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GS108T Smart Switch Software Administration Manual
B-4
Virtual Local Area Networks (VLANs)
v1.0, December 2007
Port-Based VLAN Example Configuration
This example demonstrates how the port-based VLANs work to meet your needs.
In this example, you create four new VLANS, you change the port membership for default
VLAN 1, and you assign port members to the four new VLANs:
1.
In the Basic VLAN Configuration screen (see
“Basic—VLAN Configuration” on page 4-9
),
create the following VLANs, each with a defined description:
–
A VLAN with VID 1. Enter the following description: IT.
–
A VLAN with VID 2. Enter the following description: Sales.
–
A VLAN with VID 3. Enter the following description: Market.
–
A VLAN with VID 4. Enter the following description: Account.
2.
In the VLAN Membership screen (see
“Advanced—VLAN Membership” on page 4-12
)
specify the VLAN membership as follows:
–
For the default VLAN with VID 1 (IT), remove all members except for port 7 and port 8.
(All ports were automatically assigned to the default VLAN.)
–
For the VLAN with VID 2 (Sales), specify the following members: port 1, port 2, port 3,
and port 8.
–
For the VLAN with VID 3 (Market), specify the following members: port 2, port 3, port 4,
and port 8.
–
For the VLAN with VID 4 (Account), specify the following members: port 5, port 6, and
port 8.
In this example, the specified VLANs and ports have the following functions:
•
For the VLAN with VID 1, port 7 is used by the IT department to monitor and control
activities on all other VLANs.
•
For the VLAN with VID 2, port 1 is used by the Sales department, port 2 connects to the
file archives, and port connects to the printer server.
•
For the VLAN with VID 3: port 4 is used by the Marketing department, port 2 connects to
the file archives, and port connects to the printer server. The file archives and the printer
server are shared with the Sales department,
•
For the VLAN with VID 4: port 5 and port 6 are used by the for Accounting department.
Its work is kept secret from other departments except for the IT department.
•
For all VLANs: port 8 provides Gigabit speed for an e-mail server and an Internet
connection and is accessible to all departments.
Page 127 / 140
GS108T Smart Switch Software Administration Manual
Virtual Local Area Networks (VLANs)
B-5
v1.0, December 2007
3.
With the VLAN configuration that you set up, the following situations produce results as
described:
•
If a packet comes in on port 1, it can go to ports 1, 2, 3, and 8, as these ports are the only ports
in the VLAN with VID 1. A Sales person who uses port 1 can access the Internet, send and
receive e-mail, and access the file archives and print server, but cannot access ports that are
assigned to the Marketing and Accounting departments.
•
If a Marketing person sends a broadcast message, the Sales and Accounting departments are
not affected by the message, because it does not go out on their ports. Only the Marketing
department and the IT group receive the broadcast message.
•
If an IT person sends a broadcast message, everyone receives it.
Page 128 / 140
GS108T Smart Switch Software Administration Manual
B-6
Virtual Local Area Networks (VLANs)
v1.0, December 2007
Page 129 / 140
Network Cabling
C-1
v1.0, December 2007
Appendix C
Network Cabling
This appendix provides specifications for cables used with a NETGEAR GS108T Gigabit Smart
Switch.
Fast Ethernet Cable Guidelines
Fast Ethernet uses UTP cable, as specified in the IEEE 802.3u standard for 100BASE-TX. The
specification requires Category 5 UTP cable consisting of either two-pair or four-pair twisted,
insulated copper conductors bound in a single plastic sheath. Category 5 cable is certified up to
100 MHz bandwidth. 100BASE-TX operation uses one pair of wires for transmission and the
other pair for receiving and for collision detection.
When installing Category 5 UTP cabling, use the following guidelines to ensure that your cables
perform to the following specifications:
•
Certification. Ensure that your Category 5 UTP cable has completed the Underwriters’
Laboratories (UL) or Electronic Testing Laboratories (ETL) certification process.
•
Termination method. To minimize cross-talk noise, maintain the twist ratio of the cable up to
the point of termination; untwist at any RJ-45 plug or patch panel should not exceed 0.5 inch
(1.5 cm).
Category 5 Cable
Category 5 distributed cable that meets ANSI/EIA/TIA-568-A building wiring standards can be a
maximum of 328 feet (ft.) or 100 meters (m) in length, divided as follows:
•
20 ft. (6 m) between the hub and the patch panel (if used)
•
295 ft. (90 m) from the wiring closet to the wall outlet
•
10 ft. (3 m) from the wall outlet to the desktop device
The patch panel and other connecting hardware must meet the requirements for 100 Mbps
operation (Category 5). Only 0.5 inch (1.5 cm) of untwist in the wire pair is allowed at any
termination point.
Page 130 / 140
GS108T Smart Switch Software Administration Manual
C-2
Network Cabling
v1.0, December 2007
Category 5 Cable Specifications
Ensure that the fiber cable is crossed over to guarantee link.
Table C-1
lists the electrical requirements of Category 5 UTP cable.
Twisted Pair Cables
For two devices to communicate, the transmitter of each device must be connected to the receiver
of the other device. The crossover function is usually implemented internally as part of the
circuitry in the device. Computers and workstation adapter cards are usually media-dependent
interface ports, called MDI or uplink ports. Most repeaters and switch ports are configured as
media-dependent interfaces with built-in crossover ports, called MDI-X or normal ports. Auto
Uplink technology automatically senses which connection, MDI or MDI-X, is needed and makes
the right connection.
Table C-1. Electrical Requirements of Category 5 Cable
Specifications
Category 5 Cable Requirements
Number of pairs
Four
Impedance
100 ± 15%
Mutual capacitance at 1 KHz
5.6 nF per 100 m
Maximum attenuation
(dB per 100 m, at 20° C)
At 4 MHz: 8.2
At 31 MHz: 11.7
At 100 MHz: 22.0
NEXT loss (dB minimum)
At 16 MHz: 44
At 31 MHz: 39
At 100 MHz: 32

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