Front Panel; Rear Panel - 3Com 3C510510B User Manual

Front Panel

1
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.
2
Link Status LEDs
The Link Status LEDs correspond to the individual lobe ports located on
the front panel. Refer to the LED descriptions below:
3
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:
4
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).
5
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.
6
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.
7
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.
8
Packet LED
The Packet LED flashes GREEN when the unit detects MAC or data
packets.
9
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.
10
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.
11
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

12
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
13
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