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Stackable Personal Hubs Installation and User Guide (04/01)
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The AUI port may also used for connecting to other Ethernet devices using
standard AUI cabling. In this type of situation, it is important to consider the AUI segment
length to the attached device, including any cascading.
The maximum transmission distance between a backbone transceiver and the AUI
port of the ST80 will vary. According to Ethernet standards, when an AUI cable is used to
connect the ST80 directly to a backbone transceiver, the maximum AUI segment length of
50m (165 ft.) is allowed. If the ST80 is connected to a transceiver that has been cascaded
from another transceiver, the maximum AUI segment length is reduced. See the following
note.
Important Note:
The maximum transmission distance is decreased by 6m (20
ft.) for every additional level of network transceiver device "dropped" or
"cascaded" from the original backbone transceiver tap.
The AUI connector of the Stackable Personal Hub supports standard IEEE signals,
which are summarized in Table 3.5
Table 3.5 AUI Pin Assignments
Pin Function Pin Function
1 Control In Circuit Shield 10 Data Out Circuit B
2 Control In Circuit A 11 Data Out Circuit Shield
3 Data Out Circuit A 12 Data In Circuit B
4 Data In Circuit Shield 13 Voltage Plus (+)
5 Data In Circuit A 14 Voltage Shield
6 Voltage Common 15 Control Out Circuit B
7 Control Out Circuit A SHELL Protective Ground
8 Control Out Circuit Shield (conductive shell)
9 Control In Circuit B
NOTES: 1) Voltage Plus (pin #13) and Voltage Common (pin # 6) use a single
twisted pair in the AUI cable.
2) Pins 4, 8, 11 and 14 may be connected to pin #1.