SJ 3178-1988
Technical requirements for iron clad crossbar subscribers telephone switchboards (English Version)

Standard No.

SJ 3178-1988

Language

Chinese, Available in English version

Release Date

1988

Published By

Professional Standard - Electron

Latest

SJ 3178-1988

Scope

This standard applies to mining cross-system user telephone exchanges. Mining vertical and horizontal user telephone exchanges are suitable for production scheduling and internal communication among users in mines, medium and small mines, and are equipped with relay equipment. They can communicate with automatic local telephone bureaus, magnet bureaus, public power bureaus and other switch users. .

SJ 3178-1988 history

• 1988 SJ 3178-1988 Technical requirements for iron clad crossbar subscribers telephone switchboards