GB/T 15840-1995 in English

《GB/T 15840-19954×139 264 kbit/s 光端机技术要求》由339-2（工业和信息化部（通信））归口，主管部门为工业和信息化部（通信）。
本标准规定了我国公用电信网中光缆数字线路系统使用的4×139264kbit/s光端机的技术指标及其功能（包括光、电接口的技术指标，维护使用所需的功能，环境条件等）。是设计和生产4×139264kbit/s光端机的技术依据。本标准适用于长途光缆数字线路系统和市内局间中继光缆通信系统中使用的4×139264kbit/s光端机。

Scope

This standard specifies the technical indicators and functions of 4×139264kbit/s optical transceivers used in the optical cable digital line system in my country's public telecommunication network (including technical indicators of optical and electrical interfaces, functions required for maintenance and use, environmental conditions, etc.). It is the technical basis for designing and producing 4×139264kbit/s optical transceivers. This standard applies to 4×139264kbit/s optical transceivers used in long-distance optical cable digital line systems and inter-city relay optical cable communication systems. The 4×139264kbit/s optical transceiver used in the private telecommunication network can also refer to this standard.