Specifications

TurboStack Series Hubs

The AT-TS24TRS repeats 10BASE-T signals according to IEEE 802.3 hub

speciﬁcations. In an eight-slot department concentrator, up to 181 ports

may be monitored (seven Slaves containing 24 10BASE-T station ports

each and one Master containing 12 10BASE-T station ports and one AUI

network port).

Note

The AUI network ports on multiple AT-TS24TRS or AT-TR24TS hubs in an

eight-slot department concentrator cannot be used because they reside on

the back panel of the hub and are blocked by the backplane.

You can expand the number of ports by stacking multiple AT-TS24TRS

hubs through the backplane connector, making a single logical hub.

Controllers The AT-TS24TRS hub uses an ATI proprietary multiple port hub

controller to retime and regenerate signals and communicate with the

network management software. The port status for each of the ports is

indicated by an LED display.

AT-TS24TRS Port Configurations

Network Port The AUI port on the AT-TS24TRS resides on the back panel and is used to

connect the hub to the network only in a standalone conﬁguration. In a

managed hub, the Master’s AUI port may be used for the network

connection. In a non-managed hub conﬁguration, if you are using a two- or

three-slot chassis, one AUI port is used for the network connection and the

remaining AUI port(s) can be used for station connections.

Different media connections can be accommodated through the use of an

ATI micro transceiver. For a list of the ATI micro transceivers available for

network connections, see Table 3 on page 19 of this manual.

Station Ports The AT-TS24TRS hub is factory built with 24 RJ45 connectors.

UTP Hub-to-MAU Wiring

For a 10BASE-T link between a hub and a Media Access Unit (MAU)

transceiver or Network Interface Controller (NIC), the cable is wired

straight-through. That is, an RJ45 receptacle at the hub would wire pin-

to-pin to the RJ45 receptacle at the MAU. The AT-TS24TRS follows IEEE’s

10BASE-T hub standard for an embedded crossover function. Each port is

an MDI-X interface with the receive and transmit pairs crossed internally.

Note

For information on UTP cabling, refer to the 10BASE-T section in

Appendix A.

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