ITU V.24协议说明（英文版）

The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC

Resolution No. 1 (Helsinki, March 1-12, 1993).

ITU-T Recommendation V.24, was revised by ITU-T Study Group 14 (1993-1996) and was approved by the WTSC

(Geneva, October 9-18, 1996).

1. In this Recommendation, the expression “Administration” is used for conciseness to indicate both a

telecommunication administration and a recognized operating agency.

2. The status of annexes and appendices attached to the Series V Recommendations should be interpreted as

follows:

ii Recommendation V.24 (10/96)

1 Scope.............................................................................................................................................................. 1

2 Line of demarcation ....................................................................................................................................... 2

3 Definitions of interchange circuits ................................................................................................................. 2

4 Operational requirements............................................................................................................................... 15

Reference................................................................................................................................................................... 19

Recommendation V.24

these two classes of equipment (see Figure 1).

FIGURE 1/V.24...[D01] = 8 CM

Electrical characteristics for interchange circuits are detailed in appropriate Recommendations for electrical charac-

teristics, or in certain special cases, in Recommendations for DCE.

In any type of practical equipment a selection will be made from the range of interchange circuits defined in this

Recommendation, as appropriate.

The actual interchange circuits to be used in a particular DCE are those indicated in the appropriate Recommendation.

The required interchange circuits specified in the DCE Recommendations which make reference to this

Recommendation apply only to the DCE side of the interface. Only those circuits necessary to assure satisfactory

operation of the application the DTE is intending to support need be controlled or monitored by the DTE. (See Note