NETGEAR FWG114P Router Manual PDF (Setup & Configuration Guide)

Page 206 / 296 Scroll up to view Page 201 - 205

Reference Manual for the ProSafe Wireless 802.11g

Firewall/Print Server Model FWG114P v2

B-12

Networks, Routing, and Firewall Basics

201-10301-02, May 2005

.

Category 5 Cable Quality

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.

A twisted pair Ethernet network operating at 10 Mbits/second (10BASE-T) will often tolerate low

quality cables, but at 100 Mbits/second (10BASE-Tx) the cable must be rated as Category 5, or

Cat 5, by the Electronic Industry Association (EIA). This rating will be printed on the cable jacket.

A Category 5 cable will meet specified requirements regarding loss and crosstalk. In addition,

there are restrictions on maximum cable length for both 10 and 100 Mbits/second networks.

Table B-1.

UTP Ethernet cable wiring, straight-through

Wire color

Signal

1

Orange/White

Transmit (Tx) +

2

Orange

Transmit (Tx) -

3

Green/White

Receive (Rx) +

4

Blue

5

Blue/White

6

Green

Receive (Rx) -

7

Brown/White

8

Brown

Page 207 / 296

Reference Manual for the ProSafe Wireless 802.11g

Firewall/Print Server Model FWG114P v2

Networks, Routing, and Firewall Basics

B-13

201-10301-02, May 2005

Inside 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.

Figure B-1

illustrates straight-through twisted pair cable.

Figure B-1:

Straight-Through Twisted-Pair Cable

Figure B-2

illustrates crossover twisted pair cable.

Figure B-2:

Crossover Twisted-Pair Cable

Page 208 / 296

Reference Manual for the ProSafe Wireless 802.11g

Firewall/Print Server Model FWG114P v2

B-14

Networks, Routing, and Firewall Basics

201-10301-02, May 2005

Figure B-3:

Category 5 UTP Cable with Male RJ-45 Plug at Each End

Note

: Flat “silver satin” telephone cable may have the same RJ-45 plug. However, using telephone

cable results in excessive collisions, causing the attached port to be partitioned or disconnected

from the network.

Uplink Switches, Crossover Cables, and MDI/MDIX Switching

In the wiring table above, the concept of transmit and receive are from the perspective of the PC,

which is wired as Media Dependant Interface (MDI). In this wiring, the PC transmits on pins 1 and

2. At the hub, the perspective is reversed, and the hub receives on pins 1 and 2. This wiring is

referred to as Media Dependant Interface - Crossover (MDI-X).

When connecting a PC to a PC, or a hub port to another hub port, the transmit pair must be

exchanged with the receive pair. This exchange is done by one of two mechanisms. Most hubs

provide an Uplink switch which will exchange the pairs on one port, allowing that port to be

connected to another hub using a normal Ethernet cable. The second method is to use a crossover

cable, which is a special cable in which the transmit and receive pairs are exchanged at one of the

two cable connectors. Crossover cables are often unmarked as such, and must be identified by

comparing the two connectors. Since the cable connectors are clear plastic, it is easy to place them

side by side and view the order of the wire colors on each. On a straight-through cable, the color

order will be the same on both connectors. On a crossover cable, the orange and blue pairs will be

exchanged from one connector to the other.

Page 209 / 296

Reference Manual for the ProSafe Wireless 802.11g

Firewall/Print Server Model FWG114P v2

Networks, Routing, and Firewall Basics

B-15

201-10301-02, May 2005

The FWG114P v2 Wireless Firewall/Print Server incorporates Auto Uplink

TM

technology (also

called MDI/MDIX). Each LOCAL Ethernet port will automatically sense whether the Ethernet

cable plugged into the port should have a normal connection (e.g. connecting to a PC) or an uplink

connection (e.g. connecting to a router, switch, or hub). That port will then configure itself to the

correct configuration. This feature also eliminates the need to worry about crossover cables, as

Auto Uplink

TM

will accommodate either type of cable to make the right connection.

Page 210 / 296

Reference Manual for the ProSafe Wireless 802.11g

Firewall/Print Server Model FWG114P v2

B-16

Networks, Routing, and Firewall Basics

201-10301-02, May 2005

Rate

Popular NETGEAR Models

Famous Router IPs

Famous Router Companies

Bookmark Our Site

Share