YD/T 868-2007 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| YD/T 868-2007 | English | 130 |
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Technical requirements and measuring methods for additional equipment of telephone set
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| YD/T 868-1996 | English | 319 |
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Technical requirement and test method for digital telephone transmission performances
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YD/T 868-2007: Technical requirements and measuring methods for additional equipment of telephone set
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/YDT868-2007
YD
COMMUNICATIONS INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 33.050.01
M 40
Replacing YD/T 868-1996
Technical requirements and measuring methods for
additional equipment of telephone set
Issued on: APRIL 16, 2007
Implemented on: OCTOBER 1, 2007
Issued by. Ministry of Industry and Information Technology
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms, definitions and abbreviations ... 6
3.1 Terms and definitions ... 6
3.2 Abbreviations ... 6
4 Technical requirements ... 6
4.1 Service conditions ... 6
4.2 Functional requirements ... 6
4.3 Basic technical requirements ... 7
4.4 Environmental test requirements ... 8
4.5 Electromagnetic compatibility requirements ... 9
4.6 Safety requirements ... 9
4.7 Lightning protection requirements ... 9
5 Measuring methods ... 9
5.1 Measuring environment ... 9
5.2 Measuring instruments and equipment... 9
5.3 Test items ... 10
Foreword
This Standard replaces YD/T 868-1996, Technical requirements and measuring
methods for network access of additional equipment of telephone set. Compared with
YD/T 868-1996, the major changes of this Standard are as follows.
-- it changes the name of the standard into “Technical requirements and measuring
methods for additional equipment of telephone set”;
-- it specifies the definitions of additional equipment;
-- it adds reference standards;
-- the addition of additional equipment having the proxy dialing function shall be as
required by YD/T 1361. New requirements are added for additional equipment
having the alarm signal sending function;
-- the addition of additional equipment having the number identification function
shall be as required by YD/T 1277.1. For the measuring methods see the relevant
clauses of YD/T 1277.2;
-- it adds the safety requirements by directly referencing YD/T 965, The safety
requirement and test method for telecommunication terminal equipment;
-- it adds the electromagnetic compatibility requirements by directly referencing
YD/T 968, Limits and methods of measurement of electromagnetic compatibility
for telecommunication terminal equipment;
-- it adds the lightning resistance requirements by directly referencing YD/T 993-
1998, The technical requirements and test methods of overvoltages and
overcurrents resistibility for telecommunication terminal equipment.
The following standards are referenced in the drafting process of this Standard.
GB/T 15279, The specifications of automatic telephone set;
YD/T 965, The safety requirement and test method for telecommunication terminal
equipment;
YD/T 968, Requirements and test methods of electromagnetic compatibility for
telecommunication terminal equipment;
YD/T 993, The technical requirements and test methods of overvoltages and
overcurrents resistibility for telecommunication terminal equipment.
Technical requirements and measuring methods for
additional equipment of telephone set
1 Scope
This Standard specifies the technical requirements and measuring methods for the
additional equipment, including functional requirements, basic technical requirements
and environmental test, electromagnetic compatibility, safety and lightning protection.
This Standard applies to the equipment for the access to the PSTN network, which is
capable of performing the auxiliary functions independently or along with the telephone
set.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrigendum) or revisions do not apply to this Standard, however, parties
who reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
GB/T 15279, The specifications of automatic telephone set
YD/T 965, The safety requirement and test method for telecommunication terminal
equipment
YD/T 968, Limits and methods of measurement of electromagnetic compatibility
for telecommunication terminal equipment
YD/T 993, The technical requirements and test methods of overvoltages and
overcurrents resistibility for telecommunication terminal equipment
YD/T 1277.1, Technical specification and testing method of caller identity delivery
based on PSTN – Part 1. Technical specification
YD/T 1277.2, Technical specification and testing method of caller identity delivery
based on PSTN – Part 2. Testing method
YD/T 1361, Technical requirements and testing methods for telephone dialer
operation of the telephone network and the normal service of the telephone set;
6) the additional equipment, which is connected to an external power supply
(including AC mains and batteries), shall not interfere with the service of the
telephone set in case of any failure of the external power supply;
7) the additional equipment shall be capable of operating normally in case of any
change in the power polarity of the subscriber line;
8) the additional equipment started automatically, shall not do maloperation when
the receiving exchange test signals automatically;
9) the additional equipment shall be capable of operating normally under the
conditions of 0 ~ 5 km of the subscriber line;
10) the additional equipment shall reset automatically after performing a function;
11) the special functions of the additional equipment shall be as specified in relevant
standards.
4.3 Basic technical requirements
1) The DC current absorbed by the additional equipment in the standby condition
from the subscriber line shall not be greater than 25 μA;
2) when the terminal equipment is in the working condition, the DC resistance of the
additional equipment on the subscriber loop shall not be greater than 130 Ω;
3) when the additional equipment operates independently, its DC resistance shall
not be greater than 500 Ω;
4) when the additional equipment is in the standby condition, its AC impedance at
the frequency of 1 000 Hz. |Z| ≥ 10 kΩ;
5) when the additional equipment operates independently or along with the
telephone set, its stable balanced return loss and echo balanced loss shall be as
specified in GB/T 15279;
6) for the additional equipment which has the ringing current testing function, its
ringing current activation sensitivity shall not be greater than 100 mVA;
7) the additional equipment of the dialing limit type is equally effective for pulse and
double audio frequency dialing. When its dialing limit function is activated (e.g.
after the equipment limiting long distance numbers receives a number whose
first digit is 0), all numbers received shall be fully limited. The time of dialing limit
shall not be less than 5 s;
4.5 Electromagnetic compatibility requirements
The electromagnetic compatibility performance of the additional equipment shall be as
specified in YD/T 968.
4.6 Safety requirements
The safety requirements for the additional equipment shall be as specified in YD/T 965.
4.7 Lightning protection requirements
The lightning protection requirements for the additional equipment shall be as specified
in YD/T 993.
5 Measuring methods
5.1 Measuring environment
Environmental temperature. 15°C ~ 35°C;
Relative humidity. 45% ~ 75%;
Atmospheric pressure. 86 ~ 106 kPa;
The noise level around the test site shall not be greater than 55 dB(A).
5.2 Measuring instruments and equipment
1) The requirements for measuring instruments and equipment are the same as
those specified in GB/T 15279.
2) The equivalent network of the AC impedance of the test telephone set is as
shown in Figure 1.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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