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Magnum Personal Hubs
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 Personal Hub will vary. According to Ethernet standards,
when an AUI cable is used to connect the Personal Hub directly to a backbone
transceiver, the maximum AUI segment length of 50m (165 ft.) is allowed. If the
Personal Hub is connected to a transceiver that has been cascaded from another
transceiver, the maximum AUI segment length is reduced by 6 meters (20 feet), for
every additional transceiver device cascaded from the original backbone
transceiver tap..
The AUI connector of the Personal Hub supports standard IEEE signals,
which are summarized in Table 3.4
Table 3.4 AUI Pin Assignments
Pin Function
Pin Function
1
Control In Circuit Shield
10
2
Control In Circuit A
11
3
Data Out Circuit A
12
4
Data In Circuit Shield
13
5
Data In Circuit A
14
6
Voltage Common
15
7
Control Out Circuit A
SHELL
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.
3.5
Switchable Up-Link Feature
Each Personal
Hub is equipped with
one switchable up-link
port, which eliminates
the need for a special
cross-over cable when
Personal Hub up-link switch
(H80A shown)
cascading to hub or
concentrator. This port
w w w
.
G arrettC om
.
com
Installation and User Guide (09/01)
Data Out Circuit B
Data Out Circuit Shield
Data In Circuit B
Voltage Plus (+)
Voltage Shield
Control Out Circuit B
Protective Ground
Up-link
switch
13
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