almanach modem
Modulator Demodulator

ITU-T	speed
V.21	300bps
V.22	1.200bps
V.22bis	2.400bps
	4.800bps
V.32	9.600bps
V.32bis	14.400bps
V.32terbo	19.200bps
V.34 (Vfast)	33.600bps
V.35	supports multi-link (throughput: xMBit/s= ykBit/s /8 *100 *lines)
V.90 (k56flex / X2)	33.600/56.000bps(up/down)
V.92	48.000/56.000bps(up/down)

data compression (MNP5, V42bis)
error control (V42, MNP4)

POTS plain old telephony system 300Hz-3.4kHz 56kBit/s
ISDN integrated service data network 0Hz-50kHz 144kBit/s
HDSL high bitrate DSL 0Hz-292kHz 2MBit/s
SDSL Symmetrical single pair DSL 0Hz-387kHz 2MBit/s
ADSL Asymmetric DSL 25kHz-138kHz 640kBit/s (up stream)
138kHz-1.1MHz 8MBit/s (down stream)
VDSL Very high bitrate DSL 200kHz-20MHz 52MBit/s

DSL driver RAS PPP over Ethernet Windows98/ME/NT/2000

MRDSL multi rate DSL

RA rate adaptive
SDSL, MRDSL/MDSL, HDSL-RA

WDM wave length multiplexing -2.5GBit/s
DWDM Dense wave length multiplexing
SDH Synchronous Digital Hierarchy

ITSP internet telephony service provider
PSTN public switched telephon network

serial, GeoPort, USB

UART

modulation (PAM [pulsed amplitude], CAP [carrierless amplitude], QAM [quadrature amplitude], DMT [discrete multitone])

AMR (audio modem riser)
ACRSiG (advanced communications riser - Special interest group)

AC97

GSM (900MHz [Europe] / 1800MHz [Europe] / 1900MHz [North America] / 850MHz [South America])
GSM 9.6KB max (w/ error correction), 14.4KB max (w/o error correction)
HSCSD (high speed circuit switched data) GSM channel bundling
GPRS (general packet radio service) max 171.2kBit/s (= 8 channels * 21.4kBit/s) currently only 4*13.4kBit/s available
EDGE (enhanced data rates for GSM evolution) max 473.6kBit/s (= 8 channels * 59.2kBit/s)
UMTS (universal mobile telecommunications system) 2MB max

W-CDMA (wideband code division multiple access) europe-asian type of UMTS