本标准规定了电信路径和空间的要求。注:当前可用服务的多样性，加上不断增加的新服务，意味着可能会出现所需性能受到限制的情况。当将特定应用程序应用于本标准中描述的基础设施时，提醒用户咨询应用程序标准、法规、设备供应商以及系统和服务供应商的适用性、限制和辅助要求。

This standard specifies requirements for telecommunications pathways and spaces.NOTE –The diversity of services currently available, coupled with the continual addition of new services, means that there may be cases where limitations to desired performance occur. When applying specific applications to the infrastructure described in this Standard, the user is cautioned to consult application standards, regulations, equipment vendors, and system and service suppliers for applicability, limitations, and ancillary requirements.