Features (TOP of page)
10BASE-T Ports
(Top of page)
The Switch has 24 10BASE-T ports configured as MDIX (cross-over), which
provide a full 10Mbps bandwidth to attached endstations. Maximum segment
length is 100m (328ft) over grade 3, 4, or 5 twisted pair cable.
As these ports are configured as MDIX (cross-over), you need to use a cross-over
cable to connect to devices whose ports are MDIX-only. Most of the 10BASE-T
ports in 3Com devices are MDIX-only.
100BASE-TX Port
(Top of page)
The Switch has a single Fast Ethernet 100BASE-TX port configured as
MDIX (cross-over), which provides a 100Mbps connection to, for example,
a local server. Maximum segment length is 100m (328ft) over grade 5 twisted
pair cable. As this port is configured as MDIX (cross-over), you need to
use a cross-over cable to connect to devices whose ports are MDIX-only.
Most of the 100BASE-TX ports in 3Com devices are MDIX-only.
Plug-in Module
(Top of page)
A slot at the rear of the unit can take a Plug-in Module, providing
an additional high-speed port. This could be used, for example, to provide
a Fast Ethernet or Asynchronous Transfer Mode (ATM) backbone connection
to the rest of your network.
Transceiver Module
(Top of page)
A slot at the rear of the unit allows you to install any of the 3Com
10Mbps Ethernet Transceiver Modules. When a Transceiver Module is fitted,
port 1 automatically switches to become the Transceiver Module port. The
Transceiver Module can provide a 10Mbps link to the rest of your network.
Backbone Port
(Top of page)
The Switch allows you to specify any port to be a backbone port with
the following attributes: Addresses received on the port are not
stored in the Switch Database (the database which contains the device addresses
received by the Switch) Frames with unknown addresses received by
the Switch are forwarded to the port. A backbone port is typically used
to connect the Switch to the backbone of large networks. For information
about how to specify a backbone port for a new or initialized Switch, refer
to "Setting Up the Switch Unit". You can specify one backbone port
for each VLAN defined on the Switch. For more information about how to
specify a backbone port for a VLAN, refer to "Setting Up VLANs on the Switch".
Front View (Top of page)
10BASE-T Ports
The Switch has 24 10BASE-T RJ45 ports configured as MDIX (cross-over),
which provide a full 10Mbps bandwidth to attached endstations. The maximum
segment length is 100m (328ft) over category 3, 4, or 5 UTP cable. As these
ports are configured as MDIX (cross-over), you need to use a cross-over
cable to connect to devices whose ports are MDIX-only. Most of the 10BASE-T
ports in 3Com devices are MDIX-only.
100BASE-TX Port
The Switch has a single Fast Ethernet 100BASE-TX RJ45 port configured
as MDIX (cross-over), which provides a 100Mbps connection to, for example,
a local server. The maximum segment length is 100m (328ft) over category
5 UTP or STP cable. As this port is configured as MDIX (cross-over), you
need to use a cross-over cable to connect to devices whose ports are MDIX-only.
Most of the 100BASE-TX ports in 3Com devices are MDIX-only.
LED's on the desktop Switch
(Top of page)
| LED | Color | Indicates |
|---|---|---|
| TCVR | Yellow | Port 1 is a Transceiver Module fitted to the rear of the unit. |
|
Port Status LEDs (ports 1-24 and 26) |
||
| Packet | Yellow | Frames are being transmitted/received on the port. |
| Status | Green | Link is present; port is enabled. |
| Green flashing | Link is present; port is disabled. | |
| Off | Link is not present. | |
|
Plug-in Module Status LEDs (port 25) |
||
| Packet | Yellow | Frames are being transmitted/received on the Plug-in Module port. |
| Status | Green | Link is present; port is enabled. |
| Green flashing | Link is present; port is disabled. | |
| Green flashing
(long on, short off) |
Refer to the "SuperStack II Switch ATM OC-3c Module User Guide". | |
| Yellow | Plug-in Module has failed its Power On Self Test (if the MGMT LED is flashing yellow), or the agent software of the Plug-in Module is not installed correctly. | |
| Yellow flashing | Plug-in Module is not recognized. | |
| Off | Link is not present or Plug-in Module is not installed in the Switch. | |
|
Unit Status LEDs |
||
| Power | Green | Switch is powered-up. |
| MGMT | Green | Switch is operating normally. |
| Green flashing | Switch or Plug-in Module is either downloading or initializing (which includes a Power On Self Test). | |
| Yellow | Switch has failed its Power On Self Test. | |
| Yellow flashing | Plug-in Module has failed its Power On Self Test. | |
Back View
(Top of page)
Power Socket
(TOP of page)
The Desktop Switch automatically adjusts to the supply voltage. The
fuse is suitable for both 110V A.C. and 220-240V A.C. operation. Unit Serial
Number
Reset Button
(TOP of page)
Using the reset button simulates a power-off/on cycle. This has the
same effect as carrying out a reset via the VT100 interface; refer to "Resetting
the Desktop Switch".
