A/C Switch
Avoid damaging the inputs of DCA-M modules. The front panel of many optical switches list the maximum power above which the switch is damaged. Be aware that the switch's maximum power level may far exceed the maximum safe power limits to DCA-M module inputs. Never exceed the maximum power level shown on the DCA-M module's front panel.
Keysight N7731A/C Switch IDs
Because each of the N7731A/C's switches only has one output which must be connected to a DCA-M, an output is unavailable to a demultiplexer, impairment, or user instrument.
| Front Panel | ||||
|---|---|---|---|---|
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| Switch 1 Ports | Switch 2 Ports | |||
| Front Panel Label | Ports 1 through 4 | A | Ports 1 through 4 | A |
| Port Function in FlexOTO | Inputs From | Outputs To | Inputs From | Output To |
| DCA-M Modules | ● | ● | ||
| Fixtures | ● | ● | ||
| Demultiplexers | ||||
| Impairments | ||||
| User Instruments | ||||
| Color definitions in table: | ||||
| Switch ports that FlexOTO considers to be switch inputs. | ||||
| Switch ports that FlexOTO considers to be switch ouputs. | ||||
| Hardware Diagram Switch Blocks | Switch Setup Dialog (To open, click on Switch Block) |
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Switch drawings are representative examples as switch models often come in different configurations. FlexOTO supports other module/switch configurations that are not shown. For example, you may be using a DiCon GP750 that has different installed modules. The basic concepts still apply.
The number of fixtures tested, lane counts, and DCA-M channels all consume available switch ports. In the Available Port Connections table above, equipment shown as available may in fact be unavailable due to situations in which all available ports are already assigned. In these situations, you may be able to free up switch ports by using only one DCA-M channel or deleting a user instrument, impairment, or multiple fixtures. Of course, switches with more ports provide more flexibility.
Example Setups
These examples show that when testing a 4-lane DUT Fixture, there is not enough ports to test more that one DUT at a time. However, with 2-lane DUT Fixtures, you can cascade the internal switches which allows you to test three DUT Fixtures.
Example 1. Four Lane DUT Fixture using Switch 1
Example 2. Three 2-Lane DUT Fixtures with Cascaded Internal Switches
