Digital Cellular Telephones

Mobile Frequency Range (MHz)

Rx: 896-894

Tx: 824-849

ETACS:

Rx: 916-949, Tx: 871-904

NTACS:

Rx: 860-870, Tx: 915-925

NMT-450:

Rx: 463-468, Tx: 453-458

NMT-900:

Rx: 935-960, Tx: 890-915

Rx: 1805-1880

Tx: 1710-1785

Rx: 810-826

Tx: 940-956

Rx: 1429-1453

Tx: 1477-1501

Multiple Access Method

FDMA

FDMA

FDMA

TDMA/FDM

TDMA/FDM

Duplex Method

FDD

FDD

FDD

FDD

FDD

Number of Channels

AMPS: 832

NAMPS: 2496

ETACS: 1240

NTACS: 400

NMT-450: 200

NMT-900: 1999

374 (8 users/channel)

1600

(3 users/channel)

Channel Spacing

AMPS: 30 kHz

NAMPS: 10 kHz

ETACS: 25 kHz

NTACS: 12.5 kHz

NMT-450: 25 kHz

NMT-900: 12.5 kHz

200 kHz

25 kHz

Modulation

FM

FM

FM

GMSK

(0.3 Gaussian Filter)

pi/4 DQPSK

Channel Bit Rate

n/a

n/a

n/a

270.833 kb/s

42 kb/s