Console Port
(TOP of page)
Connect a terminal to the console port to carry out remote or local
out-of-band configuration and management. The console port is set to auto-baud,
8 data bits, no parity, and 1 stop bit.
Plug-in Module Slot
(TOP of page)
Use this slot to install a Plug-in Module. The Module can be used to
provide a high speed link to the rest of your network. 3Com provides a
range of Plug-in Modules; contact your supplier for availability. When
a Plug-in Module is not installed, ensure the blanking plate is secured
in place.
Transceiver Module Slot
(TOP of page)
Use this slot to connect a Transceiver Module and provide a 10Mbps
link to the rest of the network. Port 1 is automatically switched from
the front 10BASE-T port to the Transceiver Module port when a Module is
installed. 3Com provides a range of Transceiver Modules; contact your supplier
for availability. When a Transceiver Module is not installed, ensure
the blanking plate is secured in place.
Ethernet Address
(TOP of page)
This label shows the unique Ethernet (or MAC) address assigned to the
unit.
Connecting Equipment to the Console Port (TOP of page)
The Switch console port settings are set to:
8 data bits
no parity
1 stop bit
The terminal connected to the console port on the Desktop Switch must be configured with the same settings. This procedure is described in the documentation supplied with the terminal. If you have enabled auto-configuration for the Desktop Switch, the terminal's line speed (baud rate) is detected automatically. Connection to the console port can be direct for local management, or through a modem for remote management. The maximum baud rate the auto-configuration detects is 19,200 baud.
Connecting a VT100 Terminal
(TOP of page)
To connect a VT100 terminal directly to the console port on the Desktop
Switch, you need a standard null modem cable:
1 . Connect one end of the cable to the console port on
the Desktop Switch, and the other to the con-sole port on the VT100 terminal.
2 . Ensure that your terminal is set to:
8 data bits
no parity
1 stop bit
If auto-configuration is enabled for the Switch,
the terminal's line speed (baud rate) is detected automatically.
Connecting a VT100
Terminal Emulator
(TOP of page)
1 . Ensure that the workstation is running a suitable terminal
emulation package. There are many avail-able; contact your local supplier
for further details.
2 . If you are using a PC, you need a null modem cable
with an appropriate connector. Connect one end of the cable to the workstation,
and the other end to the console port on the Desktop Switch.
3 . Ensure that your workstation is set to:
8 data bits
no parity
1 stop bit
If auto-configuration is enabled for the Switch,
the workstation's line speed (baud rate) is detected automatically.
Connecting a
Workstation Running SLIP
(TOP of page)
You can communicate with the Desktop Switch via the console port from
a workstation running SLIP (Serial Line Internet Protocol). In this way,
you can perform out-of-band management using Telnet or SNMP. Cables required
for this connection depend on the type of workstation you are using. You
must configure the workstation to run SLIP. Refer to the documentation
supplied with the workstation for more details. You must configure the
console port of the Desktop Switch to accept SLIP and set up the SLIP parameters
(address and subnet mask).
Using the VT100
Management Interface
(TOP of page)
The menu-driven user interface built into the Desktop Switch is known
as the VT100 or Local Management interface. The VT100 management interface
provides a forms-based structure with pre-defined security levels, enabling
access to be restricted to particular users. The Desktop Switch can support
up to four management user sessions concurrently (for example one console
port and three Telnet connections).
You can establish VT100 management communication with the Desktop Switch through two different interfaces:
The following sections describe how to get started if you want to use
an SNMP Network Manager to manage the Switch. It assumes you
are already familiar with SNMP management.
Hierarchy
Of Commands and screens
(TOP of page)
Logging On
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At the Logon screen displayed in Figure 3-2, enter your user name and
password (note that they are both case-sensitive): If you have been
assigned a user name and password, enter those details. If you are logging
on for the first time (after installation or initialization), use a default
user name and password to match your access requirements. The defaults
are shown in Table 3-1. If you are setting up the Switch for management,
we suggest that you log on first as admin.
| User Name | Default
Password |
Access Level |
|---|---|---|
| monitor | monitor | Monitor - this user can view, but not change all manageable parameters |
| manager | manager | Manager - this user can access and change the operational parameters but not special/security features |
| security | security | Security - this user can access and change all manageable parameters |
| admin | (no password) | Security - this user can access and change all manageable parameters |
Logon Screen
After Logging On
(TOP of page)
When you have successfully logged on to the Desktop Switch, the Main
Menu screen appears as shown in Figure "Main Menu screen". From here, you
can select the options needed to manage the unit. If you have installed
an ATM OC-3c Module into the Switch, the Main Menu screen contains an ATM
CONFIGURATION option. Access to options depends on the access level you
have been assigned. If you are a user with security access level, and are
using the management facility for the first time, we should
Main Menu Screen
Switch Management Setup (TOP of page)
The Management Setup screen allows you to configure IP, IPX, and SLIP parameters for the Desktop Switch. This screen also allows you to display screens for setting up the console port and traps. To access the Setup screen, from the Main Menu screen, select the MANAGEMENT SETUP option. The Setup screen is displayed, as shown in Figure, "Management Setup screen".
