2. 
Core)

3.  UTP
UTP
Plastic Cover)

4. EIA (Electronics Industries Association)
TIA (Telecommunication Industries Association)
EIA/TIA 568 UTP
Category N N
International Organization for Standardization)
Class A-F
Parameter dB CAT5 CAT5e CAT6
Minimum
Frequency 100 MHz 100 MHz 250 MHz
(
Attenuation
24 dB 24 dB 36 dB
(
NEXT ( 27.1 dB 30.1 dB 33.1 dB
PS-NEXT(
N/A 27.1 dB 33.2 dB
ELFEXT( 17 dB 17.4 dB 17.3 dB
PS-ELFEXT(
14.4 dB 14.4 dB 12.3 dB
ACR( 3.1 dB 6.1 dB -2.9 dB
PS-ACR( N/B 3.1 dB -5.8 dB
Return Loss(
8 dB 10 dB 8 dB
Propagation
548 nsec 548 nsec 546 nsec
Delay (
Delay Skew
50 nsec 50 nsec 50 nsec
(

5.  Category 1/Class A :
 Category 2/Class B : MHz
MHz
 Category 3/Class C : Mbps
 Category 4 : Mbps
 Category 5/Class D : Mbps
 Category 5 Enhanced (5e) : Cat 5
Mbps
 Category 6/Class E : Mbps
MHz
 Category 7/Class F : MHz

6.  UTP CAT3 LAN
IEEE 802.3 Mbps
CAT3
Fast Ethernet Mbps
UTP CAT5 Fast
Ethernet CAT3
LAN
Mbps UTP CAT5
UTP CAT5e
Mbps
Mbps

7.  UTP

UTP CAT3 UTP
4

PF
UTP
UTP
- MHz
UTP

8.  SRL UTP
f) CAT3 (dB) CAT4 (dB) CAT5 (dB)
1-10 MHz
21-10 log(f/10)
10-16 MHz 12-10 log(f/10) -
23
21-10 log(f/10)
16-20 MHz - -
23
23-10
20-100 MHz - -
log(d/20)
*f

9.  UTP
-
-
-
UTP
-

10.  STP
Shield)
UTP
STP UTP

11.  STP
- UTP
-
STP
-
- UTP

12. 





13.  http://www.kmitl.ac.th/~kpteeraw/data_com/dataco
m_52/html/utp.htm
 http://www.dcs.cmru.ac.th