|
Anzeige
|
Frage zu den Datenströmen bei der Verwendung von USB-Hubs
Gast
#7204441
iVier Geräte hängen an einem USB-Hub. Der dann am PC. Sagen wir mal Maus, Tastatur, Drucker und ein RS232-Konverter. Die ersten drei werden ja vom Betriebssystem verwendet und meinetwegen mittels Terminal-Programm der RS232-Konverter. Frage zu dem Datenströmen. Bekommen die vier Geräte die Datenströme von und zu den anderen Geräten mit? Die für eine andere ID werden verworfen. Oder werden die vom USB-Hub sauber auseinandergehalten? Jefe
Gast
#7204445
Man sollte es USB Switch nennen. https://en.wikipedia.org/wiki/USB_hub > During normal transmission, hubs are essentially transparent: data received from its upstream port is broadcast to all devices attached to its downstream ports (pictorially described in the USB 2.0 specification in Figure 11–2, Hub Signalling Connectivity). Data received from a downstream port is generally forwarded to the upstream port only. This way, what is sent by the host is received by all hubs and devices, and what is sent by a device is received by the host but not by the other devices (an exception is resume signalling). Downstream routing has been changed in USB 3.0 with the addition of Point to Point routing: A route string sent in the packet header allows a USB 3.0 host to only send a downstream packet to a single destination port, decreasing congestion and power consumption.[12] > Hubs are not transparent when dealing with changes in the status of downstream ports, such as insertion or removal of devices. In particular, if a downstream port of a hub changes status, this change is dealt with in an interaction between the host and this hub; with any hubs between the host and "changed hub" acting as transparent. Antwort schreiben |
Anzeige
|
