Stackable Personal Hubs
Installation and User Guide (04/01)
6
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ST80 Personal Hubs fit easily into the workplace environment. They are
versatile enough to be table-top or shelf-mounted. Alternatively, the brackets included in
the package may be used to mount a single (un-stacked) unit on a wall or any suitable
vertical surface. All of the wiring connectors are in the same plane so that wiring space is
neat and minimal. The external power supply unit conveniently plugs into an AC wall
receptacle or power strip.
The ST80's RJ-45 ports support connection of up to eight workstations or other
network devices over full length 10BASE-T cable segments. Stackable Personal Hubs
operate in compliance with the IEEE 802.3 specification for repeater functionality to
perform signal amplification, re-timing of data packets, and regeneration of preamble bits
for each packet received. Consistent with IEEE 802.3 specifications, Stackable Personal
Hubs will detect collisions, extend collision fragments, and automatically partition and
re-connect individual ports in order to keep problems on one segment from causing
downtime elsewhere on the network.
Model ST80 Personal Hubs include per port LINK/TX and POL/RX LEDs, a
COLlision LED and a DC PWR LED, all conveniently located on the front of the unit.
The LINK/TX LED illuminates GREEN when functional link is detected on the port. It
is intermittently turned off as the port transmits a packet. The POL/RX LED
intermittently illuminates GREEN as the port receives packets. If improper polarity is
detected, the LED is steady GREEN (the ST80 automatically compensates for the
polarity reversal and resumes normal operation). If the port becomes partitioned, the
LINK/RX and POL/TX LEDs will blink alternately. The COL LED flashes YELLOW
whenever a transmit collision occurs on any of the ports.
Magnum ST80 Stackable Personal Hub
Ports 1 2 3 4 5 6 7 8
PWR AUI
IR
B1
IR
B
2
St
ack
E
na
ble
OF
F
O
N
UP-LINK
Front Ports
Status LEDs
Switchable
Up-Link Port
Up-Link Switch
Stack Enable
Switch
IRB
Connectors
AUI Port
Power Jack
10BASE2 (BNC) Port (ST80-B only)
Fiber (ST) PORT (ST80-F only)
BNC Internal
Termination Swtich
(ST80-B only)
