9H423-26 Cabling Requirements
A-8
Per TIA/EIA 568A, 100
Ω
UTP cables and connecting hardware are rated into five
classifications: Category 1 through Category 5, based on transmission
characteristics and performance requirements. Refer to Table A-3.
Physical differences between the various classifications of cable attribute to better
performance. These include the actual conductor materials and twists per the
pairs.
To be qualified and verified as Category 5, there are certain transmission
parameters and restrictions placed upon the cable and connecting hardware that
are listed below:
•
DC Resistance - The resistance of any conductor cannot exceed 9.38
Ω
per 100
meters at 20˚C.
•
DC Resistance Unbalance - Between the two conductors in a pair, the resistance
unbalance cannot surpass 5%.
•
Mutual Capacitance - Voltages in one conductor create electric fields in the
other. They interact electrically. Thus consequently between the pairs, there is
mutual capacitance.
The mutual capacitance of any pair at 1 kHz and 20˚ C should not exceed
5.6 nF per 100 m for Category 4 and Category 5 cables. Category 3 cables
should not exceed 6.6 nF/100 m.
•
Capacitance Unbalance - The capacitance unbalance to ground of any pair
should not exceed 330 pF per 100 m at 1kHz.
•
Characteristic Impedance - All categories of horizontal UTP cables specified
herein have a characteristic impedance of 100
Ω
+/- 15%.
The measured input impedance will vary as a function of frequency due to the
structural non-uniformities of the cable. The fluctuations superimposed on a
curve asymptotically approaches a fixed value, namely the characteristic
impedance. The fluctuations in input impedance are related to the Structural
Table A-3. 100
Ω
UTP Cable Categories
Category (CAT)
Transmission Characteristics specified up to x MHz
CAT 1
Not rated
CAT 2
1 MHz
CAT 3
16 MHz
CAT 4
20 MHz
CAT 5
100 MHz
Summary of Contents for SmartSwitch 9000
Page 1: ...SmartSwitch 9000 9H423 26 User s Guide 9032242 02 ...
Page 2: ......
Page 30: ...Operation 3 10 ...
Page 34: ...LANVIEW LEDs 4 4 ...
Page 38: ...Specifications 5 4 ...