User's Manual

CCITT RECOMMENDATIONS
V.8 Method for initiating a data transfer with the best modulation possible
V.21 300 bps, full-duplex, synchronous and asynchronous, 2-point
Frequency Shift Keying
V.22 1200 bps with Fallback to 600 bps, full-duplex, synchronous and
asynchronous 4-point Frequency Shift Keying
V.22bis 2400 bps with Fallback to 1200 bps, full-duplex, synchronous and
asynchronous 16-point Quadratic Amplitude Modulation
V.23 1200/1200 bps in 4-wire operation, 1200/75 bps in 2-wire operation,
600/600 bps in 4-wire operation, 75/1200 bps in 2-wire operation,
75/600 bps in 2-wire operation, 75/75 bps in 2-wire operation,
synchronous and asynchronous, Frequency Shift Keying
V.24 List of definitions for interface cabling between Data Terminal
Equipment (DTE) and Data Communication Equipment (DCE)
V.25 Automatic Call-Answering Equipment and/or Parallel Dialing
Equipment in the public telephone dialing system, using 200 Group
interface cabling
V.25bis Automatic Dialing and/or Call-Answering Equipment in the public
telephone dialing system, using 100 Group interface cabling
V.26 2400 bps with Fallback to 1200 bps, 4-wire dedicated line, 4-phase
differential modulation
V.26bis 2400 bps with Fallback to 1200 bps, dialing line operation, half-
duplex, synchronous, 4-phase differential modulation
V.26ter 2400 bps with Fallback to 1200 bps, dialing and 2-wire dedicated line
operation with echo elimination, full-duplex, synchronous, differential
phase modulation
V.27 4800 bps with Fallback to 2400 bps, 4-wire dedicated line operation,
8-phase differential modulation, synchronous, half/full-duplex
V.27bis 4800 bps with Fallback to 2400 bps, full or half-duplex in 4-wire,
dedicated line operation, 8-phase differential modulation at 4800
bps; 4-phase differential modulation at 2400 bps
V.27ter 4800 bps with Fallback to 2400 bps, dialing line operation, half-
duplex; with 8-phase differential modulation at 4800 bps and 4-
phase differential modulation at 2400 bps.
V.28 Definition of the electrical characteristics of so-called non-
symmetrical polar lines
V.29 9600 bps, dedicated line operation; Fallback to 7200 or 4800 bps.
16-point quadratic amplitude modulation
V.32 9600, 4800 and 2400 bps with Fallback to 4800 bps dialing line;
synchronous and asynchronous, echo suppression; 16/32-point
quadratic amplitude modulation; differential Trellis Coding and/or
non-redundant coding, full-duplex
V.32bis 9600, 4800 and 2400 bps with Fallback to 4800 bps
Appendix-2 TECHNICAL INFORMATION