NOTE :- If you change some of the following parameters, the Switch must be reset for the change to take effect. Reset the Switch by selecting OK and pressing the Reset button on the rear of the unit. Refer to "Reset Button".
The screen shows the following:
Management Setup Screen
There are entries under the following four fields; one for each data
link layer protocol that can be used by IPX:
From the Main Menu, select USER ACCESS LEVELS. The User Access Levels
screen appears as shown in Figure 4-2, "User Access Levels screen". From
this screen you can access:
User Name Type in the name of this new user. The name can consist of
up to 10 characters and is case-sensitive.
Password Type in the password for this new user. The password can consist
of up to 10 characters and is case-sensitive. For security reasons, the
password is not displayed on screen.
Access Level Assign an access level for this new user, as follows:
Switch Management
Level
(TOP of page)
The Switch Management screen lets you:
Choose between managing a port, the unit,
or a VLAN
Display screens for setting up the Switch
Display a screen for managing the Switch Database
Display screens for managing resilient links
Display screens for managing STP
Display screens showing statistics
Setting up the switch Ports
(TOP of page)
From the Main Menu, select SWITCH MANAGEMENT. With the Switch
Management screen displayed, choose the management level Port. Choose the
appropriate port, then select the SETUP button. The Port Setup screen is
displayed as shown in Figure, "Port Setup screen".
Port ID 1 / 2 / 3 ... 24 / 25 / 26 If you choose to manage the
Desktop Switch at port level, enter the particular port number into this
field before selecting the next screen. Ports 1-24 are the 10BASE-T ports,
port 25 is the Plug-in Module port at the rear of the unit, and port 26
is the 100BASE-TX port.
The screen shows the following:
Switch Management Screen for Port Level
Port Setup Screen
Security
Enable / Disable When Security is enabled, the port enters single address
learning mode. The Switch removes any address currently stored in the Switch
Database against the port. The Switch then learns the source address from
the first packet it receives on the port since Security was enabled. Once
the first address is learnt, no other endstation is permitted to access
the network through the port. If an endstation with a different address
attempts to transmit packets onto the network through the port, the port
is automatically disabled and a trap is generated. The port remains disabled
until it is enabled from the Port Setup screen or via SNMP management.
Security is not available on backbone ports. If the port has been defined
as a backbone port, the Security field is not displayed.
Duplex Mode Half Duplex / Full Duplex / Unit Default This field allows you to specify the duplex mode of the port:
Setting Up the Switch Unit
(TOP of page)
With the Switch Management screen displayed, choose the management
level Unit, then select the SETUP button. The Unit Setup screen is displayed,
as shown in Figure "Unit Setup screen". The screen shows the following
Switch Management Screen Unit level
STATS Use this button to display statistics screens for the level
of management you have chosen (port or unit).
SDB Use this button to display the Unit Database View screen,
which is used to manage the Switch Database.
RESILIENCE Use this button to display resilient link management
screens for the level of management you have chosen (port or unit).
Unit Setup Screen
Unit Name This read-only field shows the type of device.
sysName This field takes its name from the MIB II System Group
object. You can edit the first 30 characters of this field to make the
name more meaningful. This name is displayed on the Main Banner when you
first access the VT100 screens, and is also accessible to an SNMP Network
Manager.
Forwarding Mode Fast Forward / Fragment Free / Store and Forward
/ Intelligent This field allows you to set the forwarding mode for the
Switch:
VLAN Configuration Mode
Port
(TOP of page)
AutoSelect This field allows you to specify how ports on the Switch
are placed in VLANs:
Port - The ports use Port VLAN Mode,
which means that they are manually placed in the required VLAN. This is
the default mode.
AutoSelect - The ports use AutoSelect
VLAN Mode, which means that they are automatically placed in the required
VLAN by referring to a VLAN Server database in 3Com's Transcend Enterprise
Manager software.
Switch Management Screen VLAN level
STP Use this button to display screens for managing Spanning
Tree Protocol (STP) information for the level of management you have chosen
(port or VLAN). STP is not supported over Asynchronous Transfer Mode (ATM).
Consequently, if you specify that you want to manage the Plug-in Module
and the Switch has an ATM OC-3c Module installed, the STP button is not
displayed.
SERVER Use this button to display the VLAN Server screen, used
for entering the IP address and community string of a VLAN server.
SETUP Use this button to display setup screens for the level
of management you have chosen (port, unit or VLAN).
NOTE :- Some of the information of this page has been obtained from the 3com website - www.3com.com