ITU-T Q.256

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INTERNATIONAL TELECOMMUNICATION UNION

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TELECOMMUNICATION

STANDARDIZATION SECTOR

OF ITU

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)454Recommendation1

(Extract from the "LUE"OOK)

NOTES

1 ITU-T Recommendation Q.256 was published in Fascicle VI.3 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.

 ITU 1988, 1993

mechanical, including photocopying and microfilm, without permission in writing from the ITU.

Fascicle VI.3 - Rec. Q.256 1

Recommendation Q.256

Fascicle VI.3 - Rec. Q.256

2.3 MANAGEMENT SIGNALS

Signals concerning the management of the speech circuit network and the signalling network. The three

following categories of signals are distinguished:

2.3.1 network-management signals

Information regarding the conditions of circuit groups or equipment sent from one point in the network to one

or more other points. This excludes information relevant to individual calls or individual speech circuits.

2.3.2 network-maintenance signals

Management signals used for maintenance purposes.

2.3.2.1 reset-band signal

A signal sent by a failed exchange during recovery to request that all circuits in the band be put in the idle

state except those circuits at the receiving end that have imposed a blocked condition on the sending end. If at the

receiving end the circuit is blocked, the reset-band signal should remove that condition.

2.3.2.2 reset-band-acknowledgement signal

A signal sent in response to the reset-band signal to indicate whether a circuit is available for use or should be

blocked in the failed exchange.

2.3.2.3 reset-band-acknowledgement signal, all circuits idle

A signal sent in response to the reset-band signal to indicate that all circuits in the band are available for use.

2.3.3 signalling-network-management signals

Information regarding the conditions of signalling links which may be required to modify signal routings. This

excludes information relevant to the signals concerned with individual calls or speech circuits.

2.3.3.1 transfer-prohibited signal

A signal sent by a signal transfer point when it is unable to transfer signals for a particular group of circuits.

2.3.3.2 transfer-allowed signal

A signal sent by a signal transfer point when it is once again ready to transfer signals for the particular group

of circuits.

2.3.3.3 transfer-allowed-acknowledgement signal

A signal sent in response to the reception of a transfer-allowed signal.

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摘要：

ITU-T Q.256是国际电信联盟电信标准化部门（ITU-T）定义的一项关键信令协议标准，全称为“宽带综合业务数字网（B-ISDN）的第二级用户-网络接口（UNI）信令协议”。该标准专注于宽带网络中用户与网络之间的呼叫控制、连接管理及基本服务能力，适用于支持高速数据、视频及多媒体业务的通信环境。ITU-T Q.256作为Q系列协议的核心组成部分，详细规定了在B-ISDN架构下信令消息的格式、流程及交互规范，确保不同厂商设备间兼容性与互操作性。对于从事电信网络规划、协议开发及通信系统集成的工程师

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