หน่วยที่ 7

สอ่ื กลางการสง่ ขอ้ มูล

7.1 (Coaxial) 1. 50 (Coaxial) 2 75 1. (Twisted pair) 2 2. 3. 1. 2.2.

2- (Shielded Twisted Pair : STP) ()- (Unshielded Twisted Pair : UTP)

1.2.3.1.2.3. (Fiber Optic)

1. (Wireless Media) 2. (Infrared) 3. 1. 2. 3.7.2 1. :- Laptops,- (Low circuitry cost)- (Directionality of the beam)- IrDA (Infrared Data Association)- (high noise immunity) : (receiver)- (Transmitter)-

---2 . (Radio Wave) (Bluetooth) 33Bluetooth 2.4 GHz. ( ) 2.400 2.4835 GHz. 79

3 . (Microwave)1.2.3.4.

4. (Satellite) (Down Link)”System : GPS) (Global Positioning

1. 2. (Delay Time)7.3 1. – – – 2. –

–3.–4.–5.7.4 (Bandwidth) 1.

2. (Number of Receivers)3. (Transmission Impairments)4. (Interference)