Magnum Personal Hubs Installation and User Guide (09/01)
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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 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
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.
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
cascading to hub or
concentrator. This port
us
er
(=
=)
u
plink (
X)
Personal Hub up-link switch
(H80A shown)
H80
Hub
Up-link
switch
