10-Port 100BASE-FX and 20-Port 10/100BASE-TX Fast Ethernet Layer 2 Switching Modules Quick Start Guide 11

Table 4 Mapping the 24-port GEN SFM and the 20-port FEN Switching Module to the 7-slot Chassis

 

 

20-port Switching

 

 

Chassis

Number of SFM

Module

SFM Backplane Port

SFM LED Numbers

Slot

Backplane Ports

Backplane Port

Numbers Assigned to

Assigned to Backplane

Number

Allocated to Slot

Numbers

Chassis Slot

Port Numbers

 

 

 

 

 

1

4; up to 2 can be

21

1

1

 

accessed by this

22

2

2

 

module

 

 

 

 

 

 

 

 

 

2

4; up to 2 can be

21

5

3

 

accessed by this

22

6

4

 

module

 

 

 

 

 

 

 

 

 

3

4; up to 2 can be

21

9

5

 

accessed by this

22

10

6

 

module

 

 

 

 

 

 

 

 

 

4

4; up to 2 can be

21

13

7

 

accessed by this

22

14

8

 

module

 

 

 

 

 

 

 

 

 

5

4; up to 2 can be

21

17

9

 

accessed by this

22

18

10

 

module

 

 

 

 

 

 

 

 

 

6

4; up to 2 can be

21

21

11

 

accessed by this

22

22

12

 

module

 

 

 

 

 

 

 

 

 

7

Reserved for an SFM

Not applicable

Not applicable

Not applicable

 

 

 

 

 

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3Com 100BASE-FX, 10/100BASE-TX quick start Up to 2 can be Accessed by this Module

100BASE-FX, 10/100BASE-TX specifications

3Com 10/100BASE-TX and 100BASE-FX are network technologies that played a pivotal role in the evolution of Ethernet networking. As part of the Fast Ethernet standard, these protocols allow for the transfer of data at high speeds, which has benefited various industries and residential environments.

10/100BASE-TX, often referred to simply as Fast Ethernet over twisted pair, can operate at both 10 Mbps and 100 Mbps speeds, providing flexibility for network installations. This dual-speed feature is facilitated through the use of Category 5 or higher twisted pair cabling. With the ability to automatically negotiate the optimal speed, 10/100BASE-TX allows devices to communicate effectively in diverse network environments, minimizing compatibility issues.

One of the standout characteristics of 10/100BASE-TX is its ease of installation. The use of twisted pair wiring—the same type often used for telephone lines—reduces complexity and lowers infrastructure costs. This technology also supports the use of various physical layer standards, making it adaptable for different network architectures. Power over Ethernet (PoE) capabilities are an added advantage, allowing both data and electrical power to be delivered via the same cabling, simplifying setups for devices like IP cameras and wireless access points.

On the other hand, 100BASE-FX represents Fast Ethernet over fiber optics, providing a different solution for high-speed networking. Operating at 100 Mbps, it is particularly suited for long-distance data transmission, capable of distances up to 2 kilometers using multimode fiber and up to 20 kilometers with single-mode fiber. This makes 100BASE-FX an ideal choice for interconnecting different buildings within a campus or for connecting remote offices.

In terms of technology, 100BASE-FX utilizes light waves to transmit data, resulting in lower attenuation and immunity to electromagnetic interference, a major advantage in environments with substantial electrical noise. This optical technology enhances security as fiber optics are inherently more difficult to tap into without detection.

Overall, both 3Com's 10/100BASE-TX and 100BASE-FX are significant in their contributions to networking technology. They offer unique features that cater to distinct networking needs, whether for short-range, flexible deployments using copper cabling or for long-distance, high-capacity deployments using fiber optics. Their continued relevance speaks to their robust design, versatility, and reliability in a rapidly evolving technological landscape.