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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