3Com 3C250B-TX - SuperStack II Hub 100 Gebruikershandleiding - Pagina 2
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Category 3/Category 4/Category 5 UTP Cable Comparison
Category 5 UTP cable is the most common type of UTP cable in use today for data communications, such as for
10BASE-T Ethernet. Many installations, however, have some or all desktop PCs connected using Category 3 or
Category 4 UTP. The chart below compares these common cable types:
Cable Type
Manufac. Specs
Cat. 3 UTP
up to 20 MHz
Cat. 4 UTP
up to 33 MHz
Cat. 5 UTP
up to 100 MHz
100BASE-T4 Connector Pin Out
100BASE-T4 utilizes 4 pairs of wire in a Category
3, 4 or 5 UTP bundle. 100BASE-T4 connections
from a hub to a PC are normally straight-through
100BASE-T4 Recommended Usage
Specification Comparison:
Specification
100BASE-T4
100BASE-TX
100BASE-FX
Fast Ethernet switch
Common Prod.#
AT&T 1010/20100
AT&T 2001c/2001d
AT&T 1261/2261
AT&T 2014a
AT&T 1061
AT&T 2061
Advantages
-Category 3,4 UTP support
-Reliable in unknown UTP
environment
-Most common equipment type
-Support for full duplex
-Longer distances
-Fiber support
E-net/Fast E-net Distance
100 meters
100 meters
100 meters
100BASE-T4 Cable Pinout
Desktop
1
2
3
4
5
6
7
8
Note: Like 10BASE-T, 100BASE-T transmit/receive crossover
is in the hub. RJ-45 connectors are shown here.
Disadvantages
-No support for full duplex
-Requires 4 pairs in wire bundle -Mixed category 3/4/5 UTP environment
-No support for cat. 3 or 4 UTP
-Requires all components be
Cat. 5 certified
-Expensive
-Not common for PC or server
connections
E-net/F-enet spec.
10BASE-T(2 pairs)
100BASE-T4(4 pairs)
10BASE-T(2 pairs)
100BASE-T4(4 pairs)
10BASE-T(2 pairs)
100BASE-TX(2 pairs)
100BASE-T4(4 pairs)
Transmit (1 & 2)
Receive (3 & 6)
Bidirectional (4 & 5)
Bidirectional (4 & 5)
Bidirectional (7 & 8)
Recommended Usage
-Cat. 3 or 4 UTP PC or server connections
-Cat. 5 envir. w/ components of unknown quality
-Cat. 5 UTP PC or server connections
-Any connection which may use full duplex
Fast Ethernet
-Any fiber connection
-Long distance connections
Legend
10 Mbps UTP
100 Mbps UTP
100 Mbps Fiber
Hub
1
2
3
4
5
6
7
8