บทที่ 2 สื่อกลาง ... - mwit.ac.th

1 2 1. 2. 3. 30102 2 (Bandwidth) (Twisted pair Cable)

2 2 1 1 (Channel) (Amplifier) 5 6 (Repeater) 2 3 2 ) (Shielded Twisted Pair : STP) 2 1 : (Crosstalk) (Bandwidth) bps (bit per second) 30102 3 ) (Unshielded Twisted Pair.

3 UTP) 3 1 UTP UTP (Bandwidth) (Data Rate) CAT 1 Analog /Digital Very low < 100 Kbps 3 - 4 CAT 2 T-1, ISDN Digital < 2 MHz 2 Mbps 3 - 4 CAT 1 CAT 3 LANs Digital 16 MHz 10 Mbps 100 CAT 1 CAT 4 LANs Digital 20 MHz 20 Mbps 100 CAT 1 CAT 5 LANs Digital 100 MHz 100 Mbps 100 CAT 1 CAT 5e LANs Digital 100 MHz 100 Mbps 1000 Mbps(4 pair)

4 100 CAT 5 CAT 6 LANs Digital 200 MHz 1000 Mbps 100 CAT 7 LANs Digital 600 MHz 10 Gbps 100 2 3 30102 4 (Modular Plugs) RJ-45 RJ-11 RJ-45 RJ-45 4 RJ-11 2 12 UTP RJ-45 2 1.

5 2. 1. 2. 3. (Noise) RJ-45 Straight-through Switch HUB EIA/TIA 568B Crossover HUB to HUB , Switch To Switch Notebook EIA/TIA 568B EIA/TIA 568A 5 RJ-45 4 RJ-45 CAT 5e 30102 5 3 RJ-45 EIA/TIA 568A EIA/TIA 568B RJ-45 EIA/TIA 568A EIA/TIA 568B CABLE CABLE Pin Symbol Pair No.

6 Color Pair No. Color 1 TD+ Pair 3 ( )Pair 2 ( )2 TD- Pair 3 Pair 2 3 RX+ Pair 2 ( )Pair 3 ( )4 Not Assigned Pair 1 Pair 1 5 Not Assigned Pair 1 ( )Pair 1 ( )6 RX- Pair 2 Pair 3 7 Not Assigned Pair 4 ( )Pair 4 ( )8 Not Assigned Pair 4 Pair 4 6 RJ-45 (Coaxial Cable)

7 (Coaxial Cable) (Coax) " " (LAN) 1. 2. 30102 63. (PE) 4.

8 7 2 BNC 1. BNC (BNC Connector) 2. T (T Connector) 3. (Terminator) 2 1. (Thin Coaxial cable) - cm. - - 185 m.

9 - Computer Ethernet 10 Ethernet Topology BUS Bandwidth 10 Mbps 9 (Terminator) 8 BNC ( ) T ( ) 30102 72. (Thick Coaxial cable) - cm. - - 500 m. - (Backbone) (Fiber optic cable) 2 1. (Broadband Transmission) - (Guard Band) - - - Analog - - Cable TV 2.

10 (Baseband Transmission) - - - Half-duplex - LAN Digital - 4 1. 500 ( Thick coaxial cable) 2. 3. (Echo) 1. 2. 3. Connector (Fiber Optic Cable) (Fiber Optic Cable) 11 30102