Black Box Switch ServSwitch Wizard VGA (USB) User Manual download pdf (Page 37)

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Appendices

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Page 37

True Emulation is not necessarily required by other USB devices, which is why you will also find two enumerated circuits included

(shown in green within the block diagram) alongside the True Emulation feature (shown in blue). This allows those other USB

devices to operate at their highest speeds, without any intervention. The enumerated circuits benefit greatly from the USB Hubs

that are jointly used with the True Emulation system. Because they interface directly and permanently with each computer, they

help to stabilize the dormant links, making errors during enumeration much less likely.

The dual switching arrangement provides further ﬂexibility because the True Emulation and enumerated sections can be

switched in unison or independently of each other, as required. Thus, your various peripherals can operate with different

computers at the same time.

HOST

CONTROLLER

USB

KEYBOARD

OTHER USB

DEVICE

USB

MOUSE

USB

HUB

USB

HUB

USB

HUB

USB

HUB

EMULATION

ENGINE

Figure A-1. True Emulation functional block diagram. The emulated section of the switch is shown in blue and

handles only the keyboard and mouse. The green enumerated section of the switch handles other USB devices

and also uses the USB hubs to link with the computers.

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Black Box Switch ServSwitch Wizard VGA (USB) User Manual Page 37