3Com 3C510511B Manual del usuario - Página 3

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Front Panel

24 RJ45 Ports

These are shielded RJ45 data connectors. These lobe ports are for

connecting workstations or other hosts with either Unshielded (UTP) or

Shielded (STP) Twisted Pair wiring. These ports are data communication

ports only and cannot be used for any other purpose. The SuperStack II

Hub TR is available with either 12 or 24 ports.

NOTE:The LEDs on the front panel of the SuperStack II Hub TR

hubs indicate the status of the ports on the hub. Refer to the

LED Descriptions listed below for an explanation of the LED's

color.

Link Status LEDs

The Link Status LEDs correspond to the individual lobe ports located on

the front panel. Refer to the LED descriptions below:

Internetworking Port LED

The Internetworking Port LED corresponds to the RJ45 port on the back

panel of the SuperStack II Hub TR. See Item 14.

Refer to the LED Descriptions below:

Cascade LEDs

The Cascade LEDs correspond to the Cascade connectors on the back

panel. The status of the LED (GREEN, OFF, FLASH) reﬂects the status of

the cascade. Note that if the Roving RMON feature is enabled, the LEDs

ﬂash GREEN in all units that are NOT being probed. If the probe is active

in a hub, the LED remains ON (GREEN).

Trunk LEDs (RI/RO)

The Trunk LEDs indicate the status of the Ring In (RI) and Ring Out (RO)

ports on the optional Ring In/Ring Out module which plugs into the

back panel of the SuperStack II Hub TR hub. See Item 19.

Phantom LEDs

These LEDs indicate the status of the phantom current feature which

protects the network from main ring cable failures. Phantom current

must be ON when connecting to another 3Com Token Ring hub or

when connecting to an ONcore, ONsemble, ONline, IBM 8230, 8250, or

8260 hub with the Hub TR ONtrunk module. When connecting to Token

Ring hubs other than 3Com, be sure to connect the cable ﬁrst and then

switch Phantom to OFF. The switch to the left of the Phantom LEDs

toggles the settings between RI on, RO on, RI/RO on, and RI/RO off.

Press the button until you have the desired setting.

Status LEDs

Green

Indicates that the port is active and operational.

Yellow

Indicates that the port has been partitioned via the

management software.

Flashing

Indicates that the port is isolated via Zero Delay Lockout

Yellow

(ZDL) or Distributed Recovery Intelligence (DRI) features.

Off

Indicates that the port is inactive and not part of the ring.

Data Rate

These LEDs indicate the data rate of the hub. The switch toggles

between 4 and 16 Mbps. Press the button to change the data rate of

the hub. Refer to the descriptions below:

4—green when data rate is set to 4 Mbps.

16—green when data rate is set to 16 Mbps.

SuperStack II Hub TR hubs are designed with an auto speed feature

which sets each hub in the stack to the ring speed setting of the

topmost hub in the stack. The hub that is at the top of the stack will

change all hubs below on the cascade automatically. Take care when

adding a new hub to stack.

Packet LED

The Packet LED ﬂashes GREEN when the unit detects MAC or data

packets.

Error LED

The Error LED indicates the type and status of hard and soft errors

experienced on the hub.

Green—indicates a soft error on the ring.

Yellow—indicates a beacon or hard error on the ring.

Power LED

The Power LED lights GREEN indicates the AC power supply or RPS is

operating correctly. Flashing green indicates that the unit is powered by

an RPS that has a problem. If the LED is not lit and none of the ports

work:

Check the fuse located in the power cable plug.

MGMT LED

The Mgmt LED indicates the presence and status of management on the

hub or download attempted and failed/aborted. Refer to the

descriptions below:

Flashing Green—downloading, standby agent in this hub, or

invalid or no agent code.

Green—active agent in this hub.

Off—no agent in this hub.

Flashing Yellow—Distributed Recovery Intelligence (DRI) active.

Yellow—agent faulted, in self-test, or rebooting.

Flashing Green/Yellow—DRI halt.

Rear Panel

Power Source and Fuse

WARNING:

Ensure that the power supply is disconnected

before opening the fuse holder cover.

The SuperStack II Hub TR uses the following replacement fuse.

Fuse speciﬁcation: 250 volts - 4A Slo-Blo

To change the fuse, release the fuse holder by gently prying open the

cover with a small ﬂat-blade screwdriver. Slide out the fuse-holder

drawer and remove the fuse. Check the ﬁlament (thin wire inside the

glass tube) to see if it is broken. If the ﬁlament is broken, replace with

the appropriate fuse listed above. See the following ﬁgure.

Correct fuse location

Redundant Power System Socket

The Redundant Power System (RPS) socket provides an alternate power

source for the Hub TR. Connect only a 3Com RPS (#3C565047) to this

connector. Disconnect the AC plug when using the RPS. See the

Redundant Power System manual for installation instructions.

WARNING:

Use of any power supply other than 3Com

Redundant Power System violates the manufacturers warranty.

Spare fuse location -

DO NOT USE