M57 电子系统工程 标准查询与下载



共找到 131 条与 电子系统工程 相关的标准,共 9

The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (ITU).

Intelligent Network User's Guide for Capability Set 1 Study Group 11

ICS
CCS
M57
发布
1994-04-01
实施

This Recommendation provides a glossary of terms and definitions which have been studied for application in the documentation of intelligent networks. These terms will also be incorporated in Recommendation Q.9, Vocabulary of Switching and Signalling Term

(WITHDRAWN) Glossary of Terms Used in the Definition of Intelligent Networks - General Recommendations on Telephone Switching and Signalling; Intelligent Network (Study Group XI) 11 pp

ICS
CCS
M57
发布
1993-03
实施

The ITü Telecommunication Standardization Sector (ITü-T) is a permanent organ of the International Telecommunication Union. The ITü-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to

Simulated Carrier Control - Data Communication over the Telephone Network (Study Group XVII) 5 pp

ICS
CCS
M57
发布
1993-01-01
实施

In general, the electrical characteristics specified in this Recommendation apply to interchange circuits operating at data signalling rates up to 75 bit/s, which have been covered in Recommendation V.31, and also to interchange circuits operating at data

ELECTRICAL CHARACTERISTICS FOR SINGLE-CURRENT INTERCHANGE CIRCUITS USING OPTOCOUPLERS

ICS
35.200
CCS
M57
发布
1988
实施

In general, the electrical characteristics specified in this Recommendation apply to interchange circuits operating at data signalling rates up to 75 bit/s.

ELECTRICAL CHARACTERISTICS FOR SINGLE-CURRENT INTERCHANGE CIRCUITS CONTROLLED BY CONTACT CLOSURE

ICS
35.200
CCS
M57
发布
1988
实施

In general, the electrical characteristics specified in this Recommendation apply to interchange circuits operating at data signalling rates up to 75 bit/s, which have been covered in Recommendation V.31, and also to interchange circuits operating at data signalling rates up to 1200 bit/s. The electrical characteristics are specified to provide compatibility with existing equipment according to Recommendation V.31 which meet the voltage and current values given in Table 1/V.31 bis. The resistance values defined in Recommendation V.31 are converted into current and voltage values to meet the optocouplers requirements. Each interchange circuit consists of two conductors (go and return leads) which are electrically insulated from each other and from all other interchange circuits. A common return lead can be assigned to several interchange circuits of a group.

ELECTRICAL CHARACTERISTICS FOR SINGLE-CURRENT INTERCHANGE CIRCUITS USING OPTOCOUPLERS

ICS
CCS
M57
发布
1988
实施

In general, the electrical characteristics specified in this Recommendation apply to interchange circuits operating at data signalling rates up to 75 bit/s, which have been covered in Recommendation V.31, and also to interchange circuits operating at data signalling rates up to 1200 bit/s. The electrical characteristics are specified to provide compatibility with existing equipment according to Recommendation V.31 which meet the voltage and current values given in Table 1/V.31 bis. The resistance values defined in Recommendation V.31 are converted into current and voltage values to meet the optocouplers requirements. Each interchange circuit consists of two conductors (go and return leads) which are electrically insulated from each other and from all other interchange circuits. A common return lead can be assigned to several interchange circuits of a group.

ELECTRICAL CHARACTERISTICS FOR SINGLE-CURRENT INTERCHANGE CIRCUITS USING OPTOCOUPLERS

ICS
CCS
M57
发布
1988
实施

When a call cannot find a free circuit in one group of circuits (first choice),technical arrangements can be made to route the call automatically via another group of circuits (second choice),at the same exchange;this process is called overflow.There may also be overflow,at the same exchange,from a second choice group of circuits to a third choice group of circuits,etc.

Overflow - alternative routing - rerouting - automatic repeat attempt

ICS
CCS
M57
发布
1988
实施

ITU-T Recommendation I.231.1 was published in Fascicle III.7 of the Blue Book. This file is an extract from the Blue Book. While the presentation and layout of the text might be slightly different from the Blue Book version,the contents of the file are identical to the Blue Book version and copyright conditions remain unchanged (see below).2 In this Recommendation,the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency.

CIRCUIT-MODE BEARER SERVICE CATEGORIES – CIRCUIT-MODE 64 kbit/s UNRESTRICTED, 8 kHz STRUCTURED BEARER SERVICE

ICS
CCS
M57
发布
1988
实施

The routing functions are those system functions that are in charge of routing a call attempt toward itsdestination on the basis of the data associated with the call attempt (e.g. the dialled digits, etc.) and the data The routing functions are those system functions that are in charge of routing a call attempt toward its destination on the basis of the data associated with the call attempt (e.g. the dialled digits, etc.) and the data associated to the network (e.g. identities of the circuit sub-groups serving a certain destination, etc.). The destination of a call attempt may be inside the switching system as well as outside the switching system. If the destination is inside the switching systems, the routing will consist of identifying the termination that corresponds to the destination. If the destination is outside the switching system the routing functions shall search for a free circuit, within a given circuit sub-group on which the call attempt will be routed.

ROUTING ADMINISTRATION

ICS
CCS
M57
发布
1988
实施

This specification covers the parts and assembly Cor one type of.connector designated as Connector, Male, Assembly{see 6.1).

CONNECTOR, MALE, ASSEMBLY FOR M18A1 APERS MINE

ICS
CCS
M57
发布
1971-03-19
实施



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