S-91-674-2011-2012

COAXIAL AND COAXIAL/TWISTED PAIR COMPOSITE BURIED SERVICE WIRES TECHNICAL REQUIREMENTS


 

 

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标准号
S-91-674-2011-2012
发布日期
2012年01月17日
实施日期
2012年04月12日
废止日期
中国标准分类号
/
国际标准分类号
/
发布单位
ICEA - Insulated Cable Engineers Association Inc.
引用标准
70
适用范围
This Standard covers mechanical and electrical requirements of service wires containing at least one coaxial core and optionally up to six twisted pairs@ used for service applications to extend the telephone/multimedia circuit from the distribution terminal to the subscriber's station protectedNID (Network Interface Device) or protected NIU (Network Interface Unit). Furthermore@ a distinction between Type I and Type II is made with regard to transmission characteristics and shielding materials of the coaxial unit. Buried Service Wire is used to extend buried telephone plant from the distribution cable to the subscriber. The coaxial unit is intended to be used for either RF or compressed digital video and radio transmissions. This unit shall also allow bi-directional traffic.The coaxial unit should also be capable of carrying high speed digital signals for LAN/WAN applications (such as T1@ ISDN@ etc.) as well as POTS (Plain Old Telephone Services). The network supporting these protocols will be based upon physical lines having a characteristic impedance of 75 Ohms. The coaxial units are specified in three and four common sizes for Type I and Type II respectively@ to accommodate different drop lengths. The twisted pair wires are intended for voice and data transmission and their characteristics are based upon existing system requirements and projected application needs. PURPOSE: The purpose of this Standard is to establish generic technical requirements that may be referenced by individual telecommunications wire specifications covering products intended for buried outside plant use. The parameters covered provide material@ construction@ and performance requirements. Because this Standard does not cover all details of individual wire designs@ it cannot be used as a single document for procurement of product. This Standard is intended to be used in conjunction with an individual product specification that provides complete design details for the specific wire type and designates the applicable performance requirements. Such individual wire specifications may be prepared either by the user or the manufacturer. The specification designated for procurement is at the option of the user.




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