Hardware Description
2-11
Interconnecting Hubs via the AUI Port
The AUI port is typically used to interconnect hubs using a thick Ethernet
backbone, as illustrated in the figure below. It can also be used to interconnect
hubs using a variety of media, such as fiber optic, unshielded twisted-pair, or
broadband, depending on the external transceiver you connect to the port.
A common approach is using two TP-MAUs which may be connected by
attaching the Transmit pair of one MAU to the Receive pair of another MAU. As
you do this, the integrity of tip-to-tip and ring-to-ring polarity must be maintained.
Since the AUI port is 802.3 10Base5 compatible, you may use it according to
those specifications, paying special attention to maximum distance, number of
devices, and termination guidelines. See Table 3-1, “IEEE 802.3 Network
Specifications,” for guidelines. See Appendix C, “Pinouts and Cable
Specifications,” for details on cable construction.
!
Note: Make sure SQE (Signal Quality Error) is disabled
on the MAU (Media Access Unit) when it is attached to the AUI
Port.
RJ21 10 BASE-T PORTS
IN or
OUT
AUI
PARTITION
RS232
RS485
12
THROUGH
AMS LINK
UP=PC
DOWN=TERMINAL
END
3-IN-1 UPLINK
BNC
Spare Fuse in Fuse Holder
2A/250V Slow Blow Fuse
Replace Only With Fuse of Same Rating
TRAFFIC
AUI FOIRL MAU
FIBER
FIBER
Figure 2-5. Interconnecting Hubs using FOIRL (Fiber Optic Inter-Repeater Link)
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