Black Box ACS235A, ACS236A manual Setting gain-control jumper bank JP8

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CHAPTER 4: Configuring the ACS236A

4.2.1REMOTE GAIN-CONTROL JUMPER BANK JP8

If you’ll be using automatic gain control (AGC) in your Extender system, leave the jumpers ON the right-handposts of each of the three pairs of JP8 jumper posts, as shown below. (This is the factory-default setting as well as the recommended setting.) But if you’ll be controlling the gain manually (see Section 6.2), which is necessary with VGA input and Sun output (see Section 4.1.1), move the jumper to the left-handposts of each of the three JP8 jumper-post pairs, as shown in

Figure 4-6.

When you have AGC selected, the Remote Module ignores the gain-control screwdials on its rear panel and automatically adjusts the gain of each of the three color signals, which is possible because each of the signals has the same white reference value (0.7 Vpp) that the Module can use for comparison. If the colors of the picture on your monitor still seem a little off, you can tweak them with the Remote Module’s brightness and contrast controls, in addition to any color controls on the monitor itself.

When AGC is turned off, the Remote Module’s gain-control screwdials become activated, and you can use them to control the gain of the corresponding colors. (Be aware that when you’re in this mode, chromatic aberrations can affect your display.) Adjust the gain and check your adjustments by either watching the monitor or, to get best results, by using an oscilloscope. See Section 6.2. As always, you can also use the Remote Module’s brightness and contrast controls. We don’t recommend that you turn AGC off unless (a) you are using VGA input with Sun output, or (b) you have a color problem that you can’t seem to solve by any other means.

Whichever way you set these jumpers, make sure that jumper JP3 in the Local Module is set the same way.

With AGC (factory default)

Without AGC

J8

Jumpers on left-hand posts

Jumpers on right-hand posts

Figure 4-6. Setting gain-control jumper bank JP8.

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Contents ACS235A ACS236A Welcome to the ServSwitchTM Family Servswitch Brand Fiber KVM Extenders RADIO-FREQUENCY Interference Statements Servswitch Brand Fiber KVM Extenders NOM Statement Contents Table of Contents Specifications CableSpecifications Temperature Introduction OverviewComplete Package Configuring the ACS235A Configuring for RGB VideoImportant Notes Jumper Settings Setting the Jumpers in the Local Module Optional Locations of the ACS235A Local Module’s jumpersSetting the VGA/RGB jumpers Setting VGA-to-RGB jumper JP2 Setting the Jumpers in the Remote Module Optional Locations of the ACS235A Remote Module’s jumpersSync-on-color jumpers and diodes Setting gain-control jumper bank JP8 Setting Vsync jumper JP9 Configuring the ACS236A Locations of the ACS236A Local Module’s jumpers Setting video-handling jumpers JP2 and JP10 Locations of the ACS236A Remote Module’s jumpers Setting gain-control jumper bank JP8 Setting Vsync jumper JP9 Installation Guidelines and Limitations for Attaching Equipment1 CPU Keyboard and Mouse Connecting a CPU or KVM Switch to the Local Module Installation Servswitch Brand Fiber KVM Extenders Installation Running Fiber Cable Between the Local and Remote Modules Connecting Power to the Local and Remote Modules Powering Up the Rest of the SystemOperation Interpreting the Remote Module’s 7-Segment DisplayOperation Servswitch Brand Fiber KVM Extenders Troubleshooting Things to Try FirstCalling Black Box Shipping and PackagingConnectors on Both Models Appendix a PinoutsConnectors on the ACS235A Pin Signal Direction Connectors on the ACS236A Signal PinSignal Direction Appendix B Rackmounting the Extender Figure B-1. The RMK235 Rackmount KitFigure B-2. The rackmount assembly RMK235 shown Customer Support Information Welcome to the ServSwitchTM Family Servswitch Brand Fiber KVM Extenders RADIO-FREQUENCY Interference Statements Servswitch Brand Fiber KVM Extenders NOM Statement Contents Table of Contents Specifications Specifications Connectors ACS236A Introduction Complete Package Configuring the ACS235A Important Notes Jumper Settings Setting the Jumpers in the Local Module Optional Setting the VGA/RGB jumpers Setting VGA-to-RGB jumper JP2 Setting the Jumpers in the Remote Module Optional Sync-on-color jumpers and diodes Setting gain-control jumper bank JP8 Setting Vsync jumper JP9 Configuring the ACS236A Locations of the ACS236A Local Module’s jumpers Setting video-handling jumpers JP2 and JP10 Setting the Jumpers in the Remote Module Optional Setting gain-control jumper bank JP8 Setting Vsync jumper JP9 Installation 1 CPU Keyboard and Mouse Connecting a CPU or KVM Switch to the Local Module Installation Servswitch Brand Fiber KVM Extenders Installation Running Fiber Cable Between the Local and Remote Modules Connecting Power to the Local and Remote Modules Operation Operation Servswitch Brand Fiber KVM Extenders Troubleshooting Calling Black Box Appendix a Pinouts Connectors on the ACS235A Pin Signal Direction Connectors on the ACS236A Signal Direction Appendix B Rackmounting the Extender Figure B-2. The rackmount assembly RMK235 shown Page